摘要:

AbstractThe Chemical Engineering Progress Symposium Series is composed of papers on specific subjects conveniently bound in individual books, which are published at intervals. The books are 8½ by 11 inches, paper covered, and cost $4.00 to members, $6.00 to nonmembers for “Heat Transfer—Buffalo,” No. 32. They may be ordered from the Secretary's Office, the American Institute of Chemical Engineers, 345 East 47 Street, New York 17, New York.TheA.I.Ch.E. Journalwill publish, from time to time, abstracts of the articles appearing in the Symposium Series volumes. Recently published volumes are abstracted

ISSN:0001-1541    

DOI:10.1002/aic.690070341

出版商:American Institute of Chemical Engineers    

年代:1961

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690070342

出版商:American Institute of Chemical Engineers    

年代:1961

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690070343

出版商:American Institute of Chemical Engineers    

年代:1961

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690070302

出版商:American Institute of Chemical Engineers    

年代:1961

数据来源: WILEY

摘要:

AbstractThe investigation was concerned with measuring growth rates of bubbles in an isothermal medium where growth is controlled by mass diffusion. The conditions were met by generating hydrogen bubbles at a platinum cathode during the electrolysis of water. Growth data were obtained by motion picture photography at 800 to 2,400 frames/sec. taken through a microscope to produce an enlargement of 30X on the film.Growth took place in 0.1 normal and 1.0 normal sulfuric acid in water at 77°F. Current densities between 0.1 and 0.2 amp./sq. cm. were used. The observed diameters were all less than 0.006 in., and the growth times were less than 2 sec. Beside growth phenomena interesting features recorded included the coalescence of bubbles, the jumping of bubbles off the solid and then back again, and the slip of the bubble contact at the solid surface.Some bubbles grew with their radii proportional to the square root of time as predicted theoretically by Scriven. For these bubbles the calculated supersaturation of hydrogen in the solution was found to be from eight to twenty‐four times the concentration at saturati

ISSN:0001-1541    

DOI:10.1002/aic.690070303

出版商:American Institute of Chemical Engineers    

年代:1961

数据来源: WILEY

摘要:

AbstractA correlation has been developed interrelating entrainment as a function of plate spacing, weir height, hole size, liquid rate, and gas rate with a section of a 30‐in. diameter column and the air‐water system. The correlation is empirical, but approximately 90% of the over 900 points of data fall within ± 25% of the correlation. Hole diameters of 1/16 to 1/4 in., weir heights from 0 to 2 in., plate spacing from 12 to 24 in., gas rates from 770 to 1,700 lb./hr./sq. ft., and liquid rates from 2,800 to 12,000 lb./hr./ft. of weir length were studied as variable. Entrainment was found to increase with gas rate, decrease with weir height, increase with hole size, decrease with plate spacing, and could increase or decrease because of interaction effects as the liquid rate incre

ISSN:0001-1541    

DOI:10.1002/aic.690070304

出版商:American Institute of Chemical Engineers    

年代:1961

数据来源: WILEY

摘要:

AbstractA finite‐difference method is presented for solving three‐dimensional transient heat conduction problems. The method is a modification of the method of Douglas and Rachford which achieves the higher‐order accuracy of a Crank‐Nicholson formulation while preserving the advantages of the Douglas‐Rachford method: unconditional stability and simplicity of solving the equations at each time level. Although the method has not yet been applied, the analysis in this paper suggests that it will prove to be the most efficient method yet proposed for the numerical integration of three‐dimensional transient heat conducti

ISSN:0001-1541    

DOI:10.1002/aic.690070305

出版商:American Institute of Chemical Engineers    

年代:1961

数据来源: WILEY

摘要:

AbstractA recirculation type of apparatus with a novel liquid‐sampling system was used to obtain liquid‐vapor equilibrium data for the hydrogen‐nitrogen and deuterium‐nitrogen systems at 90° and 95°K. and pressures up to 1,000 lb./sq. in. abs. The data obtained show an average scatter in liquid compositions of the order of 0.01%, thus proving the feasibility of the new liquid‐sampling system. The vapor samples are shown by thermodynamic analysis to scatter less than 0.1%. Deuterium is slightly more soluble in liquid nitrogen than hydrogen; the relative volatility is 1.198 at 90°K. and about 1.177 at 95°K. The relative volatility is practically independent of pressure; thus at 90°K. the relative volatility decreases from 1.198 at 100 lb./sq. in. abs. to 1.196 at 1,000 lb./sq. in. abs., but this range of values is well within the expe

ISSN:0001-1541    

DOI:10.1002/aic.690070306

出版商:American Institute of Chemical Engineers    

年代:1961

数据来源: WILEY

摘要:

AbstractA process is considered in which the inputs to the system are stationary random ergodic functions. From the spectral densitities of the inputs and cross‐spectral densities of inputs and outputs a local linearized model of the process is obtained through the transfer function. There results then a maximum problem involving an objective function and constraints imposed by the model and the physical and arbitrary restraining conditions. Two special cases are solved in detail in which the maximum problem reduces to a linear programing problem. Other methods are needed for the general proble

ISSN:0001-1541    

DOI:10.1002/aic.690070307

出版商:American Institute of Chemical Engineers    

年代:1961

数据来源: WILEY

摘要:

AbstractBasic gas dynamic equations involving suspended solid particles were formulated. Considerations include momentum and heat transfer between the gaseous and solid phases. Significance of these contributions was illustrated with the case of expansion through a de Laval nozzle. Duct flow and normal shock problems were also discussed. The extent of earlier methods of approximation was pointed out.

ISSN:0001-1541    

DOI:10.1002/aic.690070308

出版商:American Institute of Chemical Engineers    

年代:1961

数据来源: WILEY