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Articles 31 - 60 of 740
Full-Text Articles in Mechanical Engineering
Heat Transfer For Turbulent Annular Flow Of High Prandtl Number Fluids, Benjamin Chung, Lindon Thomas, Yi Pang
Heat Transfer For Turbulent Annular Flow Of High Prandtl Number Fluids, Benjamin Chung, Lindon Thomas, Yi Pang
Yi Pang
Heat transfer for high Prandtl number fluids flowing turbulently in a concentric circular tube annulus with prescribed wall heat flux is investigated analytically. This surface rejuvenation-based analysis is restricted to thermally and hydrodynamically fully developed flow with constant properties and negligible viscous dissipation. This formulation leads to predictions for the Nusselt Number that are in basic agreement with predictions obtained on the basis of earlier eddy diffusivity models for Prandtl number range from 30 to 1000 and Reynolds number range from 10,000 to 1,000,000.
An Analysis Of Heat Transfer In A Turbulent Heat Generating Flow With High Prandtl Numbers, Benjamin Chung, Yi Pang
An Analysis Of Heat Transfer In A Turbulent Heat Generating Flow With High Prandtl Numbers, Benjamin Chung, Yi Pang
Yi Pang
Turbulent heat transfer in a circular tube associated with heat generating fluid of high Prandtl number and wall heat flux is investigated analytically. In the present study, a more comprehensive surface renewal type model, the surface rejuvenation model is employed, which accounts for the fact that turbulent eddies do not generally reach the wall itself. Results of the bulk-to-wall temperature difference on the basis of this model are presented graphically in terms of Reynolds number, Prandtl number and the ratio of wall heat flux to internal heat generation for both cases of heating and cooling. Some limiting solutions are compared …
A Surface Rejuvenation Model For Turbulent Heat Transfer In Annular Flow With High Prandtl Number, Benjamin Chung, Lindon Thomas, Yi Pang
A Surface Rejuvenation Model For Turbulent Heat Transfer In Annular Flow With High Prandtl Number, Benjamin Chung, Lindon Thomas, Yi Pang
Yi Pang
Heat transfer for high Prandtl number fluids flowing turbulently in a concentric circular tube annulus with prescribed wall heat flux is investigated analytically. This surface rejuvenation based analysis is restricted to thermally and hydrodynamically fully developed flow with constant properties and negligible viscous dissipation. This formulation leads to predictions for the Nusselt Number that are in basic agreement with predictions obtained on the basis of earlier eddy diffusivity models for 30 ≤ Pr ≤ 1000 and 104 ≤ Re ≤ 106 .
Experimental And Fem Study Of Thermal Cycling Induced Microcracking In Carbon/Epoxy Triaxial Braided Composites, Chao Zhang, Wieslaw Binienda, Gregory Morscher, Richard Martin, Lee Kohlman
Experimental And Fem Study Of Thermal Cycling Induced Microcracking In Carbon/Epoxy Triaxial Braided Composites, Chao Zhang, Wieslaw Binienda, Gregory Morscher, Richard Martin, Lee Kohlman
Wieslaw K. Binienda
The microcrack distribution and mass change in T700s/PR520 and T700s/3502 carbon/epoxy braided composites exposed to thermal cycling was evaluated experimentally. Acoustic emission was utilized to record the crack initiation and propagation under cyclic thermal loading between −55 °C and 120 °C. Transverse microcrack morphology was investigated using X-ray computed tomography. The differing performance of two kinds of composites was discovered and analyzed. Based on the observations of microcrack formation, a meso-mechanical finite element model was developed to obtain the resultant mechanical properties. The simulation results exhibited a decrease in strength and stiffness with increasing crack density. Strength and stiffness reduction …
