Abstract
In this paper, critical heat flux (CHF) experiment was carried out in a vertical single-rod channel using R-134a as working fluid to study the effect of mixing-vanes spacer grid (MVSG) on CHF enhancement. The single-rod channel had a rectangular geometry with a uniformly heated rod centrally installed. The test conditions were pressure from 1.8 to 2.7 MPa, mass fluxes from 600 to 2100 kg·m−2·s−1 and subcooling temperature from 10 to 40 ℃, which was determined by Katto’s fluid-to-fluid modeling method with reference to the operation condition of Pressurized Water Reactors (PWRs). The effects of flow parameter and downstream distance on CHF enhancement by MVSG were investigated. In addition, visualization study on flow regime during CHF occurrence and bubble behavior when passing though MVSG was observed by a high-speed camera, which contributed to improving better understanding on the mechanism of CHF enhancement by MVSG.
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