Abstract
Two phase flow instability in narrow rectangular channels has been studied experimentally. The test section consisted of one unheated by-pass and two heated rectangular channels, 1000mm in length and having 25mm×2mm cross sections. Various phenomena, in parallel channels, were studied in detail, from onset of flow instability (OFI) to density wave oscillation. The experimental results show that as the two heated rectangular channels operate past OFI, with a constant pressure drop, an increase in power can result in a sharp decrease in the mass flow rate. Following a continued increase of power, density wave oscillation occurs between the parallel channels. Concurrently, the effects of various conditions including operating system pressure, inlet subcooling number, and mass flow rate on the threshold of instability are presented. The stability boundary map of Density wave oscillation (DWO) is obtained through the use of the dimensionless subcooling number (Nsub) and phase change number (Npch).
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