Mass and heat transfer from rigid spheres

Abstract

The comments concernin the annular rheometer should also apply to the falling cygnder rheometer since it is essentially an annular flow system with a moving boundary.From the above discussion one may conclude that the method proposed by Swift et al. using the equations developed for the Couette, annular, and falling cylinder rheometers to obtain shear stress-shear rate data is an approximate one in which the accuracy of the results improve as Ri -+ R,. ACKNOWLEDGMENTThe author is indebted to Dr. W. R. Schowalter for his comments and suggestions concerning the usefulness and clarity of various approaches taken in the development of this communication. NOTATION f i = functionality symbol L = length over which AP is measured m

3D CFD simulation of flashing flows in a converging-diverging nozzle

“…Various correlations ranging from empirical to analytical have been proposed for the estimation of interphase heat transfer coefficient such as Ranz and Marshall (1952), Hughmark (1967), Plesset and Zwick (1954) and Labuntzov et al (1964). In this work, the analytical model of Aleksandrov (1967) is used, which considers both conduction and convection heat transfer, and contains no empirical constants.…”

Interfacial heat transfer of condensing bubble in subcooled boiling flow at low pressure

“…The two-phase analysis code, TRAC-P1A, uses the correlation proposed by Kelly and Kazimi [17] and MINI-TRAC that by Hori and Toda [18], while CFX-4.2 adapts correlations by Ranz and Marshall [19] and Hughmark [20]. MARS uses Unal-Lahey's correlation as the system code [21].…”

Evaluation of Interfacial Heat Transfer Models for Flashing Flow with Two-Fluid CFD

“…The empirical constants in Equation (24) are A = 1/2, B = 1/3 and C = 0.6. Hughmark [49] suggested that these constants are valid for the range Re p < 450 and Pr l < 250. …”