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Articles 1 - 19 of 19
Full-Text Articles in Engineering
Measuring Solid–Liquid Interfacial Energy Fields: Diffusion-Limited Patterns, Martin E. Glicksman
Measuring Solid–Liquid Interfacial Energy Fields: Diffusion-Limited Patterns, Martin E. Glicksman
Mechanical and Civil Engineering Faculty Publications
The Leibniz–Reynolds transport theorem yields an omnimetric interface energy balance, i.e., one valid over all continuum length scales. The transport theorem, moreover, indicates that solid–liquid interfaces support capillary-mediated redistributions of energy capable of modulating an interface’s motion—a thermodynamic phenomenon not captured by Stefan balances that exclude capillarity. Capillary energy fields affect interfacial dynamics on scales from about 10 nm to several mm. These mesoscopic fields were studied using entropy density multiphase-field simulations. Energy rate distributions were exposed and measured by simulating equilibrated solid–liquid interfaces configured as stationary grain boundary grooves (GBGs). Negative rates of energy distributed over GBGs were measured …
Pressure Swing Adsorption Separation Of H2s/Co2/Ch4 Gas Mixtures With Molecular Sieves 4a, 5a, And 13x, Howell H. Heck, Merilyn L. Hall, Rudy Dos Santos, Manolis M. Tomadakis
Pressure Swing Adsorption Separation Of H2s/Co2/Ch4 Gas Mixtures With Molecular Sieves 4a, 5a, And 13x, Howell H. Heck, Merilyn L. Hall, Rudy Dos Santos, Manolis M. Tomadakis
Mechanical and Civil Engineering Faculty Publications
Pressure swing adsorption experiments were carried out for the separation of equimolar mixtures of carbon dioxide and methane containing small amounts of hydrogen sulfide, utilizing 4A, 5A, and 13X molecular sieves. High-purity methane of zero or nearly zero hydrogen sulfide concentration was produced in the adsorption stage with 13X and 5A sieves, at high product recovery rates; high-purity carbon dioxide was obtained with the same sieves in the desorption stage. Zeolite 4A was found capable of raising considerably the hydrogen sulfide concentration in the accumulated desorption product (vs. the adsorption feed) at high recovery rates too. Adsorption selectivity values derived …
Comparative Analysis Of Designing Solar And Geothermal Power Plants: A Case Study, Roberto Venegas, Sarada Kuravi, Krishna Kota, Mary Helen Mccay
Comparative Analysis Of Designing Solar And Geothermal Power Plants: A Case Study, Roberto Venegas, Sarada Kuravi, Krishna Kota, Mary Helen Mccay
Mechanical and Civil Engineering Faculty Publications
Geothermal and solar thermal are renewable, clean energy sources with immense potential for electricity generation. Concentrating Solar Power can achieve very high temperatures and high efficiencies compared to geothermal power plants. However, it is intermittent and must be coupled with thermal storage or another source for continuous power generation. Geothermal resources exist in varying temperatures but are too small for economic power production; however, it is not intermittent. This paper briefly summarizes the location-specific design considerations for geothermal and solar thermal plants. The performance of both these types of power plants is analysed in terms of capacity factor, thermal energy …
Development Of Product Recyclability Index Utilizing Design For Assembly And Disassembly Principles, Darshan P. Yadav, Deep N. Patel, Beshoy W. Morkos
Development Of Product Recyclability Index Utilizing Design For Assembly And Disassembly Principles, Darshan P. Yadav, Deep N. Patel, Beshoy W. Morkos
Mechanical and Civil Engineering Faculty Publications
Designing products for recyclability is driven by environmental and economic goals. Several design for assembly (DFA) rules and parameters can be used to gauge the recyclability index of product designs. These indices can be used for comparative analysis of the recyclability of different products. This assists the designer in making design choices related to the product's end of life. However, many of the existing recyclability indices are only available after design and manufacturing decisions are made. If such design decisions could be made earlier in the design process, when the design space is less bound, recyclability could be considered earlier. …
Two-Stage Concrete As A Sustainable Production, Hakim Salem Abdelgader, Ali Said Ahmed El-Baden, H. A. Abdurrahman, A. S.M. Abdul Awal
Two-Stage Concrete As A Sustainable Production, Hakim Salem Abdelgader, Ali Said Ahmed El-Baden, H. A. Abdurrahman, A. S.M. Abdul Awal
Mechanical and Civil Engineering Faculty Publications
