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混入了矿物润滑油的制冷剂R134a,流经带有空化结构的微通道,发生了沸腾-空化耦合相变现象。无氧铜铜板上刻有长150 mm宽0.8 m深1 mm的微通道,微通道内置有长4 mm宽0.2mm的矩形空化结构。铜板上面覆盖有玻璃片。观察测量不同流量及不同加热量下通道内的流形及通道背面温度。实验结果表明:润滑油抑制了相变现象的发生,降低了换热效率;工作介质为混入润滑油的制冷剂时,通道背面温度远高于工作介质为纯净制冷剂时的通道背面温度。
Mixed with mineral oil refrigerant R134a, flows through the microchannels with cavitation structure, the boiling-cavitation coupling phase transition occurs. Oxygen-free copper and copper engraved with a long 150 mm wide and 0.8 m deep 1 mm microchannels, microchannels built-in long 4 mm wide 0.2mm rectangular cavitation structure. Copper plate covered with glass. Observe and measure the manifolds and the temperature of the back of the channels under different flow rates and different heating levels. The experimental results show that the lubricant inhibits the phase transition and reduces the heat transfer efficiency. When the working medium is a refrigerant mixed with lubricating oil, the temperature at the back of the passage is much higher than the temperature at the back of the passage when the working medium is pure refrigerant.