Combined Radiation and Convection in Developing Flow in a Parallel Plate Channel with Real Gas Behavior: The Case of Gas Cooling

IF 2.8 4区工程技术 Q2 ENGINEERING, MECHANICAL

Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-03-28 DOI:10.1115/1.4062205

Kyle Pulsipher, B. W. Webb

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Abstract

The effect of real gas volumetric radiation on the thermal development in laminar parallel plate channel flow of H2O and/or CO2 in the case of gas cooling has been investigated numerically. The non-gray radiation effects of the gas have been treated using a global spectral approach, the Spectral Line Weighted-sum-of-gray-gases model. The results reveal that gas radiation results in significantly higher total heat transfer to the cooled channel wall, with an attendant more rapid drop in gas mean temperature. Gas radiation is seen to increase the local convective and total (radiative plus convective) Nusselt number for increasing radiating species mole fraction for both H2O and CO2, and for increasing gas inlet temperature. The influence of gas radiation on the thermal development is lower for CO2 than for H2O. An apparent thermally fully-developed condition may exist for this combined convection-radiation problem with real gases in the gas cooling scenario, and radiation has the effect of significantly extending the thermally developing region. Combined hydrodynamic and thermal development yields higher heat transfer than the thermally developing condition. Smaller channel wall spacing results in lower radiative heat transfer, and the aforementioned radiation effects are diminished. Local convective and radiative flux, and thermal entry length also increase with elevated gas total pressure.

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辐射和对流在具有真实气体行为的平行平板通道中展开流动中的结合:以气体冷却为例

本文用数值方法研究了气体冷却情况下，实际气体体积辐射对水和/或二氧化碳层流平行板通道热发展的影响。气体的非灰色辐射效应已使用全局谱方法，即谱线加权-灰色气体和模型来处理。结果表明，气体辐射导致冷却通道壁面的总换热显著增加，同时气体平均温度下降更快。气体辐射增加了局部对流和总(辐射加对流)努塞尔数，增加了H2O和CO2的辐射物质摩尔分数，增加了气体入口温度。气体辐射对CO2热发育的影响小于H2O。在气体冷却情景下，这种对流-辐射联合问题可能存在明显的热充分发展条件，辐射对热发展区域有显著的扩展作用。水动力和热发展联合产生比热发展条件下更高的传热。壁面间距越小，传热越小，上述辐射效应减弱。局部对流通量和辐射通量以及热入口长度也随着气体总压的升高而增加。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Heat Transfer-transactions of The Asme 工程技术-工程：机械

自引率

0.00%

发文量

182

审稿时长

4.7 months

期刊介绍： Topical areas including, but not limited to: Biological heat and mass transfer; Combustion and reactive flows; Conduction; Electronic and photonic cooling; Evaporation, boiling, and condensation; Experimental techniques; Forced convection; Heat exchanger fundamentals; Heat transfer enhancement; Combined heat and mass transfer; Heat transfer in manufacturing; Jets, wakes, and impingement cooling; Melting and solidification; Microscale and nanoscale heat and mass transfer; Natural and mixed convection; Porous media; Radiative heat transfer; Thermal systems; Two-phase flow and heat transfer. Such topical areas may be seen in: Aerospace; The environment; Gas turbines; Biotechnology; Electronic and photonic processes and equipment; Energy systems, Fire and combustion, heat pipes, manufacturing and materials processing, low temperature and arctic region heat transfer; Refrigeration and air conditioning; Homeland security systems; Multi-phase processes; Microscale and nanoscale devices and processes.