利用红外对管进行无干扰气泡上升速度测量的实验研究

采用红外对管作为测量手段,对空气气泡在去离子水、质量分数为10%的氯化钠水溶液、质量分数为5%以及10%的酒精水溶液中的上升速度进行了实验研究.实验结果与Mendelson经验公式以及Harmathy经验公式的预测值相比,误差小于15%,与数码摄像法的实测值吻合良好.该法具有设备简单,操作方便,成本低廉,对流体物性无影响,不干扰气泡的上升过程等特点,特别适宜测试毛细管等微管内气泡(气弹)的上升速度,是研究毛细管传热及微通道气液两相流动力学的较好方法.

Experimental Study on Undisturbed Measurement of Gas Bubble Rising Velocity Using Infrared Emitting Diode and Photodiode

Infrared emitting diode and photodiode was used as the measuring method of the rising velocity of air bubbles. And the rising velocities of air bubbles in de-ionized water, 10% sodium chloride solution, 5% alcoholic solution, and 10% alcoholic solution were measured with this method. It is found that the deviation of the test data by this method from the predicted values by relation of Mendelson and Harmathy is less than 15%, and the test data well agree with measured results by the digital camera. The low-cost, easy-to-use and non-effect to liquid physical properties and undisturbed the rising of bubbles are the characteristics of this method. It is especially suitable for the bubble (slug) speed measurements in capillaries and so on. It is also a very good method in the study on heat transfer of capillaries and dynamics of microchannel gas-liquid flow.