ISSN:0008-4034    

DOI:10.1002/cjce.5450490102

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

年代:1971

数据来源: WILEY

摘要:

AbstractA procedure is developed to measure diffusion coefficients in the liquid phase for slightly soluble solids. Transient concentration profiles for the dissolution of a planar solid surface are obtained by means of a Mach‐Zehnder interferometer. Fitting of these profiles to Fick's second law then provides a measure of the diffusivity, even when it is concentration dependent.Application of the technique to the water‐benzoic acid system yields a diffusion coefficient at 25°C which is 1.3 × 10−5cm2/sec at infinite dilution and which decreases slowly as the concentration approaches saturation. The initial value for acetanilide in water is 1.1 × 10−5cm2/sec at 25°C and again the diffusivity decreases as the concentratio

ISSN:0008-4034    

DOI:10.1002/cjce.5450490103

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

年代:1971

数据来源: WILEY

摘要:

AbstractA model was developed for the eddy diffusivity and mean velocity distributions in fully developed turbulent isothermal smooth pipe flow (4 × 103

ISSN:0008-4034    

DOI:10.1002/cjce.5450490104

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

年代:1971

数据来源: WILEY

摘要:

AbstractA two‐dimensional experimental model has been developed to simulate turbulent flow in porous materials. It uses cross flow through a matrix of cylinders between parallel plexiglass plates. Matrix geometry was chosen to approximate a bed of packed spheres.Pressure loss and axial dispersion in several models have been measured over a wide range of flow rates in the non‐Darcy region. Photographs have been taken of flow patterns developed in the transition from laminar to fully turbulent flow. All typical characteristics of flow through beds of packed spheres were exhibited; however, both pressure loss and dispersion differed somewhat when compared to similar three‐dimensional

ISSN:0008-4034    

DOI:10.1002/cjce.5450490105

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

年代:1971

数据来源: WILEY

摘要:

AbstractA steady‐flow capillary viscosimeter, using dry air as the test gas, has been demonstrated at 150, 230, 330 and 430° Centigrade and over a pressure range of 35–150 atmospheres. Measured viscosities showed a maximum isothermal increase of about 4%. An extrapolation procedure was used to correct for flow and temperature discrepancies and a modified Hagen‐Poiiseuille equation, using variables evaluated at the mean capillary temperature, was applied to those data taken under nonisothermal conditions. The overall assembly and technique are capable of relative viscosity measurements having a standard deviation within 11/2% in the cited

ISSN:0008-4034    

DOI:10.1002/cjce.5450490106

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

年代:1971

数据来源: WILEY

摘要:

AbstractIncreasing the viscosity of injected water for more efficient oil recovery has been of interest to the petroleum industry since 1900. In recent years, certain high molecular weight water soluble organic polymers have been developed which, in small concentrations, can increase the viscosity of water substantially and, under certain conditions, recover additional oil economically.The rheological properties, adsorption, transport characteristics, and oil recovery efficiency of several polymer solutions are presented. The viscosity of the polymer solutions depends largely on the flow rate, the type of polymer, and the solvent. Oil recovery depends primarily on the permeability distribution of the porous model. Adsorption varied from 30 to 225 μg/g. Because the process utilizes a polymer solution slug of small volume, the stability of the slug was considered. Following a polymer slug with water led to viscous instabilities and slug breakdown. If the polymer concentration in the slug was reduced to zero asymptotically before injecting water, the viscous instabilities were eliminated

ISSN:0008-4034    

DOI:10.1002/cjce.5450490107

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

年代:1971

数据来源: WILEY

摘要:

AbstractGels, formed by suspending cellulose acetate particles of regular shape and size in a Newtonian medium, were sheared in a rotational viscometer to study their time dependent rheological behavior. Qualitative observations of the effect of the well defined particle parameters, shape surface area and concentration on the flow parameters were made.The viscosity decay behavior fitted the model previously proposed by Pinder for slurries of natural particles.By considering the effect of the weighting salt used in the suspending medium, it was found that the theory that ionic forces are active in stabilizing the thixotropic gel structure was supported.

ISSN:0008-4034    

DOI:10.1002/cjce.5450490108

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

年代:1971

数据来源: WILEY

摘要:

AbstractThe results of an experimental study on compressible turbulent wall jets resulting from a normally impinging round jet are presented. A finite difference technique was used for the calculation of velocity and temperature profiles. The eddy transfer coefficients used were functions of the distance from the plate throughout the flow field of the wall jet. The nozzle exit Mach number ranged up to 0.85. The nozzle exit temperature to the ambient temperature ratio ranged up to 2.92. The applicability of the calculational method has been thoroughly checked for a region of flow extending up to 12 nozzle diameters from the axis of symmetry. Using the empirical eddy transfer coefficients presented in this paper only starting profiles are needed to generate the solution for any point in the wall jet flow field which is described by a system of parabolic (boundary layer) equations.

ISSN:0008-4034    

DOI:10.1002/cjce.5450490109

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

年代:1971

数据来源: WILEY

摘要:

AbstractExperiments have been carried out to determine the effect of centrifugal force on the rate of condensation of vapors. Methanol and isopropanol vapors were condensed on a vertical rotating finned tube and it was found that the data could be correlated by the equation:\documentclass{article}\pagestyle{empty}\begin{document}$$ \[ h_{co} = 0.655(k_c ^3 p_c ^2 \lambda /\mu _c )^{0.25} [G^1 /L^1 \Delta T]^{0.25} \]* $$\end{document}Condensation film heat transfer coefficients in excess of 5,700 W/(m2°K) and 4,200 W/(m2°K) were obtained for methanol and isopropanol respectively at a tube rotational speed of 1,000 rp

ISSN:0008-4034    

DOI:10.1002/cjce.5450490110

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

年代:1971

数据来源: WILEY

摘要:

AbstractMass transfer with a fast second‐order chemical reaction inside a drop has been studied photographically. Measured flow patterns and the reaction surface position have been compared with predictions of solutions of transport equations. The agreement is within experimental erro

ISSN:0008-4034    

DOI:10.1002/cjce.5450490111

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

年代:1971

数据来源: WILEY