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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Convection heat transfer of CO2 at supercritical pressures in a vertical mini tube at relatively low reynolds numbers
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Convection heat transfer of CO2 at supercritical pressures in a vertical mini tube at relatively low reynolds numbers

机译：雷诺数较低的垂直微型管中超临界压力下的CO2对流传热

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摘要

Convection heat transfer of CO2 at supercritical pressures in a 0.27 mm diameter vertical mini tube was investigated experimentally and numerically for upward and downward flows at relatively low inlet Reynolds numbers (2900 and 1900). The effects of inlet temperature, pressure, mass flow rate, heat flux, flow direction, buoyancy and flow acceleration on the convection heat transfer were investigated. For inlet Reynolds numbers less than 2.9 x 103, the local wall temperature varies non-linearly for both flow directions at high heat fluxes (113 kW/m(2)). For the mini tube used in the current study, the buoyancy effect is normally low even when the heating is relatively strong, while the flow acceleration due to heating can strongly influence the turbulence and reduce the heat transfer for high heat fluxes. For relatively low Reynolds numbers (Re-in <= 2.9 x 10(3)) and the low heat flux (30.0 kW/m(2)) the predicted values using the LB low Reynolds number correspond well with the measured data. However, for the high heat flux (113 kW/m2), the predicted values do not correspond well with the measured data due to the influence of the flow acceleration on the turbulence. (C) 2008 Elsevier Inc. All rights reserved.
机译：通过实验和数值研究了在相对低的入口雷诺数（2900和1900）下向上和向下流动时，在直径为0.27 mm的垂直微型管中，在超临界压力下对CO2的对流换热进行了研究。研究了入口温度，压力，质量流量，热通量，流向，浮力和流加速度对流换热的影响。对于进口雷诺数小于2.9 x 103的情况，在高热通量（113 kW / m（2））下，两个流动方向的局部壁温非线性变化。对于当前研究中使用的微型管，即使加热比较强，浮力效果通常也很低，而加热引起的流动加速会强烈影响湍流并降低高热通量的热传递。对于较低的雷诺数（Re-in <= 2.9 x 10（3））和较低的热通量（30.0 kW / m（2）），使用LB低雷诺数的预测值与测量数据非常吻合。但是，对于高热通量（113 kW / m2），由于流动加速度对湍流的影响，预测值与测量数据并不十分吻合。 （C）2008 Elsevier Inc.保留所有权利。

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