Two-stage concrete (TSC) is a sustainable concrete which is produced by forcing a flowable cement grout mixture through the voids of a skeletal mass made of compacted preplaced aggregates. From the technical and economic aspects, TSC is particularly useful for construction and repair of concrete structures especially foundations, underwater construction, nuclear reactors, concrete dams, heritage structures and in constructions with closely spaced reinforcement. TSC differs from ordinary concrete in that it contains a higher proportion of stone aggregate and the aggregate stays in point-to-point contact as placed. Thus, the mechanical characteristics of the TSC in failure conditions are distinctly different …
Evaluation Of Elastic Modulus Of Fiber-Reinforced Concrete, Nakin Suksawang, Salam Wtaife, Ahmed Alsabbagh
Evaluation Of Elastic Modulus Of Fiber-Reinforced Concrete, Nakin Suksawang, Salam Wtaife, Ahmed Alsabbagh
Mechanical and Civil Engineering Faculty Publications
This paper determines the effect of discrete fibers on the elastic modulus of concrete and cement composites. Five types of discrete fibers consisting of steel, polypropylene, macro-polyolefin, polyvinyl alcohol (PVA), and basalt fibers were investigated. Results show that discrete fibers had little effect on elastic modulus for fiber-reinforced concrete (FRC) with coarse-to-fine aggregate ratio (C/S) greater than 1. However, for FRC with C/S smaller than 1 and fiber-reinforced cement composites (FRCCs), discrete fibers reduced the elastic modulus. Accordingly, a new elastic modulus equation is proposed to better estimate the elastic modulus of FRC with a maximum fiber volume fraction of …
Anomalous Decay Of Nanomechanical Modes Going Through Nonlinear Resonance, Oriel Shoshani, Steven W. Shaw, Mark I. Dykman
Anomalous Decay Of Nanomechanical Modes Going Through Nonlinear Resonance, Oriel Shoshani, Steven W. Shaw, Mark I. Dykman
Mechanical and Civil Engineering Faculty Publications
Because of the small size of nanomechanical systems, their vibrations become nonlinear already for small amplitudes. Many nontrivial aspects of the vibration dynamics arise from the coexistence of several nonlinearly coupled modes. We show that such coupling can lead to anomalous decay of the modes where they go through nonlinear resonance, so that their amplitude-dependent frequencies become commensurate. We demonstrate the possibility of a strongly nonmonotonic dependence of the decay rate on the amplitude if one of the modes serves as a thermal reservoir for another mode. Where the decay of both modes is slow compared to the rate of …
Estimation Of Submarine Groundwater Discharge Into The Indian River Lagoon, Ashok Pandit, N. Ali, H. Heck, K. Mamoua
Estimation Of Submarine Groundwater Discharge Into The Indian River Lagoon, Ashok Pandit, N. Ali, H. Heck, K. Mamoua
Mechanical and Civil Engineering Faculty Publications
A calibrated and validated finite difference numerical model was used to estimate the spatial and temporal distribution of the Meteoric Groundwater Discharge (MGWD) and Submarine Groundwater Discharge (SGD) into a coasted estuary known as the Indian River Lagoon (IRL) at two transects. Specifically, this paper describes the methodology used to determine: a) the quantity of MGWD originating from the mainland and the barrier island, b) the spatial distribution of the SGD into the IRL, c) the groundwater salinity and hydraulic head distribution below the IRL, and d) the regional flow directions of the MGWD and the Oceanic Groundwater Discharge (OGWD) …
Modeling Long-Term Deformations Of Unbound Pavement Materials Using The Miniaturized Pressuremeter Creep Data, A. M. Shaban, P. J. Consentino
Modeling Long-Term Deformations Of Unbound Pavement Materials Using The Miniaturized Pressuremeter Creep Data, A. M. Shaban, P. J. Consentino
Mechanical and Civil Engineering Faculty Publications
This research was undertaken to study the predictive capability of the pressuremeter test for characterizing in situ creep behavior of unbound pavement layers. Although the creep potential of granular pavement materials is less pronounced than fine-grained soils, consideration of actual creep deformations in the pavement evaluation process will improve long-term pavement performance. In this investigation, the long-term deformations determined from laboratory one-dimensional creep tests were compared with those investigated by field pressuremeter tests. The pressuremeter test consisted of inflating a cylindrical probe incrementally up to a given stress level, and then maintaining the pressure constant for a 5-min single stage. …
Damping Of Seismic Vibrations Of A 3d Asymmetrical Building Model With Multiple Tmd’S, Jean-Paul Pinelli, Kai Chen, Hector Gutierrez, Rasvan Rusovici
Damping Of Seismic Vibrations Of A 3d Asymmetrical Building Model With Multiple Tmd’S, Jean-Paul Pinelli, Kai Chen, Hector Gutierrez, Rasvan Rusovici
Mechanical and Civil Engineering Faculty Publications
