Interfacial Structure of Gas-Liquid Two-Phase Flow in Narrow Rectangular Channel

摘要

The two-phase flow in mini/micro channels is becoming important in many industrial applications. To remove high heat flux from electric and power devices, the flow boiling in narrow rectangular channels is one of the most effective heat-dissipation methods, and several studies have been made on the two-phase flow characteristics confined to the narrow space. The present study addresses the effect of the flow orientation on the gas-liquid interfacial structure and the frictional pressure gradient in narrow rectangular channel. Simultaneous measurements of pressure gradients and spatio-temporal characteristics of gas-liquid interface are conducted for three different flow orientations; vertical upward flow (V flow), horizontal flow between horizontal plates (H-H flow) and horizontal flow between vertical plates (H-V flow). The velocity field in the liquid film with interfacial waves is also measured by PIV and LIF method. To investigate the contribution of the interfacial structure to the frictional pressure gradient, a hydrodynamic flow model of the liquid phase is presented for the narrow rectangular channel.