ISSN:0008-4034    

DOI:10.1002/cjce.5450620102

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

年代:1984

数据来源: WILEY

摘要:

AbstractThe thinning of the film beneath a liquid drop is often faster than predicted by radial drainage. This could be explained by asymmetrical drainage, but mathematical difficulties are then encountered. However, analytical solutions may be obtained for the two‐dimensional case and expressions are derived here for the asymmetric viscous drainage of films trapped between convex and concave wedges.Solutions for the symmetrical drainage beneath wedges and parabolae are also presented which are analogous to the three‐dimensional drainage beneath cones and paraboloids previously deri

ISSN:0008-4034    

DOI:10.1002/cjce.5450620103

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

年代:1984

数据来源: WILEY

摘要:

AbstractThe flow of various fluids of different rheological behaviour has been studied in both fixed and fluidized beds. These fluids were water and aqueous solutions of glycerin, Carbopol and Separan AP‐30. For small Deborah numbers, the flow of Carbopol and Separan AP‐30 solutions thorough fixed beds is well described by the Ergun relation using the generalized Reynolds number of Christopher and Middleman (1965). Deviations from this behaviour are observed in fluidized beds as preferential flow paths easily occur near the distributor. These deviations are small for Newtonian fluids but take more importance with non‐Newtonian solutions and are increased by viscoelast

ISSN:0008-4034    

DOI:10.1002/cjce.5450620104

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

年代:1984

数据来源: WILEY

摘要:

AbstractData are presented on separations involving systems containing small concentrations of iron particles in sand, and of salt particles in activated carbon, in a bottom‐driven 3.66 metre long fluidized cascade. At each fluidization velocity a maximum beneficiation ratio was found at a particular baffle chain velocity. The optimal baffle chain velocity increased with increasing fluidization velocity, and it was larger with 26 mm deep baffles than with 13 mm baffles. An analysis based on a theoretical model led to the conclusion that segregation kinetics are enhanced by the motion of the baffles just above the gri

ISSN:0008-4034    

DOI:10.1002/cjce.5450620105

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

年代:1984

数据来源: WILEY

摘要:

AbstractThe swelling and shrinking of Newtonian jets issuing from circular orifices or slits are examined. Equations predicting the die swell ratio and downstream flow characteristics are developed. It is found that the cause of swelling at low Reynolds numbers is related to a negative pressure (below the free stream pressure) at the slit exit. The scatter of experimental data has been studied and the factors contributing to this phenomenon are discussed. The die swell ratios and jet shapes versus Reynolds number for Newtonian liquids issuing from tubes are empirically shown.

ISSN:0008-4034    

DOI:10.1002/cjce.5450620106

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

年代:1984

数据来源: WILEY

摘要:

AbstractA method is proposed for calculating the steady‐state distribution of mixtures of solid particles and of the axial bed porosity in liquid fluidized beds. The extent of bed stratification is assumed to be determined by the differences among the settling velocities of the fluidized particles and the random motion of these particles that is a result of fluidization. Predictions of particle distribution based on the present method were found to agree reasonably well with experimental dat

ISSN:0008-4034    

DOI:10.1002/cjce.5450620107

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

年代:1984

数据来源: WILEY

摘要:

AbstractThe utility of using optimal input signals to improve the parametric information content in a transient experiment is explored. This work extends the statistical design concepts that have proven useful in steady state model building studies to a dynamic environment. The methodology is demonstrated for the identification of thermal transport properties in an adiabatic packed bed. The effects of the choice of measurements, initial parameter values and accuracies, and performance criteria are assessed. The results indicate that optimal dynamic experiments can offer considerable improvement over present practice.

ISSN:0008-4034    

DOI:10.1002/cjce.5450620108

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

年代:1984

数据来源: WILEY

摘要:

AbstractA study has been conducted on a slurry flow behavior in vertical tubes having diameters of one inch in an upflow mode. A tube sampling technique and an optical electronics method were developed to determine the slurry concentration and flow rates for flurries comprised of different size particles. These methods will be applied in cold flow simulation of a shell and tube slurry heat exchanger.

ISSN:0008-4034    

DOI:10.1002/cjce.5450620109

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

年代:1984

数据来源: WILEY

摘要:

AbstractNatural convection mass transfer measurements were made by the electrochemical method for spheres and eight nonspherical shapes in several orientations. Using a characteristic length which is sensitive to orientation, a natural convection correlation is proposed for objects of any shape having sphericities larger than 0.6.

ISSN:0008-4034    

DOI:10.1002/cjce.5450620110

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

年代:1984

数据来源: WILEY

摘要:

AbstractThe light attenuation technique has been modified to expand the range of its applicability up to AL values of 460. This has been accomplished through the use of a laser as the source of monochromatic collimated light, and a very sensitive low‐bias picoammeter.The data obtained using the photographic technique were found to agree reasonably well with those from light attenuatio

ISSN:0008-4034    

DOI:10.1002/cjce.5450620111

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

年代:1984

数据来源: WILEY