Thermofluid Characteristics on Natural and Mixed Convection Heat Transfer From a Vertical Rotating Hollow Cylinder Immersed in Air: A Numerical Exercise

Basanta Kumar Rana; Bhajneet Singh; Jnana Ranjan Senapati

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Thermofluid Characteristics on Natural and Mixed Convection Heat Transfer From a Vertical Rotating Hollow Cylinder Immersed in Air: A Numerical Exercise

机译：自然和混合对流热传递的热流体特性从垂直旋转的空心圆柱体浸入空气中：数值运动

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Numerical investigations are performed on natural and mixed convection around stationary and rotating vertical heated hollow cylinder with negligible wall thickness suspended in the air. The fluid flow and heat transfer characterization around the hollow cylinder are obtained by varying the following parameters, namely, Rayleigh number (Ra), Reynolds number (Re_D), and cylindrical aspect ratio (L/D). The heat transfer quantities are estimated by varying the Rayleigh number (Ra) from 10~4 to 10~8 and aspect ratio (L/D) ranging from 1 to 20. Steady mixed convection with active rotation of hollow vertical cylinder is further studied by varying the Reynolds number (Re_D) from 0 to 2100. The velocity vectors and temperature contours are shown in order to understand the fluid flow and heat transfer around the vertical hollow cylinder for both rotating and nonrotating cases. The surface average Nusselt number trends are presented for various instances of Ra, Re_D, and L/D and found out that the higher rate of heat loss from the cylinder wall occurs at high Ra, low L/D (short cylinder) and high Re_D.

机译：对静止和旋转垂直加热空心圆柱周围的自然和混合对流进行数值研究，其悬挂在空气中可忽略不计的壁厚。通过改变以下参数，即瑞利数（RA），雷诺数（RE_D）和圆柱形纵横比（L / D）来获得空心圆柱周围的流体流动和传热表征。通过改变10〜4至10〜8的瑞利数（Ra）和宽高比（L / d）估计传热量，从1到20的范围内。进一步研究了中空垂直圆柱的主动旋转的稳定混合对流从0到2100改变雷诺数（RE_D）。示出了速度向量和温度轮廓，以便在垂直空心圆柱周围理解旋转和非调节情况的流体流动和热传递。呈现表面平均露天数趋势对于RA，RE_D和L / D的各种情况，并发现从汽缸壁上的较高的热量损失率在高RA，低L / D（短圆筒）和高re_d时发生。

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来源
《Journal of Heat Transfer》 |2021年第2期|022601.1-022601.12|共12页
作者
Basanta Kumar Rana; Bhajneet Singh; Jnana Ranjan Senapati;
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作者单位

School of Mechanical Engineering Kalinga Institute of Industrial Technology Deemed to be University Bhubaneswar 751024 India;

Department of Mechanical Engineering G B Pant Government Engineering College New Delhi 110020 India;

Department of Mechanical Engineering National Institute of Technology Rourkela Rourkela 769008 India;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
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关键词
mixed convection; rotating cylinder; Richardson number; thermal plume;

机译：混合对流;旋转圆筒;理查森号码;热羽毛;

Thermofluid Characteristics on Natural and Mixed Convection Heat Transfer From a Vertical Rotating Hollow Cylinder Immersed in Air: A Numerical Exercise

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