摘要:

AbstractThe behaviors of several diffusion coefficients are shown for the methane‐n‐butane system under conditions such that solutions are very nonideal and the concentrations of both components are significant. The coefficient proposed by Chapman and Cowling shows the least variation with state and is recommended for use under such conditions in hydrocarbon systems. Several other coefficients commonly used show large variations with state and coefficients using concentrations as a potential are even negative in certain regi

ISSN:0001-1541    

DOI:10.1002/aic.690110113

出版商:American Institute of Chemical Engineers    

年代:1965

数据来源: WILEY

摘要:

AbstractThe diffusion of carbon dioxide through ethanol‐water, benzene toluene, and carbon tetrachloride benzene was studied over the entire range of compositions for the solvent pairs. The results were interpreted in terms of an effective binary diffusion coefficient. Two semiempirical correlations were derived with the aid of absolute reaction rate theory to predict the effective binary diffusion coefficient from the binary diffusion coefficients of the solute in the individual pure solvents. These equations, although only crude approximations, reproduced the experimental data for six diffusion systems fairly well, including the highly nonideal solvent mixture ethanol‐wa

ISSN:0001-1541    

DOI:10.1002/aic.690110114

出版商:American Institute of Chemical Engineers    

年代:1965

数据来源: WILEY

摘要:

AbstractExperimental equipment to study the film boiling of liquid nitrogen on a porous heat source with vapor suction was developed. The electrically heated element was a 3.69 in. sintered stainless steel screen, which was also used as a resistance thermometer in conjunction with an a.c. potentiometric circuit. In preliminary work, this mode of heat transfer was unstable, but stability was achieved by placing a porous flow control element on the liquid side of the heater. It was found that the Nusselt number was a function of only the Reynolds number; the heat transfer coefficient was increased by a factor of as much as 2.5 over the heat transfer coefficient in normal film boiling; it was possible to vary independently any two of the three variables, heat flux, flow rate through the plate, and temperature difference; and the generated vapor was considerably superheated. Fluctuations in the local surface temperature were measured in film boiling from both porous and nonporous flat plates, indicating that momentary solid‐liquid contacts can occur, for all practical purposes, in film boilin

ISSN:0001-1541    

DOI:10.1002/aic.690110115

出版商:American Institute of Chemical Engineers    

年代:1965

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690110116

出版商:American Institute of Chemical Engineers    

年代:1965

数据来源: WILEY

摘要:

AbstractHigh intensity sound was investigates as a means for liquid breakup. Sonic generators provided energy to atomize liquid introduced near the sound source. Droplet size was measured at several conditions of air and liquid flow for sound intensities ranging up to 160 decibels.Atomization was good at low liquid flows but became rahter coarse as flow rate increased. The droplet size distributions were not uniform. No improvement in breakup could be attributed directly to the sonic compressions and rarefactions beyond that normally produced by the tearing action of air in conventional two‐fluid atomizers at comparable air/liquid ratio

ISSN:0001-1541    

DOI:10.1002/aic.690110117

出版商:American Institute of Chemical Engineers    

年代:1965

数据来源: WILEY

摘要:

AbstractStudies of the air oxidation of aquoeus sodium sulfite solutions were made in simple bubble contacting columns of 3‐, 4‐, and 6‐in. diameter. Superficial gas rates up to 300 lb./hr.‐sq.ft. were used. Contacting action is described in detail, and comparisons with air‐water data show the marked influence of small, ionic bubbles. Mass transfer and dynamic gas holdup data are presented, and the former are compared with mass transfer data for bubble

ISSN:0001-1541    

DOI:10.1002/aic.690110118

出版商:American Institute of Chemical Engineers    

年代:1965

数据来源: WILEY

摘要:

AbstractThe decomposition of iron pentacarbonyl at pressures between one and 400 Torr was studied from 120° to 300°C. Up to about 200°C. the rate was primarily limited by surface kinetics of adsorbed carbonyl. Gas phase diffusional resistances were controlling at higher temperatures. In the kinetically controlled region the deposition rate was correlated by a Langmuir type of equation. Corrections for diffusion resistances in the kinetic region and kinetic resistances in the diffusion region were found to be appreciab

ISSN:0001-1541    

DOI:10.1002/aic.690110119

出版商:American Institute of Chemical Engineers    

年代:1965

数据来源: WILEY

摘要:

AbstractAn analysis of the stability of a packed‐bed reactor is presented subject to a model including axial and radial gradients in the interparticle field and gradients plus reaction in the intraparticle field. The stability of the entire reactor is characterized in terms of various stable and unstable conditions inside the porous particles. Simplifications in the mathematical model are shown to be invalid in many situation

ISSN:0001-1541    

DOI:10.1002/aic.690110120

出版商:American Institute of Chemical Engineers    

年代:1965

数据来源: WILEY

摘要:

AbstractThe experimental procedure for determining the initial hydrate formation conditions along the univariant gas‐water rich liquid‐hydrate locus through the measurement of equilibrium pressures and temperatures alone in a constant volume system has been successfully applied to several binary gas mixtures with water to pressures as high as 15,000 lb./sq. in.The general hydrate theory of van der Waals and Platteeuw, after appropriate modifications, was found valid for the accurate prediction of the initial hydrate formation conditions for selected mixtures of argon‐methane and argon‐nitrogen.The calculated methane‐argon compositions in the hydrate phase are presented as a function of the methane‐argon composition in the gas phase on a water‐free basis but were not verified e

ISSN:0001-1541    

DOI:10.1002/aic.690110121

出版商:American Institute of Chemical Engineers    

年代:1965

数据来源: WILEY

摘要:

AbstractStability criteria are formulated for displacement of a fluid from an infinite porous medium by a second more dense fluid miscible with the fluid being displaced. Pure displacing fluid is separated from pure displaced fluid by a region of constant thickness in which the two fluids interpenetrate. The steady displacement process takes place at a constant velocity in the direction of gravity. It is shown that appreciable differences in pure‐component densities, viscosity variation within the zone of interpenetration, and the displacement velocity can have a major effect on the stability criteria of such a flo

ISSN:0001-1541    

DOI:10.1002/aic.690110122

出版商:American Institute of Chemical Engineers    

年代:1965

数据来源: WILEY