In this paper, the authors investigate the control of the seismic response of a three dimensional asymmetrical tier-building model, with a combination of three tuned mass dampers (TMD) located on the upper floor of the building. The 3D frame model represents a 3-story steel building designed for the SAC project in Los Angeles, California. All the dynamic analyses of the 3D structure are performed in ANSYS. The frequencies of the three TMD's and excitations are tuned to the appropriate fundamental frequencies of the model. The optimal number and location of the TMD's on the top floor are investigated, to reduce …
Pencel Pressuremeter Testing To Determining P-Y Curves For Laterally Loaded Deep Foundations, Messaoud Farid, Nouaouria Md Salah, Paul J. Cosentino
Pencel Pressuremeter Testing To Determining P-Y Curves For Laterally Loaded Deep Foundations, Messaoud Farid, Nouaouria Md Salah, Paul J. Cosentino
Mechanical and Civil Engineering Faculty Publications
The pressuremeter used was essentially the PENCEL pressuremeter (PPMT), manufactured by ROCTEST, Inc. This paper offers a description of the equipment, testing procedure, theory to obtain parameters of the ground and to develop the p-y curves for laterally loaded piles. From PPMT data reduced to graphs of pressure versus volume, soil parameters including the lift-off pressure, the initial elastic and reload moduli, and the limit pressure were determined. Methods developed to determine p-y curves from pressuremeter and dilatometer (DMT) test. P-y curves are used in the analysis to represent lateral soil-pile interaction. The pressuremeter offers an almost ideal in-situ modelling …
Work-Of-Indentation As A Means To Characterize Indenter Geometry And Load-Displacement Response Of A Material, Kaushal K. Jha, Shuo Zhang, Nakin Suksawang, Ton-Lo Wang, Arvind Agarwal
Work-Of-Indentation As A Means To Characterize Indenter Geometry And Load-Displacement Response Of A Material, Kaushal K. Jha, Shuo Zhang, Nakin Suksawang, Ton-Lo Wang, Arvind Agarwal
Mechanical and Civil Engineering Faculty Publications
Normalized indentation works, referred to as the total and elastic energy constants, have been shown to be effective in the representation and analysis of experimental load-displacement data. However, their physical meaning, influencing factors, variation range and relationships with other nanomechanical quantities are not precisely known. In this study, the load-displacement data obtained as a result of simulations of elastic and elastoplastic indentations are extensively analyzed to enhance our understanding concerning these two energy based parameters. It has been shown that while the total energy constant describes the state of an indenter tip and the type of contact regime, the elastic …
Capillary-Mediated Dendritic Branching, Martin E. Glicksman
Capillary-Mediated Dendritic Branching, Martin E. Glicksman
Mechanical and Civil Engineering Faculty Publications
We consider the Gibbs-Thomson temperature distribution as an active interface energy field with gradients and fluxes. Capillarity in conventional dendritic growth theories acts only as a passive boundary condition on the transport field that conducts latent heat into the melt to drive the solidification. Instead, we find the vector divergence of capillary-mediated interface fluxes autonomously releases or withdraws energy along a curved solid-liquid interface. Local energy conservation (a Stefan balance) shows that capillary-mediated energy slightly retards, or enhances, the local freezing rate. At special points near the tip where the capillary-mediated energy release changes sign, the surface Laplacian of the …
Road Surface Mirage: A Bunch Of Hot Air?, Zhou Huaichun, Huang Zhifeng, Cheng Qiang, Lu Wei, Qiu Kui, Chen Chen, Hsu Pei-Feng
Road Surface Mirage: A Bunch Of Hot Air?, Zhou Huaichun, Huang Zhifeng, Cheng Qiang, Lu Wei, Qiu Kui, Chen Chen, Hsu Pei-Feng
Mechanical and Civil Engineering Faculty Publications
The inferior mirage from road surfaces is a common phenomenon, which can be easily seen in everyday life. It has been recognized in the literature as a light refraction phenomenon due to the refractive index gradient caused by the temperature gradient in the air strata above the road surfaces. However, it was also suggested that the mirage is just a phenomenon of specular reflection at grazing incidence. Because of the lack of reasonable and quantitative evidence, the generally accepted light refraction theory has not yet been refuted. Here we show some mirror-like reflection images captured from a road surface stretch …
Simulation And Thermodynamic Analysis Of Extended Expansion On A Concept Rotary Engine Including Its Effects On Fuel Efficiency, Denis Allemant Andre, Matthew James Jensen, Gerald Micklow, James Brenner, Helgevon Helldorff
Simulation And Thermodynamic Analysis Of Extended Expansion On A Concept Rotary Engine Including Its Effects On Fuel Efficiency, Denis Allemant Andre, Matthew James Jensen, Gerald Micklow, James Brenner, Helgevon Helldorff
