By G.F. Hewitt

ISBN-10: 0080157971

ISBN-13: 9780080157979

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1962). Multijet injection. intimately mixed, by increasing the amount of liquid entrained, the homogeneous model gives better predictions. This condition is approached, for instance, by decreasing the surface tension. This effect is probably the cause of the approach to homogeneity in steam-water systems as the pressure is increased, since this is accompanied by a reduction in surface tension. 5. The Lockhart-Martmelli model The most commonly used method of calculating two-phase pressure drops is that of Martinelli and co-workers (Lockhart and Martinelli, 1949; Martinelli and Nelson, 1948).

21) where ε is the "eddy viscosity". In the highly developed turbulent region, (y used the von Karman model for which τ is given by . 10. It will be seen that eqn. 23) predicts that the eddy viscosity approaches zero as the wall is neared. 3. Application of single-phase flow concepts to the prediction of annular two-phase flow For laminar annular film flow, the analysis is relatively straightforward once the distribution of shear stress can be specified. Such a specification follows readily from the evaluation of interfacial shear stress.

43) For a two-phase flow at constant quality, the equivalent of eqn. 44) dp Pi and i {* Gl K » Ê I / « î ) - ( « ' â 2 * / « i ) ] + ( I - * ) g\ 3 3 2 faun - )ι α = F+ f[xvG 2 ] - [ ^ 2 5 2 / ( ΐ - « ) + (1 - x) Vj2 dp . 45) Pi Assuming incompressible flow and

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Annular Two-Phase Flow by G.F. Hewitt


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