ISSN:0001-1541    

DOI:10.1002/aic.690120302

出版商:American Institute of Chemical Engineers    

年代:1966

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690120307

出版商:American Institute of Chemical Engineers    

年代:1966

数据来源: WILEY

摘要:

AbstractPrevious studies of the effect of surface active agents on the stability of falling liquid films indicated that surface elasticity was primarily responsible for the observed stabilizing action. Since the elastic nature of a surface is thought to be controlled by interface and interfacial mass transport, it is of interest to understand how these transport rates affect the stability of the liquid film. The analysis for both soluble and insoluble surface active agents is presented in terms of a perturbation solution of the Orr‐Sommerfeld equatio

ISSN:0001-1541    

DOI:10.1002/aic.690120308

出版商:American Institute of Chemical Engineers    

年代:1966

数据来源: WILEY

摘要:

AbstractThe degree of separation effected by a fractionator can be measured by a fractionation indexn. The index is the equivalent number of theoretical plates, operating at total reflux, which would effect the same component separation as the fractionator.The value of the fractionation index is readily calculated from the Fenske‐Underwood equation when component analyses of the feed and products are available.In the case of crude oils, the number of components is so great that resolution in the laboratory is not practicable, and the feed and products are customarily analyzed by high efficiency laboratory fractionators which give their true boiling point characteristics. In this form, the data have been broken down into short fractions which have then been treated as pseudo components in subsequent column calculations.This paper presents a method for treating the product TBP curves as algebraic functions without the necessity for breaking the feed TBP data into arbitrary short fractions. The fractionation index can be derived directly from product TBP data, or the TBP data can be calculated when the fractionation index is known.Data from performance tests on three commercial units have been analyzed. The TBP distillation analyses of the crude oils and the products enabled the fractionation indices pertaining to each section of the fractionators to be evaluate

ISSN:0001-1541    

DOI:10.1002/aic.690120309

出版商:American Institute of Chemical Engineers    

年代:1966

数据来源: WILEY

摘要:

AbstractAn extension to annular conduits of the well‐known method of calculating the resistance coefficient for turbulent flow in circular pipes is presented. The method is new in that it does not borrow any information from laminar flow theory; it gives, therefore, a location for the maximum velocity based only on turbulent flow characteristics. Expressions and a few essential graphs are given for the average as well as inner‐ and outer‐wall resistance coefficients for both hydraulically smooth and rough regimes and also for the transitional regime. A comparison with available experimental information for fully developed turbulent flow is pres

ISSN:0001-1541    

DOI:10.1002/aic.690120310

出版商:American Institute of Chemical Engineers    

年代:1966

数据来源: WILEY

摘要:

AbstractThe presence of gravity‐capillary waves at the surface of a viscous falling film has been studied theoretically by a more rigorous linear treatment than presently available.The present analysis is based on the assumption of steady state periodic solutions of the complete Navier‐Stokes equations. It provides methods of prediction, to a first order of approximation, for the wavelength, celerity, and wave number, in terms of the Weber number which emerges as the governing dimensionless group. This treatment includes as special cases the low Weber number analyses of Yih, Benjamin, Hanratty and Hershman, and Kapitza, as well as the high Weber number theory of Ishihara, Iwagaki, and Iwasa. Agreement with experimental observation is improved over that obtained from previous analyses.The stream function of the system has been derived and the instantaneous streamlines have been constructed for application to heat and mass trans

ISSN:0001-1541    

DOI:10.1002/aic.690120311

出版商:American Institute of Chemical Engineers    

年代:1966

数据来源: WILEY

摘要:

AbstractPrevious results for a class of flows dynamically possible in a Noll simple fluid are the starting point for a description of melt spinning or dry spinning in the limit of a rapidly extruded, small diameter polymer thread. Simultaneous energy and mass transfer, important in the real process, are not taken into account; also neglected are inertial effects, body forces, and surface tension.

ISSN:0001-1541    

DOI:10.1002/aic.690120312

出版商:American Institute of Chemical Engineers    

年代:1966

数据来源: WILEY

摘要:

AbstractThe change in volume on mixing for a system showing large positive deviations from ideality is examined at one temperature to pressures of 100,000 lb./sq.in. Original atmospheric pressure density data and compression measurements over the entire mole fraction range for this system, acetone–carbon disulfide, are reported at 0°C. These are correlated with the semiempirical Tait equation to yield change in volume on mixing as a function of mole fraction and pressure.This volume change is found to decrease from the maximum of 1 cc./mole at atmospheric pressure to about 0.4 cc./mole at 100,000 lb./sq.in. The maximum also shifts during this pressure increase from 0.53 mole fraction acetone to 0.

ISSN:0001-1541    

DOI:10.1002/aic.690120313

出版商:American Institute of Chemical Engineers    

年代:1966

数据来源: WILEY

摘要:

AbstractIsothermal pressure elevation can sometimes cause liquid‐liquid phase separation of binary liquid mixtures. A quantitative thermodynamic analysis of this effect is made and applied to the system acetone–carbon disulfide at 0°C. with the use of available P‐V‐T‐X data and vapor pressure data at low pressure. Visual observations of the phase separations at pressures up to 80,000 lb./sq.in. were used to compare with the results of the thermodynami

ISSN:0001-1541    

DOI:10.1002/aic.690120314

出版商:American Institute of Chemical Engineers    

年代:1966

数据来源: WILEY

摘要:

AbstractAxial mixing was measured in both phases for a countercurrently operated, mechanically agitated extractor of the Oldshue‐Rushton design for water continuous and toluene and kerosene dispersed. Results in terms of an eddy axial diffusivity were correlated in terms of the variables studied. These correlations were then applied to column performance during extraction ofn‐butyl amine from kerosene into water, and the true mass transfer coefficients, corrected for axial mixing, were determined. These are shown to be predictable for droplets of dispersed phase considered to be rigid sphe

ISSN:0001-1541    

DOI:10.1002/aic.690120315

出版商:American Institute of Chemical Engineers    

年代:1966

数据来源: WILEY