ISSN:0001-1541    

DOI:10.1002/aic.690040428

出版商:American Institute of Chemical Engineers    

年代:1958

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690040429

出版商:American Institute of Chemical Engineers    

年代:1958

数据来源: WILEY

摘要:

AbstractA correlating equation for liquid‐phase adsorption equilibria, including the effects of temperature and pore diameter, is presented, together with a derivation of the equation ascribing the equilibration process of physical adsorption to van der Waal's forces. The derivation is based on the effect of temperature and surface configuration on the concentration of adsorbate at the surface. The correlating equation was tested with experimental data for the benzene‐cyclohexane‐silica‐gel system and the toluene‐isooctane–silica‐gel system. Temperatures ranged between 23.9° and 99°C. and the pore diameters between 2

ISSN:0001-1541    

DOI:10.1002/aic.690040402

出版商:American Institute of Chemical Engineers    

年代:1958

数据来源: WILEY

摘要:

AbstractResults from precise calculations for fractionation of multicomponent hydrocarbon mixtures show that the relative separations between components are rationalized in a simple manner in terms of the relative volatilities. A quantitative criterion for sharpness of fractionation with complex mixtures, the Fractionation Index, is suggested. This function is useful for general correlation purposes. It also enables prediction of the detailed compositions of the products from a proposed fractionation and thereby simplifies the computation procedures.

ISSN:0001-1541    

DOI:10.1002/aic.690040403

出版商:American Institute of Chemical Engineers    

年代:1958

数据来源: WILEY

摘要:

AbstractThe effect of fluid physical properties on the rates of convective heat transfer (or mass transfer) to Newtonian fluids flowing turbulently inside tubes has been studied extensively but never resolved for a wide range of variables. In the absence of precise experimental data the conflicting predictions of the many semitheoretical approaches developed during the last two decades have served to confuse rather than to clarify the basic question. To extend the range of the available data an experimental heat transfer study of the heretofore undefined region of high Prandtl number was performed. Fluid properties, determined experimentally, represented a variation in Prandtl number from 50 to 600.For final correlation all the available data for heat transfer with moderate temperature differences except those on liquid metals were considered. The effect of the Prandtl number for the range of the data (NProf 0.50 to 600) was not well represented by any of the generally accepted theories or empirical equations, although a semitheoretical correlation was deduced from the data with Reichardt's general formulation of the analogy between heat and momentum transfer. The resulting equation fits all the available data with a standard deviation of 9.4%. The applicability of the correlation to turbulent mass transfer in tubes is demonstrated for Schmidt numbers up to 3,000.

ISSN:0001-1541    

DOI:10.1002/aic.690040404

出版商:American Institute of Chemical Engineers    

年代:1958

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690040405

出版商:American Institute of Chemical Engineers    

年代:1958

数据来源: WILEY

摘要:

AbstractIn order to study effects of wetting on heat transfer in the nucleate boiling regime, stearic acid was boiled in contact with different crystal planes of single crystals of copper. One crystal plane being wetted by the acid more completely than the other, they are calledwettedandnonwettedsurfaces. In the region of low heat flux, where heat transfer is primarily nonboiling natural convection, the nonwetted crystal required higher values of temperature difference than the wetted crystal for the same flux. At high values of heat flux, though not in the vicinity of the critical temperature difference, the situation was reversed; that is, the nonwetted surface required lower temperature difference than the wetted surface.In the present studies, stearic acid was boiled at about 465°F., corresponding to a pressure of 17 mm. of mercury. Heat flux ranged from 3,450 to 63,300‐B.t.u./(hr.)(sq. ft.), and temperature difference between the copper crystal and the stearic acid ranged from 38° to 132°F. The corresponding range of heat transfer coefficient was from 91 to 510 B.t.u./(hr.)(sq. ft.)(

ISSN:0001-1541    

DOI:10.1002/aic.690040406

出版商:American Institute of Chemical Engineers    

年代:1958

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690040407

出版商:American Institute of Chemical Engineers    

年代:1958

数据来源: WILEY

ISSN:0001-1541    

DOI:10.1002/aic.690040408

出版商:American Institute of Chemical Engineers    

年代:1958

数据来源: WILEY

摘要:

AbstractSolutions of linearized Navier‐Stokes equations have been developed for the motion of arbitrary two‐dimensional waves occurring at any interface between the emulsion phase of a fluidized bed and the particle‐free, fluid phase. In all cases for which the bed particles are denser than the fluidizing fluid the solutions showed that the lower interface of a bed always is unstable and the upper, stable. The quality of fluidization is suggested to be related at least in part to the rate of growth of surface waves, this rate depending upon physical properties of the system and length of the disturbing

ISSN:0001-1541    

DOI:10.1002/aic.690040409

出版商:American Institute of Chemical Engineers    

年代:1958

数据来源: WILEY