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Numerical analysis of 2-D laminar natural convection heat transfer from solid horizontal cylinders with longitudinal fins
International Journal of Thermal Sciences ( IF 4.5 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.ijthermalsci.2020.106391
Dibyendu Konar , Mohammad Asif Sultan , Subhransu Roy

Abstract Proper thermal management through an effective cooling mechanism is essential for improving the reliability of operation of various electronic devices. A number of cooling methods are available among which passive cooling by natural convection has been deemed appropriate since it has distinctive advantages over active cooling or forced convection like high reliability, low maintenance cost, energy efficiency and noise-free nature. In the present study, natural convection from solid horizontal cylindrical heat sources of the geometry and dimensions of heat sinks of LED bulbs with external longitudinal plate fins have been modelled. Numerical computations of continuity, momentum and energy equations to solve the two dimensional incompressible natural convection conjugate heat transfer from such cylinders has been studied in the laminar regime ( 4 . 5 × 1 0 5 Ra D 5 . 2 × 1 0 5 ). The diameter of the cylinder is kept at 60 mm whereas the length is kept at 50 mm. The number of fins has been varied from three to 36, the height of fins kept at 10, 20 and 30 mm and thickness at one mm. The effect of fin geometry parameters and Rayleigh number on total heat transfer, heat transfer exclusively from fin surface and from bare cylinder surface, heat transfer per fin and Nusselt number based on cylinder diameter have been studied in detail. Finally, optimum fin spacing for a particular fin height has been evaluated. Contour plots to capture temperature and velocity vectors around the heat source have also been developed. Numerical correlations of Nusselt number as a function of Rayleigh number, non-dimensional fin spacing and non-dimensional fin height reveal that the scaling laws of Ra D 1 ∕ 3 and Ra D 1 ∕ 4 are valid both for the computational data of our present analysis and experimental data even though the experiments are for a slightly different boundary condition.

中文翻译:

具有纵向翅片的实心水平圆柱体二维层流自然对流换热数值分析

摘要 通过有效的冷却机制进行适当的热管理对于提高各种电子设备的运行可靠性至关重要。有多种冷却方法可供选择,其中自然对流被动冷却被认为是合适的,因为它比主动冷却或强制对流具有独特的优势,如高可靠性、低维护成本、能源效率和无噪音特性。在本研究中,对具有外部纵向板翅的 LED 灯泡的散热器的几何形状和尺寸的固体水平圆柱形热源的自然对流进行了建模。连续性的数值计算,已经在层流状态 (4 . 5 × 1 0 5 Ra D 5 . 2 × 1 0 5 ) 中研究了用于求解此类圆柱体二维不可压缩自然对流共轭传热的动量和能量方程。圆柱体的直径保持在 60 毫米,而长度保持在 50 毫米。翅片的数量从 3 个增加到 36 个,翅片的高度保持在 10、20 和 30 毫米,厚度保持在 1 毫米。详细研究了翅片几何参数和瑞利数对总传热、仅从翅片表面和裸圆柱表面传热、每个翅片的传热和基于圆柱直径的努塞尔数的影响。最后,评估了特定翅片高度的最佳翅片间距。还开发了用于捕获热源周围温度和速度矢量的等值线图。
更新日期:2020-08-01
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