Case Study Evaluation Of Saturation And Corridor Enforcement Patrols, Alexander Maistros, William Schneider, Rick Beverly, Brandon Stakleff
Case Study Evaluation Of Saturation And Corridor Enforcement Patrols, Alexander Maistros, William Schneider, Rick Beverly, Brandon Stakleff
William H. Schneider
Alcohol-related crashes in the United States have consistently accounted for roughly 30% of traffic-related fatalities in the past two decades. The combined efforts of researchers, educators, and law enforcement are needed to reduce the number of alcohol-related crashes and fatalities. Saturation patrols and corridor patrols are two tools that law enforcement agencies may use in their continued efforts. In the current economic climate, local law enforcement agencies and coalitions must operate as efficiently as possible. As a case study, this study focused on the patrol efforts of a task force dedicated to reducing operating a vehicle under the influence (OVI) …
Extrinsic Influence Of Environment On The Corrosion Behaviour Of Enamel-Coated Steel Dowel Bars, Srikanth Bajaj, Anil Patnaik, Joe Payer, Robert Liang, Kannan Manigandan, Tirumalai Srivatsan
Extrinsic Influence Of Environment On The Corrosion Behaviour Of Enamel-Coated Steel Dowel Bars, Srikanth Bajaj, Anil Patnaik, Joe Payer, Robert Liang, Kannan Manigandan, Tirumalai Srivatsan
Anil Patnaik
A new type of enamel coated dowel bars for use as concrete pavements has been recently developed and implemented. A gradual deterioration of such bars can occur due to corrosion occurring at locations of the fine microscopic cracks and other defects in the coating. The results of a study aimed at evaluating and understanding the corrosion resistance of such dowel bars is presented and comparisons made with corresponding epoxy-coated dowel bars. Identical defects were introduced onto the surface of the dowel bars with the two types of coatings. The extrinsic influence of environment and resultant corrosion based on type, location …
The Quasi-Static Deformation, Failure, And Fracture Behavior Of Titanium Alloy Gusset Plates Containing Bolt Holes, Therese Hurtuk, Craig Menzemer, Anil Patnaik, Tirumalai Srivatsan, Kannan Manigandan, T. Quick
The Quasi-Static Deformation, Failure, And Fracture Behavior Of Titanium Alloy Gusset Plates Containing Bolt Holes, Therese Hurtuk, Craig Menzemer, Anil Patnaik, Tirumalai Srivatsan, Kannan Manigandan, T. Quick
Anil Patnaik
In this article, the influence of bolt holes, specifically their number and layout on strength, deformation, and final fracture behavior of titanium alloy gusset plates under the influence of an external load is presented and discussed. Several plates having differences in both the number and layout of the bolt holes were precision machined and then deformed under quasi-static loading. The specific influence of number of bolt holes and their layout on maximum load-carrying capability and even fracture load was determined. The conjoint influence of bolt number, bolt layout pattern, nature of loading, contribution from local stress concentration, and intrinsic microstructural …
Investigating And Understanding The Fatigue Response And Failure Of Built-Up Welded Beams Of A Titanium Alloy, Anil Patnaik, Narendra Poondla, Udaykar Bathini, Tirumalai Srivatsan, T. Quick
Investigating And Understanding The Fatigue Response And Failure Of Built-Up Welded Beams Of A Titanium Alloy, Anil Patnaik, Narendra Poondla, Udaykar Bathini, Tirumalai Srivatsan, T. Quick
Anil Patnaik
No abstract provided.
