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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Surface wettability effect on flow pattern and pressure drop in adiabatic two-phase flows in rectangular microchannels with T-junction mixer
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Surface wettability effect on flow pattern and pressure drop in adiabatic two-phase flows in rectangular microchannels with T-junction mixer

机译：T型结混合器对矩形微通道绝热两相流中表面润湿性的影响及流型和压降

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摘要

Wettability is an important parameter in micro-scale flow patterns. Previous research has usually been conducted in conventional microtubes due to limitations of visualizing flow patterns and fabricating microchannels. However, most microchannels in practical applications have rectangular shape. Furthermore, pressure drop is closely related with flow pattern. Hence, we studied water liquid and nitrogen gas flows in rectangular microchannels with different wettabilities. The rectangular glass microchannels were fabricated from photosensitive glass, whose surface is hydrophilic. The surface of one was silanized using octadecyl-trichloro-silane (OTS) to prepare a hydrophobic microchannel. The two-phase flow pattern was visualized with a high-speed camera and a long distance microscope. The frictional pressure drop in the microchannel was measured directly with embedded pressure ports. The flow pattern and pressure drop in the hydrophobic microchannel were totally different from those in the hydrophilic microchannel. Finally, the two-phase frictional pressure drop was analyzed based on the flow patterns of different wettabilities.
机译：润湿性是微尺度流型中的重要参数。由于可视化流型和制造微通道的限制，通常在常规微管中进行了先前的研究。然而，在实际应用中，大多数微通道具有矩形形状。此外，压降与流动模式密切相关。因此，我们研究了具有不同润湿性的矩形微通道中的水液和氮气流。矩形玻璃微通道由表面亲水的光敏玻璃制成。使用十八烷基三氯硅烷（OTS）对一个表面进行硅烷化处理，以制备疏水性微通道。用高速照相机和长距离显微镜观察两相流动模式。直接在嵌入式压力端口中测量微通道中的摩擦压降。疏水微通道中的流型和压降与亲水微通道中的流型和压降完全不同。最后，根据不同润湿性的流型分析了两相摩擦压降。

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