ISSN:0001-1541    

DOI:10.1002/aic.690070443

出版商:American Institute of Chemical Engineers    

年代:1961

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690070436

出版商:American Institute of Chemical Engineers    

年代:1961

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690070437

出版商:American Institute of Chemical Engineers    

年代:1961

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690070402

出版商:American Institute of Chemical Engineers    

年代:1961

数据来源: WILEY

摘要:

AbstractThis paper presents an extension of the corresponding states principle to mixtures of low molecular weight, nonpolar gases at low temperatures. It corrects the corresponding states principle for quantum mechanical effects but neglects any deviation from Maxwell‐Boltzmann statistics. A comparison is made between compressibility factors obtained from reduced second‐virial coefficients and those obtained from pseudo‐critical values. The use of reduced virial coefficients is limited by the fact that there are not enough experimental data to permit extensive correlations of third‐virial coefficients. The pseudo‐critical expressions derived for higher temperatures are accurate at cryogenic temperatures provided the reference substance chosen has a molecular weight close to that of the mixture as well as a similar molecu

ISSN:0001-1541    

DOI:10.1002/aic.690070403

出版商:American Institute of Chemical Engineers    

年代:1961

数据来源: WILEY

摘要:

AbstractThe presence of vortex motion in a vertical cylinder in which water is passed upward can result in three types of velocity profiles: net upward motion at all points in the tube, an ascending outer annulus and a descending central core, and outer annulus and central core ascending and an intermediate annulus descending.All three types of velocity profiles are functions of three factors: the tangential velocity, the manner of decay of the tangential velocity, and the wall pressure drop. A fourth factor, boundarylayer growth, is proposed to explain the third type of profile. Experimental work was carried out to prove the mechanisms proposed for the first two types of profiles. Photographic observations were taken showing the existence of the third type.

ISSN:0001-1541    

DOI:10.1002/aic.690070404

出版商:American Institute of Chemical Engineers    

年代:1961

数据来源: WILEY

摘要:

AbstractWaves at an interface between a concurrent air‐water flow cause an increase in the interfacial stress. This increase in stress is correlated with the root‐mean‐square displacement of the liquid from its average height. The data are compared with Nikuradse's measurements with sand roug

ISSN:0001-1541    

DOI:10.1002/aic.690070405

出版商:American Institute of Chemical Engineers    

年代:1961

数据来源: WILEY

摘要:

AbstractThe effect of design and operational variables on the performance of one type of hydrogen‐oxygen ion exchange membrane fuel cell has been studied. Only the results of cells based on a phenolsulfonic acid formaldehyde type of ion exchange membrane containing one type of reinforcement are described. Platinum, palladium, iridium, and rhodium are adequate electrode materials for room‐temperature operation. Performance of cells with platinum gauze current collectors bonded to the cell surfaces was only slightly better than that with external contacts about 1 cm. apart.Open circuit voltages range from 0.9 to 1.1 v. (theoretical 1.23) depending on the catalyst. The typical current at 0.5 v. is 30 ma./sq. cm. Better cells have delivered 80 ma./sq. cm. at 0.5 v. Life tests indicate that these cells can be expected to deliver a minimum of about 40 amp.‐hr./sq. cm., when operated in the load range 8.5 to 230 ohm sq. cm., before failure of the electrolyte owing to pinhole formation. Current efficiency is very nearly 100%. Cell performance vs. temperature in the range 0° to 85°C. shows a maximum at abo

ISSN:0001-1541    

DOI:10.1002/aic.690070406

出版商:American Institute of Chemical Engineers    

年代:1961

数据来源: WILEY

摘要:

AbstractAs the primary phase in the development of multicomponent mass transfer theory, equations are derived which predict the rate of mass transfer of each species from an interface to a ternary gas mixture in turbulent flow for equimolal‐countercurrent transfer and for transfer with one of the three gases stagnant.The mass transfer equations obtained, regardless of whether a film, Prandtl‐Taylor, or modified Chilton‐Colburn model is used, differ in form from the usual binary equations and predict qualitative as well as large quantitative differences between binary and ternary transfer.A criterion is obtained which any consistent multicomponent mass transfer theory must satisfy, and although the ternary film and Prandtl‐Taylor models satisfy this criterion, the modified ternary Chilton‐Colburn model

ISSN:0001-1541    

DOI:10.1002/aic.690070407

出版商:American Institute of Chemical Engineers    

年代:1961

数据来源: WILEY

摘要:

AbstractMeasurements have been made of the simultaneous rates of transfer of acetone and benzene between a liquid film and a turbulent three component gas mixture. The measurements were made in a wetted‐wall column with both mixtures of acetone, benzene and nitrogen, and acetone, benzene and helium.As predicted by the equations of Part I the mass transfer differs qualitatively as well as quantitatively from mass transfer in the corresponding binary system in which one component is stagnant. In several experiments acetone was transferred from low to high concentrations in accord with the predictions.Both the ternary film and Prandtl‐Taylor models satisfactorily predict the rates of transfer of acetone and benzene, and, except possibly for very high Reynolds numbers, the simpler film model is recommen

ISSN:0001-1541    

DOI:10.1002/aic.690070408

出版商:American Institute of Chemical Engineers    

年代:1961

数据来源: WILEY