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Heat Transfer Analysis of a Microspherical Particle in the Slip Flow Regime by Considering Variable Properties

机译：考虑变量特性的滑流区微球形颗粒传热分析

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摘要

In order to investigate how far the temperature-dependent fluid properties and characteristic length influence the drag coefficient and the heat flux, a three-dimensional simulation study for a slip flow around an unconfined microspherical particle has been performed. Gas properties such as density, viscosity, conductivity, and mean free path were assumed to vary with temperature. Slip velocity and temperature jump at the gas particle interface were both treated numerically by imposition of the slip boundary conditions. The effects of variable gas properties and Knudsen number on momentum and heat transfer were also taken into account. It was concluded that for microflows with high heat transfer rates, the constant fluid properties approximation is very crude. In addition, the slip velocity and temperature jump affect the heat transfer in opposite ways: a large slip on the wall increases the convection along the surface, whereas a large temperature jump decreases the heat transfer by reducing the temperature gradient at the wall. Therefore, neglecting temperature jump will result in the overestimation of the heat transfer coefficient.
机译：为了研究与温度有关的流体特性和特征长度对阻力系数和热通量的影响程度，对围绕无约束微球形颗粒的滑流进行了三维模拟研究。假定气体特性（例如密度，粘度，电导率和平均自由程）随温度变化。气体边界处的滑动速度和温度跃变均通过施加滑动边界条件进行了数值处理。还考虑了可变气体性质和克努森数对动量和热传递的影响。结论是，对于具有高传热速率的微流，恒定的流体性质近似是非常粗糙的。此外，滑移速度和温度跃变以相反的方式影响热传递：壁上的大滑移会增加沿表面的对流，而大的温度跃变会通过减小壁上的温度梯度来降低热传递。因此，忽略温度跃变会导致热传递系数的高估。

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  • 来源
    《Heat Transfer Engineering》 |2015年第8期|596-610|共15页
  • 作者

    BEHZAD MOHAJER; VAHID ALIAKBAR; MEHRZAD SHAMS; ABOUZAR MOSHFEGH;

  • 作者单位

    Faculty of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran;

    Faculty of Mechanical Engineering, K. N. Toosi University of Technology, Tehran, Iran;

    Faculty of Mechanical Engineering, K. N. Toosi University of Technology, Pardis St., Vanak Sq., Tehran 19395-1999, Iran;

    School of Aerospace, Mechanical & Mechatronic Engineering, University of Sydney, Sydney, Australia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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