摘要:

AbstractConvective heat and mass transfer rates for 20 shapes suspended in various orientations in a hot turbulent air stream were correlated by the equation:\documentclass{article}\pagestyle{empty}\begin{document}$$ j'_{\,\,D} = 0.692\left({Re''} \right)^{ - 0.486} \,{\rm for}\,500\, < \,{Re}''\, < \,5000 $$\end{document}for turbulent intensities between 9 and 10%, using a new characteristic dimension,L”, in the Reynolds Number. This dimension, defined as the total surface area divided by the maximum perimeter perpendicular to flow, was qualitatively explained from boundary layer considerations and was found to correlate the data for different shapes available in the literature. Qualitative pictures for the relative rates of heat and mass transfer around the various shapes were also obtaine

ISSN:0008-4034    

DOI:10.1002/cjce.5450380202

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

年代:1960

数据来源: WILEY

摘要:

AbstractFluidization tests on pure silver and silver catalyst powder show that agglomeration occurs when the bed is heated, which finally results in bed collapse at a comparatively low temperature. If the bed temperature is held constant in the agglomerating temperature range, an induction period is observed before fluidization ceases. A study of the induction period as a function of temperature (10–60°C.) leads to an activation energy of 18 kcal. for the overall agglomeration process for pure silver. Agglomeration is believed to be due to sinteri

ISSN:0008-4034    

DOI:10.1002/cjce.5450380203

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

年代:1960

数据来源: WILEY

摘要:

AbstractA method is described for the determination of tie‐lines in ternary liquid systems which may be used when a satisfactory method of chemical analysis is unavailable. The technique is graphical and is based upon the lever rule principle. The method is illustrated with the system acetic acid‐furfural‐water at 25 ± 0.05°. Results indicate the method is accurate and capable of good pr

ISSN:0008-4034    

DOI:10.1002/cjce.5450380204

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

年代:1960

数据来源: WILEY

摘要:

AbstractA review of recent work on transient stagewise mass transfer processes is presented, with particular emphasis on numerical and analog solutions for the partial differential difference equations involved. The numerical or analog solutions are relatively simple, whereas the analytical solution even of the linearized equation is quite involved.An example of gas absorption is considered in which the equations are linearized, and solved numerically as well as by the use of a resistance network analog. These particular methods of solution had not previously been used for this problem, and the present work is compared with previous solutions. The novel feature of the method of solution is the representation of the time derivative by a backward finite difference to produce a set of simultaneous algebraic equations, which may be solved most easily by matrix inversion programmed on a digital computer.

ISSN:0008-4034    

DOI:10.1002/cjce.5450380205

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

年代:1960

数据来源: WILEY

摘要:

AbstractTwo aluminum soaps have been prepared as hydrocarbon gelling agents. The aluminum soap of 2‐ethylhexanoic acid (Octal) was successfully prepared by a pilot plant continuous process which utilized a flash mixer. Optimum process conditions and the effect of important process variables were determined. There was a seasonal cycle of short gelling times and low gel consistencies in the summer months and high results in the winter. The cause of the cycle is not known.Aluminum isooctanoate (Isooctal) was prepared continuously and batchwise on both a laboratory and pilot plant scale. The continuously prepared products were not satisfactory. Good Isooctals were prepared batchwise and pilot plant results were the same as those obtained in the laboratory. Gel consistencies showed a seasonal cycle but thickening rates did no

ISSN:0008-4034    

DOI:10.1002/cjce.5450380206

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

年代:1960

数据来源: WILEY

摘要:

AbstractResults of measurements of pressure drop and holdup are reported over a range of air and water rates for the upward vertical flow of air‐water mixtures in a 1.50 inch I.D. tube with average air densities ranging from 0.092 to 0.552 lb./ft.3Superficial water velocities were between 0.0695 and 7.35 ft./sec.The data are analyzed by the method first suggested by Govier, Radford and Dunn and later used by Govier and Short. This involves the division of the flow range into four regimes on the basis of the pressure drop curves (to aid correlation of flow pattern and holdup data) and the separation of the unit pressure drop into hydrostatic and irreversible components. A superficial friction factor is calculated from the irreversible component of the unit pressure drop.The average density of the gas phase has a more or less marked effect on all three regime transitions. The transitions all shift similarly to lower air‐water discharge volume ratios with increasing gas phase density. While the flow patterns were not directly observed in the investigation here reported, the flow pattern transitions would be expected to behave similarly.Over the range investigated, the gas phase density has little or no effect on the superficial friction factor. The holdup ratio is unaffected by the gas phase density in Regimes I and II but is significantly affected in Regimes III and

ISSN:0008-4034    

DOI:10.1002/cjce.5450380207

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

年代:1960

数据来源: WILEY

ISSN:0008-4034    

DOI:10.1002/cjce.5450380201

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

年代:1960

数据来源: WILEY