Abstract
Natural Circulation Loops (NCLs) find application in a wide range of engineering devices and it is often necessary to predict and ensure the performance of such loops under various operating conditions. In this paper an analytical expression for steady state mass flow rate in a typical rectangular, two-phase natural circulation loop having Vertical Heater-Vertical Cooler (VHVC) configuration is derived in non-dimensional form. The normalized loop mass flow rate is obtained in terms of several geometrical and operating variables. The model is first validated using published data for two loops having different pipe diameters. It is then applied for conducting parametric studies to elucidate the effect of key variables on the performance of loop. The discussions in this paper are limited to explaining the influence of individual variables by comparing with a base case analysis.
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