Computations And Detailing Of Pressure Vessels Having Unusual Requirements In Design, Anil Patnaik, Ashenafi Hegana, Tirumalai Srivatsan
Computations And Detailing Of Pressure Vessels Having Unusual Requirements In Design, Anil Patnaik, Ashenafi Hegana, Tirumalai Srivatsan
Anil Patnaik
The provisions of Australian Standard AS 1210-1989 for design and detailing of unfired pressure vessels can be applied to commonly encountered design situations where the shells have small openings. The technique of finite element analysis is a convenient and powerful tool for the purpose of computational stress analysis when the design requirements are such that either the openings are large, or where concentrated loads and/or thermal movements are present. This paper provides a summary of one such practical design of a pressure vessel. While the computational technique using finite element analysis simplifies the stress analysis of pressure vessels considerably, the …
The Bolt Bearing Response And Tensile Deformation Capacity Of Plates Made From A Titanium Alloy, Nicholas Tinl, Craig Menzemer, Anil Patnaik, Tirumalai Srivatsan
The Bolt Bearing Response And Tensile Deformation Capacity Of Plates Made From A Titanium Alloy, Nicholas Tinl, Craig Menzemer, Anil Patnaik, Tirumalai Srivatsan
Anil Patnaik
In this article, the bearing capacity and elongation characteristics of bolt holes in a titanium alloy (i.e., Ti-6Al-4V) deformed in uniaxial tension is presented and discussed. The specific role played by bolt hole confinement on bearing capacity is highlighted. The nature of final fracture is examined and the intrinsic features present on the fracture surface are rationalized in concurrence with macroscopic mechanical response. The behavior of the candidate alloy (Ti-6Al-4V) is compared with conventionally preferred and chosen candidate materials steel and aluminum alloys. An empirical relationship suitable for purpose of structural design is proposed.
A Study Of The Microstructure And Hardness Of Two Titanium Alloys: Commercially Pure And Ti–6al–4v, Narendra Poondla, Tirumalai Srivatsan, Anil Patnaik, M. Petraroli
A Study Of The Microstructure And Hardness Of Two Titanium Alloys: Commercially Pure And Ti–6al–4v, Narendra Poondla, Tirumalai Srivatsan, Anil Patnaik, M. Petraroli
Anil Patnaik
In this paper, the microstructure and hardness of two titanium alloys was determined and the results are presented and briefly discussed. Samples of the alloy for microstructural examination were prepared from the as-provided stock using standard metallographic procedures and then examined in a low magnification light optical microscope. Both microhardness and macrohardness measurements were made across the polished surfaces of the two titanium materials. Both the microhardness and macrohardness of the Ti–6Al–4V alloy was noticeably higher than the commercially pure counterpart. The intrinsic influence of alloy composition and secondary processing, i.e., annealing, on microstructural development is presented and hardness of …
The Cyclic Fatigue And Final Fracture Behavior Of A Titanium Alloy Taken From Weldments: Influence Of Load Ratio And Orientation, Udaykar Bathini, Tirumalai Srivatsan, Anil Patnaik, C. Menzemer, T. Quick
The Cyclic Fatigue And Final Fracture Behavior Of A Titanium Alloy Taken From Weldments: Influence Of Load Ratio And Orientation, Udaykar Bathini, Tirumalai Srivatsan, Anil Patnaik, C. Menzemer, T. Quick
Anil Patnaik
In this paper, the cyclic stress ampliture controlled high cycle fatigue properties...
Understanding The Mechanical Response Of Built-Up Welded Beams Made From Commercially Pure Titanium And A Titanium Alloy, Anil Patnaik, Narendra Poondla, Craig Menzemer, Tirumalai Srivatsan
Understanding The Mechanical Response Of Built-Up Welded Beams Made From Commercially Pure Titanium And A Titanium Alloy, Anil Patnaik, Narendra Poondla, Craig Menzemer, Tirumalai Srivatsan
Anil Patnaik
During the last two decades, titanium has gradually grown in stature, strength and significance to take on the recognition of being a modern and high performance metal that is noticeably stronger and concurrently lighter than the most widely chosen and used steels in a spectrum of industrial applications. Technological innovations have necessitated reduction of part weight, cost and lead time, including concurrent enhancement of performance of structural parts and components made using titanium and its alloys. This has provided the impetus to develop economically viable structural design methodologies and specifications, while at the same time bringing forth innovative and economically …
