Thermal Energy Storage, Heat Pump and Thermal Energy Transportation Technologies. Natural Convection Heat Transfer in the Open Space between Two Horizontal Circular Planes with Different Temperatures.

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  • TOKANAI HIDEKI
    Department of Materials Science and Engineering, Yamagata University
  • KURIYAMA MASAFUMI
    Department of Materials Science and Engineering, Yamagata University
  • HARADA EIJI
    Department of Materials Science and Engineering, Yamagata University
  • KONNO HIROTAKA
    Department of Materials Science and Engineering, Yamagata University

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  • 蓄熱・ヒートポンプ・熱輸送　　温度の異なる円形水平２平面間の開空間における自然対流熱伝達
  • オンド ノ コトナル エンケイ スイヘイ 2 ヘイメン カン ノ カイクウカン

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Abstract

A vertical cylinder maintained at room temperature is located right above a horizontal circular heated plane to constitute a narrow air space between the plane and the cylinder bottom surface. Natural convection heat transfer in the space is experimentally investigated.<BR>Average heat transfer coefficients of the heated plane are presented with the variation of space distance and Rayleigh number, and are compared with the predictions of the correlation equations which have been proposed for the space between two infinite parallel plates.<BR>Visualized flow patterns above the heated plane are also shown. The relation between the flow pattern and the heat transfer coefficient is discussed to clarify the mechanism of heat transfer in the narrow space. As a result, a heat transfer correlation is proposed, which is applicable to a wide range of space distances.

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