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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

INVESTIGATION OF CORRELATION FOR FORCED CONVECTIVE HEAT TRANSFER TO SUPERCRITICAL CARBON DIOXIDE FLOWING IN A VERTICAL TUBE

Lang Xuemei
CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology, Nuclear Power Institute of China, Chengdu, 610041, China

Liu Shenghui
CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology, Nuclear Power Institute of China, Chengdu, 610041, China

Huang Yanping
CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology, Nuclear Power Institute of China, Chengdu, 610041, China

Liu Guangxu
CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology, Nuclear Power Institute of China, Chengdu, 610041, China

Wang Junfeng
CNNC Key Laboratory on Nuclear Reactor Thermal Hydraulics Technology, Nuclear Power Institute of China, Chengdu, 610041, China

Abstract

An experimental investigation of turbulent convective heat transfer to supercritical carbon dioxide flowing upward and downward vertically was conducted in a heated bare tube with an inner diameter of 10mm. Among the experimental conditions, the data show that the phenomenon of buoyancy and acceleration is obvious. For the upward cases, as the buoyancy effect increasing the forced convective heat transfer to carbon dioxide will transform to mixed convective heat transfer, then free convective heat transfer, in which the heat transfer capacity is weakened firstly, then resumed and even strengthened. The acceleration often weakens the heat transfer capacity both for upward and downward flow. A new heat transfer correlation for carbon dioxide at supercritical pressures was developed. Assessment shows that 95.03% of the predicted Nusselt numbers agree with the experimental data within ±30% error band.

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