Abstract

Complex small-scale finned and ribbed passages are being used with increasing frequency in compact high-performance evaporators and condensers. The complexity and small scale of these passages causes the flow and transport mechanisms to differ substantially from those in larger simpler tubes more commonly used in power, process and refrigeration applications. Special features of two-phase and transport in ribbed and finned passages are described. Results of recent investigations which have illuminated some of the very different mechanisms that arise in these circumstances are also summarized. The effects of liquid shedding from discontinuous structures, the strong role of surface tension forces, and the existence of recirculation zones and lateral nonuniformity of the flow are especially important in these small-scale passages. The impact of these features on modeling of two-phase transport in evaporators and condensers is also discussed.

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