On The Use Of Gas Metal Arc Welding For Manufacturing Beams Of Commercially Pure Titanium And A Titanium Alloy, Anil Patnaik, Narendra Poondla, Udaykar Bathini, Tirumalai Srivatsan
On The Use Of Gas Metal Arc Welding For Manufacturing Beams Of Commercially Pure Titanium And A Titanium Alloy, Anil Patnaik, Narendra Poondla, Udaykar Bathini, Tirumalai Srivatsan
Anil Patnaik
A noticeable reduction in the cost of structural components made from titanium, both commercially pure and the alloy counterpart is possible with the concept of built-up welded fabrication. Rolled sheets of the titanium material can be welded together to fabricate a built-up structural component without having to machine the part from a large billet. In this paper, the results of a recent feasibility study on the manufacturing of welded built-up I-beams for large structural applications are presented and discussed. The fillet welds were produced using the pulsed Gas Metal Arc Welding (GMAW-P) process. Commercially pure titanium (Grade 2) and a …
Isolating Corrosion Of Steel Plates Coupled With Titanium, Anil Patnaik, X. Shan, M. Adams, T. Srivatsan, Craig Menzemer, Joe Payer
Isolating Corrosion Of Steel Plates Coupled With Titanium, Anil Patnaik, X. Shan, M. Adams, T. Srivatsan, Craig Menzemer, Joe Payer
Anil Patnaik
Over twenty six percent of the bridges in the United States are structurally deficient or functionally obsolete. Corrosion of steel used in structures like bridges and buildings is a problem that has gained increased interest and focused concern. Steel is often the metal that is preferred for use in such applications due to a synergism of ease of availability, acceptable mechanical properties and cost effectiveness. Through the years, titanium has grown in strength, stature and significance to be recognized as an emerging high performance metal that is both stronger and lighter than steel. A distinctive property of titanium and its …
Mechanisms Governing Fatigue, Damage, And Fracture Of Commercially Pure Titanium For Viable Aerospace Applications, Udaykar Bathini, Tirumalai Srivatsan, Anil Patnaik, Craig Menzemer
Mechanisms Governing Fatigue, Damage, And Fracture Of Commercially Pure Titanium For Viable Aerospace Applications, Udaykar Bathini, Tirumalai Srivatsan, Anil Patnaik, Craig Menzemer
Anil Patnaik
In this paper, the cyclic stress amplitude controlled high-cycle fatigue properties and final fracture behavior of commercially pure titanium (Grade 2) are presented and discussed. The material characterization was developed and put forth for selection and use in a spectrum of applications spanning the industries of aerospace, defense, chemical, marine, and commercial products. Test specimens were prepared from the as-received plate stock of the material with the stress axis both parallel (longitudinal) and perpendicular (transverse) to the rolling direction of the plate. The test specimens were cyclically deformed at a constant load ratio of 0.1, at different values of maximum …
Extrinsic Influence Of Environment On The Corrosion Behavior Of Enamel-Coated Steel Dowel Bars, Srikanth Bajaj, Anil Patnaik, Joe Payer, Robert Liang, K. Manigandan, Tirumalai Srivatsan
Extrinsic Influence Of Environment On The Corrosion Behavior Of Enamel-Coated Steel Dowel Bars, Srikanth Bajaj, Anil Patnaik, Joe Payer, Robert Liang, K. Manigandan, Tirumalai Srivatsan
Anil Patnaik
A new type of enamel coated dowel bars for use as concrete pavements has been recently developed and implemented. A gradual deterioration of such bars can occur due to corrosion occurring at locations of the fine microscopic cracks and other defects in the coating. The results of a study aimed at evaluating and understanding the corrosion resistance of such dowel bars is presented and comparisons made with corresponding epoxy-coated dowel bars. Identical defects were introduced onto the surface of the dowel bars with the two types of coatings. The extrinsic influence of environment and resultant corrosion based on type, location …
