| 矩形闭合空间内多孔介质中自然对流传热研究 |
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| 引用本文： | 俞伦鹏,孙仁洽.矩形闭合空间内多孔介质中自然对流传热研究[J].东南大学学报(自然科学版),1987(3). |
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| 作者姓名： | 俞伦鹏 孙仁洽 |
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| 作者单位： | 航天部第一计量测试研究所，南京工学院动力工程系 |
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| 摘 要： | 对底面恒温加热顶面恒温冷却、其它壁面绝热的矩形闭合空间内多孔介质中的自然对流传热问题,简化为二维模型进行数值计算和分析,在Ra≤300范围内,揭示了流场、温度场和换热效果随瑞利数(Ra)变化的特性,证实了从导热向自然对流开始过渡的第一临界瑞利数 Ra_c=40,给出了努谢尔特数(Nu)、瑞利数(Ra)和形状比(A)之间关系的理论计算公式和曲线。
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| 关 键 词： | 多孔介质 闭合空间 自然对流传热 流场 温度场 数值计算 |
Natural Convective Heat Transfer inside the Porous Media in a Closed Rectangular Cavity |
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| Yu Lunpeng.Natural Convective Heat Transfer inside the Porous Media in a Closed Rectangular Cavity[J].Journal of Southeast University(Natural Science Edition),1987(3). |
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| Authors: | Yu Lunpeng |
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| Institution: | Yu Lunpeng (Bejing Research Institute for Metrology and Measurement)Sun Renqia (Jen-Hsia) (Department of Power Engineering) |
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| Abstract: | The natural convective heat transfer in fluid saturated porous media within a rectangular enclosure heated from below and cooled at the top,both isothermally,while the rest walls are adiabatic,is investigated for the 2-dimensional case,numerically.Rayleigh numbers range from 30 to 300. The indication of the onset of convective flow with the first critical Rayleigh number Ra_c at 40 is verified by the present analysis.The variations in flow field,temperature distribution and heat transfer with the increase of Rayleigh number are shown.Correlations of Nusselt number Nu with Rayleigh number Ra at various aspect ratios are given in order to facilitate the heat transfer calculations. |
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| Keywords: | porous medium enclosure natural convective heal transfer flow field temperature distribution numerical analysis |
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