Mechanical and Civil Engineering Faculty Publications
This paper describes a novel method for extended expansion in a rotary combustion engine running ordinary gasoline. The engine consists of a toroidal-shaped piston that rotates around a drum to expand and evacuate the hot gas. There are several problems with today’s internal combustion (IC) engines. Current IC engines do not always have the necessary internal volume to extract the maximum work possible, and since the whole process of compression, combustion, and expansion happen within the same space, excess heat builds up and increases emissions of nitric oxides and nitrogen dioxide. The proposed solution is to redesign the IC engine …
Influence Of Optical Fiber Coating Damage In The Light Transmissivity Characteristics Of Microbend Sensors, Franz Campero, Paul J. Cosentino, David C. Fleming, Edward H. Kalajian, Barry G. Grossman
Influence Of Optical Fiber Coating Damage In The Light Transmissivity Characteristics Of Microbend Sensors, Franz Campero, Paul J. Cosentino, David C. Fleming, Edward H. Kalajian, Barry G. Grossman
Mechanical and Civil Engineering Faculty Publications
A laboratory testing and engineering modeling study was completed to determine the influence of fiber optic coating damage caused by microbend contact on the performance of microbend sensors developed based on relatively low cost single-sided microbending technique using a multimode optical fiber. A testing method was designed, developed and implemented to determine the loads that caused optical fiber glass-coating debonding and coating fracture. Finite Element models of the fiber-deformer system were developed to study the failure modes and predict the stresses that caused this failure. Loads and displacements predicted by Finite Element models were found to be in good agreement …
Transmission Characteristics Of An Alloptical- Waveguide Biomedical System For X-Ray Delivery, Ronald W. Waynant, Ilko K. Ilev, Kunal Mitra, Israel Gannot, Robert J. Jennings
Transmission Characteristics Of An Alloptical- Waveguide Biomedical System For X-Ray Delivery, Ronald W. Waynant, Ilko K. Ilev, Kunal Mitra, Israel Gannot, Robert J. Jennings
Mechanical and Civil Engineering Faculty Publications
We have investigated the transmission characteristics of an alternative all-optical-waveguide system for x-ray delivery to a precise tissue area. The delivery system includes two basic optical elements: a funnel-shaped uncoated hollow glass taper and a flexible hollow delivery waveguide. The hollow taper provides direct launching of the input x-ray radiation into a delivery waveguide. It is an uncoated glass taper whose operating principle is based on the grazing-incidence effect. We investigated both experimentally and theoretically how the transmission properties of the hollow taper depend on its geometrical parameters such as cone shape, length, input and output core diameters. The x-ray-source-to-taper …
Volumetric Exchanges Between A Managed Marsh And A Coastal Estuary, Ashok Pandit, John H. White, Antonis A. Kakoullis, Satish B. Akula, James R. David
Volumetric Exchanges Between A Managed Marsh And A Coastal Estuary, Ashok Pandit, John H. White, Antonis A. Kakoullis, Satish B. Akula, James R. David
Mechanical and Civil Engineering Faculty Publications
The dominant term in the estimation of net flux calculation, between a marsh and a source of tidal water is often the exchange of water. The purpose of this study was to provide a description of the methodology used to estimate the volumetric exchange of surface waters between a managed marsh and the Indian River Lagoon during the managed and unmanaged periods. The paper also documents the simplifying assumptions that had to be made to estimate the exchanges both during the managed and unmanaged period. These assumptions had to be made either because the data were limited mainly due to …
Groundwater Seepage Into The Indian River Lagoon At Port St Lucie, Ashok Pandit, Clovis Clovis El-Khazen
Groundwater Seepage Into The Indian River Lagoon At Port St Lucie, Ashok Pandit, Clovis Clovis El-Khazen
Mechanical and Civil Engineering Faculty Publications
A finite element program, GROSEEP, was developed to estimate the groundwater seepage from the surficial aquifer into Indian River lagoon along a selected cross-section in Port St. Lucie, Florida. The model is a general purpose model and can be used at other cross-sections. Model results using a single layer indicate that groundwater seepage could be an important freshwater source into the lagoon. Sensitivity analysis using a three-layer model predicted that among other parameters the presence of windows in the clay layers could significantly affect seepage rates into the lagoon.