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首页> 外文期刊>International Journal of Heat and Fluid Flow >Locally heated shear-driven liquid films in microchannels and minichannels
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Locally heated shear-driven liquid films in microchannels and minichannels

机译：微通道和微通道中的局部加热剪切驱动液膜

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摘要

The flow of a locally heated liquid film moving under the friction of gas in a channel is considered through theoretical and numerical modeling and conducting experiments. Theoretical investigation predicts that at Re_1/Re_g < 0.35 the main driving force for the film is the friction at the liquid-gas interface. In experiments it was revealed that a liquid film driven by the action of a gas flow in a channel is stable in a wide range of liquid/gas flow rates. A map of isothermal flow regimes was plotted and the lengths of smooth region and region of 2D waves were measured. It was found that the critical heat flux at which an initial stable dry patch forms for a shear-driven liquid film can be several times higher than that for a vertical falling liquid film, which makes shear driven liquid films more suitable for cooling applications. Temperature distribution at the film surface was measured by an infrared scanner and it was found that thermocapillary tangential stresses may exceed tangential stresses caused by the friction of the gas, which indicates a significant Marangoni effect on the film dynamics.
机译：通过理论和数值建模以及进行实验，来考虑在通道中的气体摩擦下移动的局部加热的液膜的流动。理论研究预测，在Re_1 / Re_g <0.35时，薄膜的主要驱动力是液-气界面处的摩擦。在实验中发现，由通道中的气流的作用驱动的液膜在很宽的液/气流速范围内是稳定的。绘制等温流态图，并测量平滑区域和二维波区域的长度。已经发现，对于剪切驱动的液膜，形成初始稳定的干补丁的临界热通量可以比垂直下落的液膜的临界热通量高几倍，这使得剪切驱动的液膜更适合于冷却应用。用红外扫描仪测量薄膜表面的温度分布，发现热毛细切向应力可能超过气体摩擦引起的切向应力，这表明薄膜对薄膜动力学有明显的马兰戈尼效应。

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