A Study Of The Tensile Deformation And Fracture Behavior Of Commercially Pure Titanium And Titanium Alloy: Influence Of Orientation And Microstructure, Udaykar Bathini, Tirumalai Srivatsan, Anil Patnaik, T. Quick
A Study Of The Tensile Deformation And Fracture Behavior Of Commercially Pure Titanium And Titanium Alloy: Influence Of Orientation And Microstructure, Udaykar Bathini, Tirumalai Srivatsan, Anil Patnaik, T. Quick
Anil Patnaik
In this paper, the tensile deformation and fracture behavior of commercially pure titanium and the titanium alloy (Ti-6Al-4V) are presented and briefly discussed. Samples of both commercially pure titanium and the Ti-6Al-4V alloy were prepared from the as-provided plate stock along both the longitudinal and transverse orientations. The specimens were then deformed to failure in uniaxial tension. The intrinsic influence of material composition and test specimen orientation on microstructure, tensile properties, and resultant fracture behavior of the two materials is presented. The conjoint influence of intrinsic microstructural features, nature of loading, and specimen orientation on tensile properties of commercially pure …
A Study Of Cyclic Fatigue, Damage Initiation, Damage Propagation, And Fracture Of Welded Titanium Alloy Plate, Tirumalai Srivatsan, Udaykar Bathini, Anil Patnaik, T. Quick
A Study Of Cyclic Fatigue, Damage Initiation, Damage Propagation, And Fracture Of Welded Titanium Alloy Plate, Tirumalai Srivatsan, Udaykar Bathini, Anil Patnaik, T. Quick
Anil Patnaik
In this paper, the influence of test specimen orientation and microstructure on cyclic stress-amplitude controlled fatigue response, damage initiation, damage propagation and fracture behavior of samples taken from a welded plate of titanium alloy is presented and discussed. Test specimens from the chosen alloy were prepared from an as-welded plate of the material with the stress axis both parallel (longitudinal) and perpendicular (transverse) to the deformed (rolling) direction of the plate. The test specimens were cyclically deformed at different values of maximum stress at a constant load ratio of 0.1, and the resultant cycles-to-failure was recorded. The fracture surfaces of …
The Fatigue Behavior Of Built-Up Welded Beams Of Commercially Pure Titanium, Anil Patnaik, Narendra Poondla, Udaykar Poondla, Tirumalai Srivatsan
The Fatigue Behavior Of Built-Up Welded Beams Of Commercially Pure Titanium, Anil Patnaik, Narendra Poondla, Udaykar Poondla, Tirumalai Srivatsan
Anil Patnaik
In this article, the results of a recent study aimed at evaluating, understanding, and rationalizing the extrinsic influence of fatigue loading on the response characteristics of built-up welded beams made from commercially pure titanium (Grade 2) are presented and discussed. The beams were made from welding plates and sheets of titanium using the pulsed gas metal arc welding technique to form a structural beam having an I-shaped cross section. The welds made for the test beams of the chosen metal were fillet welds using a matching titanium filler metal wire. The maximum and minimum load values at which the built-up …
Extrinsic Influence Of Environment On The Corrosion Behaviour Of Enamel-Coated Steel Dowel Bars, Srikanth Bajaj, Anil Patnaik, Joe Payer, Robert Liang, Kannan Manigandan, Tirumalai Srivatsan
Extrinsic Influence Of Environment On The Corrosion Behaviour Of Enamel-Coated Steel Dowel Bars, Srikanth Bajaj, Anil Patnaik, Joe Payer, Robert Liang, Kannan Manigandan, Tirumalai Srivatsan
Robert Y. Liang
A new type of enamel coated dowel bars for use as concrete pavements has been recently developed and implemented. A gradual deterioration of such bars can occur due to corrosion occurring at locations of the fine microscopic cracks and other defects in the coating. The results of a study aimed at evaluating and understanding the corrosion resistance of such dowel bars is presented and comparisons made with corresponding epoxy-coated dowel bars. Identical defects were introduced onto the surface of the dowel bars with the two types of coatings. The extrinsic influence of environment and resultant corrosion based on type, location …
Extrinsic Influence Of Environment On The Corrosion Behavior Of Enamel-Coated Steel Dowel Bars, Srikanth Bajaj, Anil Patnaik, Joe Payer, Robert Liang, K. Manigandan, Tirumalai Srivatsan
Extrinsic Influence Of Environment On The Corrosion Behavior Of Enamel-Coated Steel Dowel Bars, Srikanth Bajaj, Anil Patnaik, Joe Payer, Robert Liang, K. Manigandan, Tirumalai Srivatsan
