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Experimental and numerical investigations on slot air jet impingement cooling of a heated cylindrical concave surface

机译：加热圆柱凹面的缝隙空气射流冲击冷却实验与数值研究

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摘要

Experimental and numerical studies have been carried out for slot air jet impingement on a heated concave surface of a partially opened-top horizontal cylinder of length L = 20 cm. The slot jet is situated at the symmetry line of the partially opened-top cylinder along the gravity vector and impinges to the bottom of the cylinder which is designated as θ= 0°. The width of the opening at the top of the horizontal cylinder is W = 3 cm which corresponds to a circumferential angle Δθ = 50.8°. The experiments are performed by a Mach-Zehnder interferometer which enables to measure the local convection heat transfer coefficient. Also, a finite volume method based on the SIMPLE algorithm and non-orthogonal grid discretization scheme is used to solve the continuity, momentum, and energy equations. The Poisson equations are solved for (x, y) to find the grid points which are distributed in a non-uniform manner with higher concentration close to the solid regions. The effects of jet Reynolds number (Re_j) in the range from 190 to 1,600 and the ratio of spacing between nozzle and cylinder surface to the jet width from H = 1.5 to H = 10.7 on the local and average Nusselt numbers are examined. It is observed that maximum Nusselt number occurs at the stagnation point at (θ= 0°) and the local heat transfer coefficient decreases on the circumferential surface of the cylinder with increase of θ as a result of thermal boundary layer thickness growth. Also results show that the local and average heat transfer coefficients are raised by increasing the jet Reynolds number and by decreasing the nozzle-to-surface spacing.
机译：已经进行了实验和数值研究，以将狭缝空气射流撞击在长度为L = 20 cm的部分开口的水平圆柱体的加热凹面上。狭缝射流沿着重力矢量位于部分敞开的圆柱体的对称线上，并撞击到圆柱体的底部，标记为θ= 0°。水平圆柱体顶部的开口宽度为W = 3 cm，对应于圆周角Δθ= 50.8°。实验是通过Mach-Zehnder干涉仪进行的，该干涉仪能够测量局部对流传热系数。此外，基于SIMPLE算法和非正交网格离散化方案的有限体积方法用于求解连续性，动量和能量方程。求解（x，y）的泊松方程，以找到网格点，这些网格点以不均匀的方式分布，靠近固体区域的浓度更高。考察了雷诺数（Re_j）在190至1,600范围内以及喷嘴和圆柱表面之间的间距与喷嘴宽度的比值从H = 1.5至H = 10.7对局部和平均Nusselt数的影响。观察到最大努塞尔数出现在（θ= 0°）的停滞点，并且由于热边界层厚度的增加，圆柱的周向表面的局部传热系数随θ的增加而减小。结果还表明，通过增加射流雷诺数和减小喷嘴到表面的间距，可以提高局部和平均传热系数。

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  • 来源
    《Heat and mass transfer》 |2014年第4期|437-448|共12页
  • 作者

    H. Nouri-Bidgoli; M. Ashjaee; T. Yousefi;

  • 作者单位

    Department of Mechanical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran;

    School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran;

    Department of Mechanical Engineering, Razi University, Kermanshah, Iran;

  • 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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