摘要:

AbstractSome fairly general considerations arising out of the work of Cholette and Blanchet on combined stirred tank and tubular reactors are here presented. General analytical and graphical conditions for the optimality of the MT combination are given and it is shown that, save for autocatalytic reactions, the combination is only optimal for sufficiently exothermic reactions. The proportions of the optimal combined reactor can be readily calculated and it is shown that the stirred tank design is always stable. A circumstance under which the TM combination is optimal is also suggested but it is thought to be of rare occurrence.

ISSN:0008-4034    

DOI:10.1002/cjce.5450400302

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

年代:1962

数据来源: WILEY

摘要:

AbstractA review and comparison of the various methods which have been proposed for the correlation of the pressure drop attending the flow of gas‐liquid mixtures is made. The friction factor and other terms employed in the correlations are related mathematically.The horizontal flow of air‐water mixtures has been investigated in a 41 ft. length of cellulose acetate butyrate tubing of 1.026 in. i. d. The average system pressure was held constant at 36 p.s.i.a. maintaining a constant air density of 0.18 lb./cu. ft. Flow pattern, holdup and pressure drop data were obtained at air‐water volume ratios from 0.1 to 200 (700 in some cases) for 10 superficial water velocities from 0.01 to 5.03 ft./sec. These data overlap and extend the range covered by previous investigators.The flow patterns observed at constant superficial water velocity with increasing air‐water ratio were: bubble, plug, stratified, wave or ripple, slug and film. Bubble, plug and slug flow were encountered only at superficial water velocities above about 0.1 ft./sec. while stratified flow was encountered only at superficial water velocities below about 1 ft./sec. and superficial air velocities below about 5 ft./sec.The holdup ratio, a measure of the relative accumulation of the water in the flow section, increased with air velocity for all superficial water velocities reaching a maximum value of over 50. At constant superficial air velocity the holdup ratio increased rapidly with decrease in superficial water velocity.The pressure drop data were converted to a friction factor based upon the density and the superficial velocity of the water. The friction factors were correlated with the superficial Reynolds number for the water, and the air‐water volume ratio. The data are compared in this form with previous data of Schneider, Thomsen, and Johnson and

ISSN:0008-4034    

DOI:10.1002/cjce.5450400303

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

年代:1962

数据来源: WILEY

摘要:

AbstractThe determination of the partial coefficients of heat and mass transfer in air from and to a drying fluidized mass of silica gel is given. The analogy between the two methods of transport in the bed has been studied by an inspection of the relation between the two coefficients. A correlation of these coefficients with the void fraction, the superficial velocity, the particle size and the tube diameter of the bed has been derived. This correlation has been transformed into a correlation of dimensionless groups.

ISSN:0008-4034    

DOI:10.1002/cjce.5450400304

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

年代:1962

数据来源: WILEY

摘要:

AbstractThis paper deals with the calculation of the evaporative load distribution in a spray of droplets suspended in an absorbing gas medium contained in a cylindrical column after a temperature profile for the gas has been assumed.Preliminary experimental data obtained for water sprays in an 8‐in. i.d. by 10‐ft. high pilot‐plant atomized suspension reactor at wall temperatures up to 800°C. are used to illustrate the method of calculation.The calculated results emphasize the importance of the physical characteristics of the spray, such as initial drop‐size and distribution, drop velocities and spray angle. They also indicate that the dynamics of such spray systems, as well as their heat and mass transfer aspects, require further ela

ISSN:0008-4034    

DOI:10.1002/cjce.5450400305

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

年代:1962

数据来源: WILEY

ISSN:0008-4034    

DOI:10.1002/cjce.5450400306

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

年代:1962

数据来源: WILEY

摘要:

AbstractApproximate local and overall Sherwood numbers have been predicted theoretically for forced‐convection transfer around solid and fluid spheres for Reynolds numbers up to 100. The diffusion equation was solved analytically for the case of a thin concentration boundary layer (NPo» 1).The predicted overall Sherwood numbers are in fair agreement with published semi‐empirical correlat

ISSN:0008-4034    

DOI:10.1002/cjce.5450400307

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

年代:1962

数据来源: WILEY

摘要:

AbstractThe modified Rayleigh equation is a non‐linear differential equation governing the growth of bubbles during cavitation. It has been programmed on an analog computer, and the effects on the growth of bubbles of the initial conditions and the physical properties of the system, such as density, viscosity and surface tension, have been made the subject of a detailed parameter study. The observations that the initial growth may be delayed and that the rate of bubble growth may pass through a minimum have been explained by an energy balance. A first order perturbation method has been applied to the case where the effect of viscosity is smal

ISSN:0008-4034    

DOI:10.1002/cjce.5450400308

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

年代:1962

数据来源: WILEY

摘要:

AbstractSulphite oxidation rates using several metal ions as catalyst in four types of contacting equipment have been measured over a considerable range of agitation levels. The data show no simple relation between the various sulphite oxidation rates and the transfer coefficient for oxygen from air to fermentation media.

ISSN:0008-4034    

DOI:10.1002/cjce.5450400309

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

年代:1962

数据来源: WILEY

摘要:

AbstractThe asymptotic solutions of the classical Graetz‐Nusselt Problem is extended to the case of power‐law non‐Newtonian fluid flowing between parallel plates. Expressions are given for the eigen value, eigen functions and its related expressions, average temperature and Nusselt mo

ISSN:0008-4034    

DOI:10.1002/cjce.5450400310

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

年代:1962

数据来源: WILEY

ISSN:0008-4034    

DOI:10.1002/cjce.5450400301

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

年代:1962

数据来源: WILEY