Robert Y. Liang
A new type of enamel coated dowel bars for use as concrete pavements has been recently developed and implemented. A gradual deterioration of such bars can occur due to corrosion occurring at locations of the fine microscopic cracks and other defects in the coating. The results of a study aimed at evaluating and understanding the corrosion resistance of such dowel bars is presented and comparisons made with corresponding epoxy-coated dowel bars. Identical defects were introduced onto the surface of the dowel bars with the two types of coatings. The extrinsic influence of environment and resultant corrosion based on type, location …
Correlation Of Polysiloxane Molecular Structure To Shear-Thinning Power-Law Exponent Using Elastohydrodynamic Film Thickness Measurements, Thomas Zolper, Paul Shiller, Gary Doll, Manfred Jungk, Tobin Marks, Yip Chung, Aaron Greco, Babak Dehkordi, Qian Wang
Correlation Of Polysiloxane Molecular Structure To Shear-Thinning Power-Law Exponent Using Elastohydrodynamic Film Thickness Measurements, Thomas Zolper, Paul Shiller, Gary Doll, Manfred Jungk, Tobin Marks, Yip Chung, Aaron Greco, Babak Dehkordi, Qian Wang
Gary L. Doll
Siloxane-based polymers (polysiloxanes) are susceptible to temporary shear-thinning that manifests as a reduction of elastohydrodynamic film thickness with increasing entrainment speed or effective shear rate. The departure from Newtonian film thickness can be predicted with the power-law exponent ns, an indicator of the severity of shear-thinning in a polymeric fluid that is influenced by the macromolecular structure. In this paper, a combination of extant rheological and tribological models is applied to determine the power-law exponent of several polysiloxanes using film thickness measurements. Film thickness data at several temperatures and slide-to-roll ratios are used to validate the methodology for several siloxane-based …
Frequency Division Multiplexing Of A Multi-Channel Resistive Pulse Sensor, Ashish Jagtiani, Jiang Zhe, Joan Carletta
Frequency Division Multiplexing Of A Multi-Channel Resistive Pulse Sensor, Ashish Jagtiani, Jiang Zhe, Joan Carletta
Joan Carletta
We present the design, fabrication and testing of a microfluidic multichannel resistive pulse sensor for high throughput counting of microparticles. The high throughput counting results from using multiple parallel microfluidic channels to analyze the sample. Detection is achieved by using frequency division multiplexing where a known and unique frequency is applied to modulate each microchannel and a combined measurement is made across a single pair of electrodes. Testing results using 30μm polystyrene particles demonstrate that the throughput of the multiplexed device is improved 300% over a single channel device. In addition, the AC modulation method reduces the polarization effect on …
Capacitive Coulter Counting: Detection Of Metal Wear Particles In Lubricant Using A Microfluidic Device, Srinidhi Murali, Xingao Xia, Ashish Jagtiani, Joan Carletta, Jiang Zhe
Capacitive Coulter Counting: Detection Of Metal Wear Particles In Lubricant Using A Microfluidic Device, Srinidhi Murali, Xingao Xia, Ashish Jagtiani, Joan Carletta, Jiang Zhe
Joan Carletta
A microfluidic device based on the capacitance Coulter counting principle to detect metal debris particles in lubricant oil is presented. The device scans each individual metal debris particle as they pass through a microfluidic channel by monitoring the capacitance change. We first proved the feasibility of using the capacitance Coulter counting principle for detecting metal particles in a fluidic channel. Next, we tested the microfluidic device with aluminum abrasive particles ranging from 10 to 25 µm; the testing results show the microfluidic device is capable of detecting metal wear particles in low-conductive lubricant oil. The design concept demonstrated here can …
A Microfluidic Multichannel Resistive Pulse Sensor Using Frequency Division Multiplexing For High Throughput Counting Of Micro Particles, Ashish Jagtiani, Joan Carletta, Jiang Zhe
A Microfluidic Multichannel Resistive Pulse Sensor Using Frequency Division Multiplexing For High Throughput Counting Of Micro Particles, Ashish Jagtiani, Joan Carletta, Jiang Zhe
Joan Carletta
