摘要:

AbstractTwo‐phase solids‐in‐air flow was experimentally studied in a once‐through circular tube flow system using nominal 25μ and 50μ spherical glass beads. At mass flow ratios up to 1.6, the friction factor was found to be generally higher than that for air flow alone but considerably less than that for a single‐phase fluid having a density the same as that of the mixture.The pressure drop experienced by the 2 phase system of 25μ beads and air was found to show true drag reduction.A continuum mechanics analysis showed the viscous stresses and Reynolds stresses to be significantly affected by solid parti

ISSN:0008-4034    

DOI:10.1002/cjce.5450500401

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

年代:1972

数据来源: WILEY

摘要:

AbstractA new model is presented for treating transient freezing in laminar tube‐flow. The liquid motion is constrained by requiring head‐loss versus flow‐rate to match that of a linear pump‐characteristic curve. This feature enables the model to describe freezing conditions which may lead to occlusion of the tube with solid‐phase material.The results demonstrate the sensitivity of tube occlusion both to temperature and liquid‐pumping capability. Both steady‐state and transient results obtained compare favorably with those found in the literature, which include an exact steady‐state solution. Maximum error is e

ISSN:0008-4034    

DOI:10.1002/cjce.5450500402

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

年代:1972

数据来源: WILEY

摘要:

AbstractThe radiative heat transfer in a cylindrical furnace was investigated both experimentally and theoretically.The flow pattern within the combustion chamber was measured and found to differ from that of an identical cold model for which extensive theoretical and experimental work had been previously carried out.The Monte Carlo Method was used to solve for the radiative transfer part of the non‐linear integro‐differential equations describing the combustion and heat transfer in a cylindrical furnace.The radiative heat flux distribution obtained from the simulation agreed well with data obtained from a cylindrical test furn

ISSN:0008-4034    

DOI:10.1002/cjce.5450500403

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

年代:1972

数据来源: WILEY

摘要:

AbstractThis study is concerned with the developing temperature field for flow in circular tubes and parallel plate channels with mass transfer through the wall. Some unique features of the developing temperature field are outlined for both constant temperature and constant heat flux boundary conditions. Solutions to the heat transfer problem are extended to include arbitrary prescribed temperature or heat flux boundary conditions. A practical problem is solved in two ways, utilizing respectively these solutions, and a comparison of the results is made.

ISSN:0008-4034    

DOI:10.1002/cjce.5450500404

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

年代:1972

数据来源: WILEY

摘要:

AbstractThe various mass‐transfer resistances that occur in a packed bed of zeolite granules contribute to the gas chromatographic “C” terms that determine the relative width (or second moment) of a gas chromatographic peak. It was assumed that mass transport in the micropores of the crystallites was independent of the nature of the carrier gas. From measurements with hydrocarbon pulses in hydrogen and nitrogen carrier gases, it was possible by the method of Giddings and Schettler to separate the gas phase resistances from the micropore resistances. Data are given for benzene, n‐octane and (in part) n‐decane on Na × zeolite at 370, 400 and 430°C. Experimental difficulties and precautions ar

ISSN:0008-4034    

DOI:10.1002/cjce.5450500405

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

年代:1972

数据来源: WILEY

摘要:

AbstractAn investigation of the non‐adiabatic tubular reactor, in which a single chemical reaction occurs, is presented. The steady state mass and heat balance equations are shown to be a pair of coupled, nonlinear differential equations, and are shown to uncouple into a single functional‐differential equation for the case Le = 1. A‐priori bounds on the steady state concentration and temperature are developed, and some remarks about the shape of the steady state profiles made. Sufficient conditions ensuring uniqueness of steady states and their asymptotic stability are de

ISSN:0008-4034    

DOI:10.1002/cjce.5450500406

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

年代:1972

数据来源: WILEY

摘要:

AbstractThe reaction between a porous solid pellet and a gas is analyzed in the asymptotic region of the effectiveness factor. The solid consumption is divided in two stages. The influences of effective diffusivity and surface area profiles are taken into account for both stages through a correction modulus of the effectiveness factor. The conversion — time relationship can be calculated for a selected model of porous structure and any reaction order for the gaseous reactant. The results are extended to non‐equimolar counterdiffusion and a non‐isothermal situation with external heat and mass transfer resist

ISSN:0008-4034    

DOI:10.1002/cjce.5450500407

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

年代:1972

数据来源: WILEY

摘要:

AbstractRelationships have been developed for the calculation of the viscosity of a polar gas at atmospheric pressure from macroscopic parameters available for the substance. The molecular force constants for the Stockmayer potential determined by Monchick and Mason from viscosity data were related to the critical constants of the substance and the parameters ω and × defined through the vapor pressure. For 10 polar gases, an average deviation of approximately 3.0% was obtained between experimental viscosities and values calculated with the relationships of this study. The relationships were also utilized to calculate diffusion coefficients for a number of polar binary mixture

ISSN:0008-4034    

DOI:10.1002/cjce.5450500408

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

年代:1972

数据来源: WILEY

摘要:

AbstractPrigogine's corresponding states approach to equilibrium properties of pure r‐mers is extended to include transport properties. For r‐mer molecules, besides the alike element pair potential parameters, additional quantities are required to characterize the geometrical structure of the molecule and thereby describe more adequately pair potential interactions. As an example, the theory is applied to the homologous series of liquid n‐alkanes. The characteristic parameters for each member of the homologous series are determined using pure component viscosity data at one atmosphere and pure component denstiy data at one temperature and atmospheric pressure. The technique correlates pure component r‐mer transport properties (viscosity — 981 points, thermal conductivity — 216 points) over a wide range of temperature and pressure within experimental error. Using the present technique, available self‐diffusion coefficients are al

ISSN:0008-4034    

DOI:10.1002/cjce.5450500409

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

年代:1972

数据来源: WILEY

摘要:

AbstractA new equation for salt effect in vapor‐liquid equilibrium is presented, which correlates temperature and the liquid‐phase concentrations of all three components with equilibrium vapor composition, for isobaric systems consisting of a binary to which • salt has been added to saturation. The equation, of form\documentclass{article}\pagestyle{empty}\begin{document}$$ \frac{{\Delta \mu ^E }}{z} = C_1 + C_2 x + C_3 z + C_4 x^2 + C_5 xz + C_6 z^2 $$\end{document}was tested successfully with literature data for 12 ethanol‐water‐salt systems, yielding a better fit for all 12 systems than the one‐constant equation of Johnson and Furter, and with the confidence level for the comparison in excess of 99.9% for six of thesys

ISSN:0008-4034    

DOI:10.1002/cjce.5450500410

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

年代:1972

数据来源: WILEY