摘要:

AbstractExperimental data of natural convection heat transfer from a heated horizontal plate, both facing upward and downward, to a non‐Newtonian fluid are reported. Empirical expressions essentially similar to those developed for the vertical plate case are obtained which correrlate the data with reasonable accurac

ISSN:0008-4034    

DOI:10.1002/cjce.5450440201

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

年代:1966

数据来源: WILEY

摘要:

AbstractRelationships relevant to the design of industrial melters are developed for the case in which the molten material is a time‐independent non‐Newtonian fluid of the Power Law type. Expressions are derived for the local and mean values of the heat transfer coefficient in the melting of a solid slab on a hot, inclined, plane surface at constant temperature. The equations developed are restricted to laminar flow of the melt, and a criterion is therefore presented for checking that the molten film between the hot surface and the slab is actually in laminar flow throughout its entire len

ISSN:0008-4034    

DOI:10.1002/cjce.5450440202

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

年代:1966

数据来源: WILEY

摘要:

AbstractAn analytic study of heat transfer and temperature and composition distribution was conducted for a reacting fluid in laminar flow in a tubular reactor. The reaction chosen was reversible and homogeneous of the formA⇆ 2U.Numerical solutions were obtained by machine computation for conditions of chemical equilibrium and of finite kinetics. For endothermic, dissociative reactions the radial energy transfer due to diffusion adds to the contribution due to a temporary difference. Nusselt numbers up to 10 fold greater than those for the corresponding inert system are obtained. The diffusion contribution is a maximum when the radial mass transfer is not subject to a reaction resistance; i.e. at equilibriu

ISSN:0008-4034    

DOI:10.1002/cjce.5450440203

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

年代:1966

数据来源: WILEY

摘要:

AbstractIn this paper a new experimental method, based on the freezing of the fluidized bed by the aid of paraffin wax is used for the determination of the diffusion coefficient of the solid particles. The experimental diffusion coefficients are compared with those given by a theoretical equation. In order to explain the time and spatial dependence of the experimental diffusion coefficient a cinematographic study supplemented by visual observations is also made. One concludes that for small tube diameters a circulation motion of the solid particles takes place which is responsible for the mentioned effect.

ISSN:0008-4034    

DOI:10.1002/cjce.5450440204

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

年代:1966

数据来源: WILEY

摘要:

AbstractHard water was concentrated using steam heating in a single tube climbing film evaporator, of length 9 ft. and external diameter 1 inch.The heat fluxQ/Ain BTU/hr. sq. ft. was found to be related to the feed rate of the waterMlb./hr. and its temperature Ti°F by the equationQ/A= ψM0.6+ 90.3 (Tb–Ti)Cpwhere ψ is a graphically read function of the temperature difference driving force between the condensing steam and the boiling water. The data fit the above equation with a standard deviation of 2.6%.The empirically derived equation for heat flux was also found to represent the data for other aqueous solutions with reasonable accu

ISSN:0008-4034    

DOI:10.1002/cjce.5450440205

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

年代:1966

数据来源: WILEY

摘要:

AbstractThe surface diffusion of He, Ne, H2, Ar, O2, N2and CO2through Vycor microporous glass was analyzed theoretically and experimentally in the low pressure range as a function of temperature. A statistical‐mechanical treatment was carried out in terms of partition functions to derive a general equation of surface flow. It was possible to separate the surface diffusion from the total flow using a simplified working equation. The conventional method which assumes that there is no adsorbed flow for helium should be discarded, because the fraction of surface diffusion for helium ranges from 0.133 to 0.247. It is also illustrated how to predict the permeability of a new gas for the same porous mediu

ISSN:0008-4034    

DOI:10.1002/cjce.5450440206

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

年代:1966

数据来源: WILEY

摘要:

AbstractThe trajectories and terminal velocities of particles in vertically oscillating fluids have been studied by obtaining analytic and numerical solutions to the nonlinear Langevin equation representing a superposition of forces arising from particle acceleration, displaced fluid acceleration, buoyancy and particle‐fluid drag as represented by an nth‐power drag law. In vibrating fluids the directional particle velocities are found to be lower than in stationary fluids for drag exponentsn>1 and correspondingly higher for 0

ISSN:0008-4034    

DOI:10.1002/cjce.5450440207

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

年代:1966

数据来源: WILEY

摘要:

AbstractThe dynamic response of a periodically forced, surface catalyzed chemical system was studied experimentally. A comparison is made of dynamic correlations based on transfer function and equivalent gain models. The latter is shown to have significant advantages.

ISSN:0008-4034    

DOI:10.1002/cjce.5450440208

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

年代:1966

数据来源: WILEY

摘要:

AbstractAn apparatus for measuring the thrust of liquid jets is described and the effect of surface tension on jet thrust discussed in detail.Whether the liquids used are nominally “Newtonian” or “viscoelastic”, there is a consistent trend in the expansion‐contraction behaviour. This is explained on the grounds that the fluids, from ethyl alcohol and glycerol on the one hand to poly (ethylene oxide) solutions on the other, possess appreciable elastic properties. Thrust measurements using short capillaries support this contention.At very low Reynolds numbers the jet thrusts are unusually high; it is suggested that this results from a purelyviscous p

ISSN:0008-4034    

DOI:10.1002/cjce.5450440209

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

年代:1966

数据来源: WILEY

摘要:

AbstractThe extrusion of moist alumina and silica powders was experimentally studied. The materials were deduced to behave plastically by comparison with similar work on metals. Some factors required for coherent extrudate are considered.

ISSN:0008-4034    

DOI:10.1002/cjce.5450440210

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

年代:1966

数据来源: WILEY