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首页> 外文期刊>Journal of enhanced heat transfer >HEAT TRANSFER AND PRESSURE DROP CHARACTERISTICS FOR FLOW THROUGH SQUARE CHANNEL WITH DELTA WING VORTEX GENERATOR ELEMENTS ON TWO OPPOSITE WALLS
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HEAT TRANSFER AND PRESSURE DROP CHARACTERISTICS FOR FLOW THROUGH SQUARE CHANNEL WITH DELTA WING VORTEX GENERATOR ELEMENTS ON TWO OPPOSITE WALLS

机译：通过达达翼涡流发生器元件在两个相对壁上流动传热和压降特性

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摘要

Experimental results for friction factor and heat transfer coefficients for flow through a square duct with delta wing vortex generators on two opposite walls are reported. The effects of geometrical parameters such as pitch-to-height ratio, aspect ratio, and height-to-duct hydraulic diameter ratio on the heat transfer coefficient and pressure drop were studied. Comprehensive results for a single vortex generator and limited data for two vortex generators in the spanwise direction at a given axial location are presented. Detailed local heat transfer distributions are presented for selected configurations. High heat transfer coefficients were observed both underneath and between successive vortex generator elements. The magnitudes of average heat transfer coefficients on the smooth walls adjacent to the roughened walls were only about 10% lower than those for the roughened walls. The ratio of Nusselt number and friction factor with and without the delta wing vortex generators for constant Reynolds number conditions are presented. The Nusselt number ratios at constant pumping power condition are also reported; the highest values for a single and two vortex generators at an axial location were observed to be 2.8 and 3.1, respectively. Semi-empirical correlations for heat transfer and friction factor, developed on the basis of available methodologies for roughened ducts, predict the measured data to within an error of about 15%.
机译：据报道，摩擦因子和传热系数的实验结果，用于通过两壁上的Delta翼涡流发生器流过方形管道的流动。研究了几何参数，例如间距高度比，纵横比和高度与管道液压直径比对传热系数和压降的影响。提出了单涡流发生器的综合结果，并在给定的轴向位置处的两个涡流发生器的有限数据。为所选配置提供了详细的本地传热分布。在下面和连续的涡流发生器元件之间观察到高传热系数。与粗糙壁相邻的光滑壁上的平均传热系数的大小仅比粗糙壁低约10％。呈现了与恒定Reynolds数常数条件的NUSERET数和摩擦系数与ΔWING涡流发生器的比率。还报道了恒定泵送功率条件下的营养数比率;观察到轴向位置的单个和两个涡流发生器的最高值分别为2.8和3.1。基于可用方法的传热和摩擦系数的半经验相关性，在粗糙的管道中开发，预测测量数据在约15％的误差内。

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