Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7054073 | International Journal of Heat and Mass Transfer | 2018 | 7 Pages |
Abstract
Experimental and numerical investigations on spacer-induced heat transfer deterioration of supercritical water in annular channel have been carried out. The test section consists of a heated outer rod of 15.0â¯mm inner diameter and a concentric unheated inner rod of 7.41â¯mm outer diameter, forming a 3.80-mm-wide annular channel. A spacer with block ratio of 0.3 is equipped into the channel. The experimental conditions are the pressure of 23-25â¯MPa, mass flux of 450-1200â¯kg/(m2s), heat flux of 400-1000â¯kW/m2 and fluid temperature of 240-450â¯Â°C. The spacer-induced heat transfer deterioration occurs at the conditions of mass flux 450â¯kg/(m2â¯s), heat flux 400â¯kW/m2 and specific fluid temperature region. Based on the experimental data, the criteria for the occurrence of deterioration are obtained. For the case that heat transfer deteriorates, the wall temperature experiences a couple of oscillations before recovering to the fully developed state. In order to study the mechanism of this complicated heat transfer behavior, numerical simulation has been performed with FLUENT and a reasonable explanation has been proposed.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Fluid Flow and Transfer Processes
Authors
Zhen-xiao Hu, Da Liu, Han-yang Gu,