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- Adsorption<br />Lubrication and lubricants -- Testing<br />Permeability (1)
- Chemical process control -- Simulation methods<br />Distillation apparatus (1)
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- Diffusion<br />Diffusion -- Mathematical models<br />Solution (Chemistry) (1)
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- Unsteady flow (Fluid dynamics)<br />Unsteady flow (Fluid dynamics) -- Computer programs<br />Aquifers<br />Pressure -- Mathematical models (1)
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Articles 1 - 13 of 13
Full-Text Articles in Engineering
Determination Of Molecular Diffusivities In Liquids, Pai-Chuan Wu
Determination Of Molecular Diffusivities In Liquids, Pai-Chuan Wu
Masters Theses
"A porous plate, initially at a uniform solute concentration is immersed in a well-stirred pure solvent bath of known volume. It is desired to find the molecular diffusivity of the solute-solvent system by observing the change of the solute concentration in the solvent bath with time. In this study, concentration-time data were curve-fitted by non-linear, least squares techniques to the various mathematical solutions describing molecular diffusion in the porous frit. This technique is used to determine the diffusion coefficient and predict the value of other parameters existing in the different mathematical diffusion models. The results from the different models are …
Prediction Of Drag Reduction With A Viscoelastic Model, Gary Kent Patterson, J. L. Zakin
Prediction Of Drag Reduction With A Viscoelastic Model, Gary Kent Patterson, J. L. Zakin
Chemical and Biochemical Engineering Faculty Research & Creative Works
No abstract provided.
Numerical Differentiation Of Equally Spaced And Not Equally Spaced Experimental Data [3], Harry C. Hershey, Jacques L. Zakin
Numerical Differentiation Of Equally Spaced And Not Equally Spaced Experimental Data [3], Harry C. Hershey, Jacques L. Zakin
Chemical and Biochemical Engineering Faculty Research & Creative Works
No abstract provided.
A Study Of The Anodic Oxidation Of Ethylene On Gold And Gold-Platinum Alloys, San-Cheng Lai
A Study Of The Anodic Oxidation Of Ethylene On Gold And Gold-Platinum Alloys, San-Cheng Lai
Doctoral Dissertations
"The distinctive features of electrochemical energy conversion is the direct conversion of the chemical energy of a reaction into electrical energy without going through the intermediary of heat, thereby avoiding the Carnot limitation. Since it is theoretically possible to obtain electrical energy to the extent of the free energy change of the chemical reaction, the overall thermal efficiencies expected are nearly 100 percent. However, the observed efficiencies of most electrochemical energy converters are considerably lower than this due to a slowness of one or more of the intermediate steps of the overall reaction. There has been a recent surge of …
Liquid Extraction With Single Droplets-Effect Of Chemical Reaction, William Victor Andoe
Liquid Extraction With Single Droplets-Effect Of Chemical Reaction, William Victor Andoe
Doctoral Dissertations
"The circulating drop mass transport model based on Hadamard's dispersed phase stream function was solved numerically to account for a solute diffusing into a droplet and undergoing a first order irreversible reaction with the drop medium for the case where the continuous phase resistance to solute transport is negligible ... Experimental data were obtained for a system which consisted of 2-chloro-2-methylpropane (t-butyl chloride) diffusing from a benzene continuous phase into falling water droplets and undergoing a first order irreversible reaction with the water droplets ... The experimental solute transport rates were a factor of 7 to 10 greater than those …
Permeability And Additive Sorption And Extraction In Lubricating Greases, Chan-Shan Fan
Permeability And Additive Sorption And Extraction In Lubricating Greases, Chan-Shan Fan
Masters Theses
"The effect of the area and type of surface of ten silica thickeners and aluminum oxide on grease permeability, on the sorption of PAN [Phenyl-α-naphthylamine] by the grease, and on subsequent extraction were studied. For grease containing 6% per cent of thickener, permeability coefficients varied from 20.1 x 10⁻¹¹ cm² to 168 x 10⁻¹¹ cm². For each silica type they decreased with increase in surface area of the thickener. The level of the permeability coefficient is generally related to the worked penetration. In sorption measurements using permeating oils of varying PAN concentration, the amount of PAN associated with the thickener …
Diffusion Coefficients Of D-Glucose In Aqueous Carboxymethylcellulose And Carboxypolymethylene Solutions, Audrey Liu-Mei Huang
Diffusion Coefficients Of D-Glucose In Aqueous Carboxymethylcellulose And Carboxypolymethylene Solutions, Audrey Liu-Mei Huang
Masters Theses
"A microinterferometric method was used to determine the concentration profiles in the infinite field unsteady state diffusion of D-Glucose in aqueous polymer solutions. Pseudo binary diffusion coefficients were determined as a function of reduced concentration both with and without the effect of liquid volume change during diffusion being considered. The systems studied were D-Glucose in aqueous Carboxymethylcellulose and D-Glucose in aqueous Carboxypolymethylene solutions. Solute concentration ranged from nearly zero to about 9% by weight D-Glucose in the aqueous polymer solutions"--Abstract, page ii.