In this work we demonstrate an on-chip multiplexed multichannel resistive pulse sensor (Coulter counter) for high throughput counting of microscale particles. The design, fabrication and testing of this device are presented. The high throughput counting is a result of using multiple parallel microfluidic channels to analyze the sample. Detection is achieved by using frequency division multiplexing; each microchannel is modulated with its own known and unique frequency, a combined measurement is made across a single pair of electrodes, and the measured signal is demodulated to determine the signal across each individual channel. Testing results using 30 µm polystyrene particles demonstrate …
Metal Wear Detection Apparatus And Method Employing Microfluidic Electronic Device, Jiang Zhe, Li Du, Joan Carletta, Robert Veillette
Metal Wear Detection Apparatus And Method Employing Microfluidic Electronic Device, Jiang Zhe, Li Du, Joan Carletta, Robert Veillette
Joan Carletta
An apparatus and a method for detection of wear particles in a lubricant are disclosed. The apparatus includes a microfluidic device including a microchannel sized for a lubricant containing wear particles to pass therethrough and first and second electrodes extending into the microchannel. A detection system is coupled with the electrodes for detection of wear particles passing through the microchannel, based on a change in capacitance of the electrodes.
Detection And Counting Of Micro Scale Particles And Pollen Using A Multi-Aperture Coulter Counter, Ashish Jagtiani, Jiang Zhe, Jun Hu, Joan Carletta
Detection And Counting Of Micro Scale Particles And Pollen Using A Multi-Aperture Coulter Counter, Ashish Jagtiani, Jiang Zhe, Jun Hu, Joan Carletta
Joan Carletta
We demonstrate a high throughput, all-electronic Coulter-type sensor with four sensing microapertures to detect and count micro-scale particles. Four particle samples are utilized for this study: polymethacrylate particles 40 µm and 20 µm in diameter, Juniper Scopulorum (Rocky Mountain Juniper) pollen and Cottonwood pollen particles. The two types of pollen particles are roughly 20 µm in diameter. The particles are mixed with deionized water and forced to pass through the microapertures. Voltage pulses across all four apertures are recorded and analysed. Results demonstrate that the sensor can detect and count particles through its four sensing apertures simultaneously. Thus, the counting …
An Impedimetric Approach For Accurate Particle Sizing Using A Micro Coulter Counter, Ashish Jagtiani, Joan Carletta, Jiang Zhe
An Impedimetric Approach For Accurate Particle Sizing Using A Micro Coulter Counter, Ashish Jagtiani, Joan Carletta, Jiang Zhe
Joan Carletta
In this paper, we present the design, impedimetric characterization and testing of a microfabricated Coulter counter for particle size measurement that uses a pair of thin film coplanar Au/Ti electrodes. An electrical equivalent circuit model of the designed device is analyzed. Accurate measurement of particle size was achieved by operating the device at a frequency for which the overall impedance is dominated by the channel resistance. A combination of design features, including the use of a pair of sensing electrodes with a surface area of 100 µm by 435 µm, a spacing of 1785 µm between the two sensing electrodes …
A Micromachined High Throughput Coulter Counter For Bioparticle Detection And Counting, Jiang Zhe, Ashish Jagtiani, Prashanta Dutta, Jun Hu, Joan Carletta
A Micromachined High Throughput Coulter Counter For Bioparticle Detection And Counting, Jiang Zhe, Ashish Jagtiani, Prashanta Dutta, Jun Hu, Joan Carletta
Joan Carletta
We describe a micromachined Coulter counter with multiple sensing microchannels for quantitative measurement of polymethacrylate particles and pollen. A unique design with sensing microelectrodes in the center of the microchannels is demonstrated. This design creates isolation resistances among channels, and thus circumvents the crosstalk caused by automatic electrical connection among microchannels. When implemented using microfluidic channels, this design is appropriate for the sensing of microscale particles in deionized water or in dilute electrolyte solution. Our design has multiple channels operating in parallel, but integrated with just one sample reservoir and one power source. The results with a four-channel device show …