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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental study of mixed convection heat transfer on the heated plate with the circular-nozzle synthetic jet
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Experimental study of mixed convection heat transfer on the heated plate with the circular-nozzle synthetic jet

机译：圆喷嘴合成射流在加热板上混合对流换热的实验研究

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This study experimentally examined the mixed convection heat transfer characteristics of a horizontal heated plate with the impinging cooling of down-blowing (Model 1) or up-blowing (Model 2) synthetic jet. The synthetic-jet device was made of a loudspeaker and a cylindrical acrylic chamber. The signal function generator and amplifier imported electric voltage at different frequencies and amplitudes to the loudspeaker, so that the loudspeaker's membrane surface vibrated at different displacements and frequencies. Then, the 3 mm-diameter circular nozzle on the end face of cylindrical chamber generated synthetic jet. The ratio of nozzle diameter (d) to the heated-plate diameter (D) was 0.06. The variable parameters included mean jet Reynolds number (Re_f = 230-4593), Grashof number (Gr= 1.25 × 10~5-5.51 × 10~5) and relative impingement distance (c/d = 1-11). The experimental results showed that at a specified Re_j, the Nu of various models basically increased with c/d. However, some cases showed that Nu declined as c/d exceeded some critical value. In addition, when the impingement distance was short (c/d =1) and in a small Reynolds number range (Re_j ≦ 1155), Model 1 generated the cancelation effect (forward impinging jet and natural convection are opposite in direction) and enhancement effect (deflected wall jet intersects natural convection transversely) of mixed convection heat transfer at the same time. When c/d increased (e.g. c/d = 11), there was a large forward impingement contact area due to the diffusion effect of jet, and the cancelation effect of forced convection and natural convection of Model 1 was more significant. The enhancement effect of mixed convection heat transfer was formed in Model 2. When Re_j was small, the Nu of Model 2 was larger than that of Model 1. When Re_j ≧ 2105, both models had similar Nu, and it did not vary with Or, meaning the overall heat transfer was dominated by forced convection. Finally, this study established an empirical Nu correlation of mixed convection in terms of Re_j and Gr at various c/d for Model 1 and Model 2, applicable to heat transfer analysis and optimal design of synthetic-jet device.
机译：这项研究实验性地检验了水平加热板的混合对流传热特性，以及向下吹（模型1）或向上吹（模型2）合成射流的冲击冷却。合成喷射装置由扬声器和圆柱形丙烯酸室制成。信号函数发生器和放大器将不同频率和幅度的电压输入到扬声器，从而使扬声器的膜表面以不同的位移和频率振动。然后，在圆柱形腔室端面上的直径为3 mm的圆形喷嘴产生合成射流。喷嘴直径（d）与加热板直径（D）之比为0.06。可变参数包括平均射流雷诺数（Re_f = 230-4593），格拉索夫数（Gr = 1.25×10〜5-5.51×10〜5）和相对撞击距离（c / d = 1-11）。实验结果表明，在指定的Re_j下，各种模型的Nu基本上都随着c / d的增加而增加。但是，一些情况表明，当c / d超过某个临界值时，Nu下降。此外，当碰撞距离短（c / d = 1）并且在雷诺数范围较小（Re_j≤1155）时，模型1产生了抵消效果（正向喷射和自然对流的方向相反）和增强效果（对流壁射流与自然对流横向相交）同时产生对流。当c / d增加时（例如c / d = 11），由于射流的扩散作用而产生了较大的前向碰撞接触面积，并且模型1的强制对流和自然对流的抵消作用更为显着。模型2形成了混合对流换热的增强效果。当Re_j较小时，模型2的Nu大于模型1。当Re_j≥2105时，两个模型的Nu相似，并且随Or不变。 ，意味着整体传热主要由强制对流控制。最后，本研究建立了模型1和模型2在不同c / d下以Re_j和Gr表示的混合对流经验Nu相关性，适用于传热分析和合成射流装置的优化设计。

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