Download Boiling Heat Transfer: Modern Developments and Advances by R.T. Lahey Jr. PDF

By R.T. Lahey Jr.

This quantity covers the fashionable advancements in boiling warmth move and two-phase move, and is meant to supply commercial, govt and educational researchers with cutting-edge examine findings within the zone of multiphase move and warmth move expertise. precise awareness is given to know-how move, indicating how fresh major effects can be utilized for functional applications.

The chapters provide unique technical fabric that might be necessary to engineers and scientists who paintings within the box of multiphase move and warmth move.

The authors of all chapters are contributors of the CMR at Rensselaer, a examine centre focusing on the cutting-edge in multiphase technological know-how.

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Extra resources for Boiling Heat Transfer: Modern Developments and Advances

Example text

This regime is also identical to vertical flow except grav­ ity tends to keep the liquid from the upperregions ofthe duct or make the liquid drain down around the sides if deposited in the upper regions. Thus, part of the duct lateral periphery dry most or all of the time. may be completely Stratified flow is herein considered to be a limiting subset of this flow pattern which occurs when all the liquid resides at the bottom of the duct. The gas flow may be insufficient to cause any curvature of the interface.

R;, ::c 2 t';I ,J:J 0 :c p. 8 Void Fraction (d) churn flow Figure 4. Probability densities for flow regime identification. regime. For the dispersed flow regime, the drift flux model has elements bon-owed from the theory of molecular drift in matter. This model treats the two-phase flow as a mixtw e but ac­ counts for the relative motion of one phase within the other and couples the two by correlating the interaction effects. For the sepa ated flow regime, the two-fluid model treats each phase as a sepa­ rate continuum and couples the two with intelfacial boundary conditions.

PJc VI: • n dS and taking the time derivative inside the integration over the (fixed) volume V gives (6) 33 If we assume that the integrand in eq. (6) is continuous in V, then by the Dubois­ Reymond Lemma, the integrand vanishes. Thus, we have the equation of balance of mass: (7) The momentum of phase k inside of V is defined to be (8) The momentum of phase k inside of V can change due to several different effects. First, momentum can move into or out of of V This is expressed as V with the mass that moves in or out (9) In addition, the material outside of V exerts a force on the material inside of through the boundary av of V.

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