摘要:

AbstractAn analysis was made of the rate of heat transfer by convection, radiation, and chemical reaction to a dispersion of particles in a non‐absorbing gas. The gas‐solids suspension was subjected to co‐gravitational flow at low Reynolds Numbers (50–500) through a cylindrical reactor, the wall of which was maintained at a uniform temperature (400–900°C). The rate of heat transfer by convection from the wall to the gas was determined experimentally. The differential equations were solved on an IBM‐650 digital computer, for the reduction of iron oxide particles (40 to 100 microns) by hydrogen. The program output recorded the particle residence time and corresponding values of gas and particle temperatures, length of reactor travelled, percent reduction, and individual rates of heat transfer to the particle by convection, radiation and chemical reaction. Experimental measurements in an electrically‐heated, 4.4‐in. i.d. × 8.5 ft. long stainless steel reactor verified the calculated prediction that the particle temperature should at all time be nearly equal t

ISSN:0008-4034    

DOI:10.1002/cjce.5450410103

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1963

数据来源: WILEY

摘要:

AbstractNew data were obtained for absorption of carbon dioxide from an air‐carbon dioxide mixture by aqueous ammonia solutions in a tower packed with 1/2 in. Raschig rings. The rates of absorption of carbon dioxide, expressed as over‐all volumetric coefficientsKGa, were correlated with the ammonia concentration and the liquid flow rate.The data were analyzed in the light of the film, penetration and Kishinevsky theories for absorption with simultaneous chemical reaction. Effective interfacial areas, calculated from the data with the aid of the first two theories, were reasonable, and three to four times larger than the corresponding areas for pure physical absorption or vaporization under the same hydrodynamic conditions. Distinction between the two theories was not possible because, for the present system, both give nearly the same results. Results from Kishinevsky's theory were quite unreasona

ISSN:0008-4034    

DOI:10.1002/cjce.5450410104

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1963

数据来源: WILEY

摘要:

AbstractLiquid‐vapor equilibrium data at 750 mm. Hg are given for the four binary systemsCH3OH+CH2Cl2,n‐C5H12+CH2Cl2,n‐C5H12+CH3OHandn‐C5H12+n‐C6H14. The second and third of these systems have been shown previously to exhibit the phenomenon of non‐filmwise condensation, and the equilibrium data are used in the following paper to calculate (condensing) film coefficients for the liquid and vapor films. The first three systems are azeotropic, and the compositions and boiling points (at 750 mm. Hg) of the minimum‐boiling azeotropes are given.Densities have also been measured for the systemn‐C5H12+CH3OHat 25°C. and refractive indices at 25°C. for the other three systems. The calculated volume of mixing forn‐C5H12+CH3OHis positive at all compositions. A geometrical interpretation of this is discussed in comparison with results previously obtained for solutions of alcohols and c

ISSN:0008-4034    

DOI:10.1002/cjce.5450410105

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1963

数据来源: WILEY

ISSN:0008-4034    

DOI:10.1002/cjce.5450410106

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1963

数据来源: WILEY

摘要:

AbstractData are reported on phase inversion in concentrated oil‐water mixtures dispersed in a fully‐baffled stirred tank. The results indicate that water continuous dispersions in which the water concentration is as small as 40% by volume can be formed.For a vertically centered impeller the concentration of the organic liquid required for phase inversion varies inversely with the rate of energy input. The effect of impeller position is also discus

ISSN:0008-4034    

DOI:10.1002/cjce.5450410107

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1963

数据来源: WILEY

摘要:

AbstractThe enthalpy change upon vaporization of l‐pentene was experimentally determined by calorimetric measurements at temperatures between 100° and 280°F. The results are in good agreement with available data at the lower temperatures and are presented in graphical and tabular f

ISSN:0008-4034    

DOI:10.1002/cjce.5450410108

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1963

数据来源: WILEY

摘要:

AbstractVapor‐liquid equilibrium data at atmospheric pressure are reported for the systems: 2‐butanone‐2‐propanol, chloroform‐2‐propanol, ethyl acetate‐2‐butanone, and methyl acetate‐2‐propanol. The experimental results are correlated by two typical method

ISSN:0008-4034    

DOI:10.1002/cjce.5450410109

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1963

数据来源: WILEY

摘要:

AbstractViscosity data for slurries of five solid particle systems suspended in a mineral oil are presented for solid concentrations up to 50% by volume. At volume concentrations of less than 30% the results are well represented by the Einstein equation in its fluidity form, the constant varying with the system between 2.65 and 3.15, (as compared with 2.5 in the theoretical equation). At higher concentrations the slurries are non‐Newtonian, and no satisfactory correlation is available in this region, very little complete data for the high concentration region have been published.Slurry viscosities are greater for smaller particles, and are greater for irregular particles than for spherical particles. Slurry viscosities in regions of high concentration can be considerably reduced by careful selection of particle size distribution.Pressure gradients measured in an experimental pipeline carrying a suspension of coal in oil in laminar flow could not have been predicted using the viscosities determined in the laborator

ISSN:0008-4034    

DOI:10.1002/cjce.5450410110

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1963

数据来源: WILEY

摘要:

AbstractEquations are derived for the transient activity of flow medium in multistage continuous flow reactors. Activity behavior of linear, exponential, and step change is considered. Complete mixing in each stage is assumed. Application to a fluidized bed reactor is presented and a method of obtaining mixing coefficients is given.

ISSN:0008-4034    

DOI:10.1002/cjce.5450410111

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1963

数据来源: WILEY

摘要:

AbstractThe rate of sedimentation of precipitated calcium carbonate in water was measured as a function of the solid concentration and the shape and angle of inclination of the container. It was found that an experimentally determined coefficient had to be included in the settling equation proposed by Nakamura to make it fit the data.

ISSN:0008-4034    

DOI:10.1002/cjce.5450410112

出版商:Wiley Subscription Services, Inc., A Wiley Company    

年代:1963

数据来源: WILEY