摘要:

AbstractThere has been a growing interest in control strategies that optimize a given performance criterion to improve process efficiencies. Optimal control techniques, such as LQP, have been available but did not find much acceptance in process industries because of certain problems that are involved in their application. In this paper an approach is presented which alleviates these problems. Simulation results show that the proposed approach works well for servo and regulatory control problems.

ISSN:0008-4034    

DOI:10.1002/cjce.5450660121

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

年代:1988

数据来源: WILEY

摘要:

AbstractGas holdup and pressure loss were measured for various gas‐liquid systems in a batch, multistage bubble column. Experimental results show that the use of screen plates (α = 0.64) considerably increases the gas holdup but introduces a significant pressure loss for the two‐phase mixture. The pressure loss was found to be independent of physical properties of the mixture, and predictable either from the modified separated flow model (Chen et al., 1986) or from the kinetic energy loss based on the liquid circulation velo

ISSN:0008-4034    

DOI:10.1002/cjce.5450660122

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

年代:1988

数据来源: WILEY

摘要:

AbstractA photographic technique was devised for obtaining drop size distribution in a liquid‐liquid (kerosene‐water) spray column. Drop sizes were determined with the aid of a reference ball, using a double‐flash technique with side lighting. Experimentally analyzed Sauter mean diameters were in good agreement with those predicted by the Kumar and Hartland correlations. The technique was applied up to a holdup of about 6% in this countercurrent flow

ISSN:0008-4034    

DOI:10.1002/cjce.5450660123

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

年代:1988

数据来源: WILEY

摘要:

AbstractExperimental results are presented of wall effect for the slow motion of spheres in elastic, constant‐viscosity liquids. The results are correlated in terms of diameter ratio ford/D<0.3, and Weissenberg number We<5. Weissenberg number is defined as We = 2θVm/d, with θ the Maxwellian relaxation time (θ =N1/2τγ).The wall effect is found to be adequately described by Newtonian expressions for small Weissenberg number, We0.2, virtually no wall effect is discernible; the small effect observed is correlated by the wall factor expressionThe wall effect observed is ascribed to the influence of fluid elasticity alone, since all the fluids used were elastic to a greater or lesser extent, but showed no shear thinning.\documentclass{article}\pagestyle{empty}\begin{document}$$ f = 1 - 0.17d/D $$\end{do

ISSN:0008-4034    

DOI:10.1002/cjce.5450660124

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

年代:1988

数据来源: WILEY

摘要:

AbstractThe effect of 50.8 mm diameter disc shaped mobile internals (MIs) on gas‐solid contacting was studied in a large two‐dimensional fluidized bed by means of non‐reactive tracers. MIs were found to improve substantially the mass transfer coefficient between the bubble and dense phases. However, they also increased the gas dispersion in the dense

ISSN:0008-4034    

DOI:10.1002/cjce.5450660125

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

年代:1988

数据来源: WILEY

摘要:

AbstractSpherical electrode carbon particles prepared from carbon rods of dry cell batteries have been used to study the attrition behaviour in a bubbling fluidized bed combustor. Experiments have been conducted in a 40 mm I.D. and 1 m high fluidized bed combustor operated at 1 m/s superficial velocity. The bed was operated with nitrogen and with two different oxygen concentrations at 850°C to study the effect of combustion on attrition of these particles. The experimental technique used allowed the time resolution of attrited fines generation, providing detailed curves of attrition rates as a function of time. Attrition rate constants have been evaluated. Results show an enhancement of attrition due to combustion even for spherical, homogeneous and smooth particles

ISSN:0008-4034    

DOI:10.1002/cjce.5450660126

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

年代:1988

数据来源: WILEY

摘要:

AbstractA theoretical analysis of the reactant concentration profile along a given number of CSTR's in series for ping‐pong type reactions following Michaelis‐Menten kinetics (with equal initial concentrations for both substrates) has been developed. Minimising the total holding time was taken as the intermediate objective function whereas minimising the total capital investment was assumed to be the main objective funct

ISSN:0008-4034    

DOI:10.1002/cjce.5450660127

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

年代:1988

数据来源: WILEY

ISSN:0008-4034    

DOI:10.1002/cjce.5450660130

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

年代:1988

数据来源: WILEY

ISSN:0008-4034    

DOI:10.1002/cjce.5450660131

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

年代:1988

数据来源: WILEY

ISSN:0008-4034    

DOI:10.1002/cjce.5450660135

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

年代:1988

数据来源: WILEY