Principles of Convective Heat Transfer pp 417-487 | Cite as

# Fluid-Fluid Systems

## Abstract

In this chapter, we consider fluid-fluid two-phase flows under the condition that the *interfacial heat transfer* between the two fluids is the principal con-vective heat transfer. We also examine the models describing *phasic energy conservation* for cases where one of the fluids is *dispersed* within the other. The heat transfer between a pair of *nonvolatile immiscible liquids* is of interest in the direct-contact heat exchange, and generally one of the liquids is dispersed. We first consider these liquid-liquid systems and the condition for a liquid-liquid interfacial *vapor nucleation*. The *gas-liquid systems* are considered next. These are the most widely encountered fluid-fluid system and occur with or without a *continuous interface*, with or without a *phase change*, and with or without a *chemical* reaction (for multicomponent systems). Since the gases from two different streams brought together *mix*, the two-medium treatment of the *gas-gas systems* is limited to the application in the modeling of the *low-pressure plasmas* heat transfer. There, the heat exchange between the electrons and the heavier species must be addressed. Although this heat exchange is through *molecular collisions* and is dealt with using the result of the kinetic theory of gases, the two-medium treatment of the electrons and the heavier species, discussed briefly in Section 5.4.5, has similarities with the phasic energy conservation equations used in this chapter and in Chapter 5.

## Keywords

Heat Transfer Nusselt Number Heat Mass Transfer Bubble Growth Droplet Evaporation## Preview

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