INVESTIGATION OF HEAT EMISSION DURING FREE CONVECTION IN APPLICATION TO THE CLOSURE RELATIONS FOR COMPUTATIONAL CODES

摘要

Domestic and foreign data on free convection along vertical heated plates and tubes are analyzed. It is shown that the difference between the heat-emission coefficients during free convection can reach 70%. Heat emission along vertical tubes, especially in turbulent air-flow regimes, has been little studied. Meanwhile, a regime close to free convection complicated by heat exchange, for which a correction is made in the closure relations pertaining to heat emission for computational codes, is realized in the passive heat-removal system for the containment. Direct numerical modeling of free convection along vertical plates and tubes is performed.