Estimation Of Film Boiling Heat Transfer Coefficients For Cylindrical Heaters In Corresponding States Fluids, Gary Joseph Capone
Estimation Of Film Boiling Heat Transfer Coefficients For Cylindrical Heaters In Corresponding States Fluids, Gary Joseph Capone
Masters Theses
"An investigation of film boiling heat transfer was made with cylindrical heaters. The (0.75" O.D.) gold plated, copper heaters were positioned horizontally in pools of liquid argon, nitrogen, and carbon monoxide. A correlation for film boiling corresponding states fluids is derived and discussed. The correlation is a least squares fit of three variables: the diameter of the cylindrical heater, the reduced pressure of the system, and the temperature difference between the heater surface and the saturated pool"--Abstract, page iii.
Sufficiency Conditions For Constrained Optima, Cheng-Chun Huang
Sufficiency Conditions For Constrained Optima, Cheng-Chun Huang
Masters Theses
"The sufficiency conditions for constrained optimization problems are derived through the use of Lagrangian functions and through the introduction of the new concept of "constrained total derivatives." The relations can be used with equality and/or inequality constraints. The sufficiency conditions derived earlier by Phipps were corrected in this work--Abstract, page ii.
A Numerical Simulation Of Pressure Distribution And Radius Of Drainage In Infinite Radial Aquifers - Constant Rate Case, Alton John Nute
A Numerical Simulation Of Pressure Distribution And Radius Of Drainage In Infinite Radial Aquifers - Constant Rate Case, Alton John Nute
Doctoral Dissertations
"The diffusivity equation for the transient flow of slightly-compressible liquids has been solved for infinite radial aquifers, subject to constant terminal rates, by employing a Romberg integration of the Van Everdingen - Hurst explicitly solution over the transformed integral limits for .01̲TD>500, the classical solutions presented by Carslaw and Jaeger, Mortada, Theis, and others are incorporated in the digital analysis to yield dimensionless pressures for 40 selected dimensionless radius (RD) ratios between 1 and 64 for dimensionless time values of .0005 to 1000.0. A new expression for dimensionless pressure-distribution, PD'(RD, TD), as a fraction of well bore pressure drop …
A Study Of Porous Membrane Evaporation For Desalination In A Flow System, Jing Ming Lee
A Study Of Porous Membrane Evaporation For Desalination In A Flow System, Jing Ming Lee
Masters Theses
"The purpose of this investigation was to study the simultaneous mass and heat transfer mechanism in evaporation through a porous membrane with a non-wettable surface. Such water repellent membranes permit the passage of water vapor, but not liquid water. The investigation concerned the mass transfer rate through the membrane pores with flow on one or both sides of the membrane. The water-repellent membrane separated a hot salt solution from the fresh water, and a copper sheet separated the fresh water from a cold salt solution. A three-channel evaporator-condenser was used, and the membrane consisted of glass fiber paper treated with …
The Effect Of Polymer Structure On Drag Reduction In Nonpolar Solvents, Gin Chain Liaw
The Effect Of Polymer Structure On Drag Reduction In Nonpolar Solvents, Gin Chain Liaw
Doctoral Dissertations
"The effects of polymer chain flexibility, molecular weight and entanglement capacity, and of polymer solution concentration on drag reduction in nonpolar solvents were studied in this investigation. Three samples of polydimethyl siloxane in toluene, five samples of polyethylene oxide in benzene, two samples of cis-polyisoprene in toluene, trans-polyisoprene in toluene, cis-polybutadiene in toluene, ethyl cellulose in toluene and a copolymer of epichlorohydrin and polyethylene oxide in toluene were studied. Molecular weights of all polymers were estimated from intrinsic viscosity, except for the molecular weight of the copolymer which was given by the manufacturer. Turbulent and laminar flow pressure drop data …
Distillation Column Simulation And Control, Hsian T. Chao
Distillation Column Simulation And Control, Hsian T. Chao
Masters Theses
"A 5-component, 10-stage distillation column was simulated by PACTOLUS by use of the hybrid technique. It was found that the digital-analog simulator is completely satisfactory for solving unsteady-state multicomponent distillation problems. A feedforward controller for a distillation column was designed and tested. The effects of feedforward and feedback control on binary system distillation columns were compared by PACTOLUS. It was found that the liquid flow rates, the holdups as well as the number of stages are important factors in the design of a feedforward controller"--Abstract, page ii.