摘要:

AbstractThe behavior of rigid circular cylinders suspended vertically in viscous fluids in laminar shear flow was found to compare favorably with a theory for infinitely long cylinders which we have extended to include interactions between two cylinders of different diameters. A description of the versatile Couette apparatus in which most of the experiments were performed is included. Observations were made on single cylinders at various distances from the wall bounding flow, on collisions between cylinders of both equal and unequal diameters and on interactions between a cylinder and a sphere. Collision doublets were found to be either permanent or separating, depending on the initial orientations and separations of the particles. The behavior of these particles is analogous to that of spheres in Couette flow.

ISSN:0008-4034    

DOI:10.1002/cjce.5450450102

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

年代:1967

数据来源: WILEY

摘要:

AbstractExperiments have been performed to determine mass transfer coefficients for the dissolution of sodium chloride particles carried as a “settling” suspension in a horizontal pipeline. The coefficients obtained for two sizes of particles, along with other coefficients available from the literature for different systems, have been correlated with an average deviation of only 7% by making use of Durand's equation for predicting pressure gradients for the flow of “settling” suspensions and the analogy between momentum and mass t

ISSN:0008-4034    

DOI:10.1002/cjce.5450450103

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

年代:1967

数据来源: WILEY

摘要:

AbstractThe electrification of fluids of low conductivity resulting from constricted flow has been studied. Currents and voltages have been measured using insulated test sections. For discussion purposes, the electrification process has been subdivided into two regions; an electrostatic region (high static voltages and low currents) and a streaming region (low voltages and high streaming currents produced by flow constriction).Symmetrical negative and positive streaming current curves were obtained from the insulated metal tubes located upstream and downstream from the constriction. The magnitude of the streaming current was dependent on the constriction flow area, the polar solute, the conductivity of the solution, and the flow rate. Low voltages were measured in the streaming region because of the high conductivity of the fluid. Currents have been related to the measured voltage and the conductivity of the solution.

ISSN:0008-4034    

DOI:10.1002/cjce.5450450104

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

年代:1967

数据来源: WILEY

摘要:

AbstractHeats of mixing of n‐pentane, n‐decane and n‐tridecane with benzene were experimentally determined at 25d̀C. Values of the parameters associated with the quasi‐lattice theory were evaluated using the experimental results together with the literature heats of mixing values for the systems benzene‐n‐hexane, benzene‐n‐heptane, benzene‐n‐octane, benzene‐n‐nonane and benzene‐n‐hexadecane. Using the literature model for benzene, the values of the parameters for the n‐alkanes that resulted in the “best fit” of the experimental data differ from those reported in the literature. A set of parameter values is reported which permits the evaluation of heats of mixing values for binary benzene‐n‐alkane systems within an average absolute deviation of 3.6%, with the except

ISSN:0008-4034    

DOI:10.1002/cjce.5450450105

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

年代:1967

数据来源: WILEY

摘要:

AbstractThe surface tensions of both simple and complex liquid mixtures are considered. It is shown that the surface tensions of mixtures of simple liquids can be predicted well from a model utilizing the concept of a regular surface solution. For complex mixtures, the use of a parameter reflecting the difference in characteristic energy between the bulk liquid and the surface leads to a good fit of the data for a number of systems.

ISSN:0008-4034    

DOI:10.1002/cjce.5450450106

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

年代:1967

数据来源: WILEY

摘要:

AbstractThe 0.38 latent heat law due to Watson is examined and it is found that the exponent (0.38) in Watson's relation is characteristic of the substance. A method of evaluating the exponent is outlined.

ISSN:0008-4034    

DOI:10.1002/cjce.5450450107

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

年代:1967

数据来源: WILEY

摘要:

AbstractThe “thermal effectiveness‐transfer unit” charts developed by the authors, for multipass exchangers, assume that the overall heat transfer coefficient varies as a parabolic function of temperature; their use can lead to greater accuracy in calculating heat transfer

ISSN:0008-4034    

DOI:10.1002/cjce.5450450108

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

年代:1967

数据来源: WILEY

摘要:

AbstractCHARLES W. SOLBRIGThe problem of convective diffusion with a first order reaction on one wall of a catalytic reactor is solved to implement the determination of rate constants from overall conversion measurements. The analysis applies to an isothermal gas mixture with constant physical properties and a parabolic velocity profile. A complete separation of variables, an entrance region, and a fully developed solution as well as asymptotic expressions for large eigenvalues are presented.A formula is given which expresses the Nusselt number as a function of the rate constants. These quantities combine as additive resistances to form an effective rate constant. By analogy, one could apply these results to a plate heat exchanger with a finite wall resistance.

ISSN:0008-4034    

DOI:10.1002/cjce.5450450109

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

年代:1967

数据来源: WILEY

摘要:

AbstractTheoretical expressions were developed for the design of a tubular reactor for the calcination of limestone, pneumatically conveyed by flue gas. The total residence time and the length of the reactor are affected in particular by the particle size, the excess thermal capacity of the gas and the heat transfer coefficient. High throughput can be achieved in relatively small reactors.An experimental investigation verified a theoretical prediction, that a considerable part of the decomposition takes place in the first few centimeters of the reactor length. The rate of heat transfer in this section was high, with Nusselt numbers of 9.9 to 31.7.

ISSN:0008-4034    

DOI:10.1002/cjce.5450450110

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

年代:1967

数据来源: WILEY

摘要:

AbstractGaseous eddy diffusivity measurements were made by a point injection technique in a 6.5‐in. column packed with open‐end screen cylinders varying in size from 3/8‐in. to 1 1/2‐in. diameter, and made from wire cloth varying from 4 to 28 mesh/in. Oxygen was used as the tracer gas. Only packings made from 4 to 10 mesh/in. produced concentration profiles which were symmetric. The latter data show that turbulent diffusivity increases linearly with gas flow rate, but decreases with decreasing mesh opening and wire diameter. A correlation is presented for turbulent diffusivities as a function of the Reynolds number,dmuρ/m̈, and the r

ISSN:0008-4034    

DOI:10.1002/cjce.5450450111

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

年代:1967

数据来源: WILEY