实验研究了氮气-水和氮气-CMC溶液在不同宽度微通道内的压力降和流型的变化，分析了气液流速比和无量纲数等条件对压力降和气泡长度的影响。结果表明，流速和溶液浓度越大，微通道宽度越小，压力降越大。气液两相流中，随着气液流速比的增加，压力降呈指数下降。对分相流压力降模型进行修正后，其预测值与实验结果间误差为-13.64%~17.41%。通过对气泡横截面面积的精确计算，对气泡长度预测模型进行了修正，气泡长度模型预测值与实验气泡长度间的误差除个别点外均小于20%。微通道中气体-非牛顿流体两相流压力降和气泡长度的预测可为微流控系统设计提供参考依据。

The variation of pressure drop and flow pattern of nitrogen-water and nitrogen-CMC solutions in microchannels with different widths were experimentally studied, the effects of gas-liquid flow rate ratio and dimensionless number on pressure drop and bubble length were analyzed. The results show that the larger the flow rate and solution concentration, the smaller the microchannel width and the greater the pressure drop. In gas-liquid two-phase flow, the pressure drop decreases exponentially with the increase of gas-liquid flow rate ratio. After correcting the pressure drop model of separated phase flow, the error between the predicted value and the experimental result is -13.64%~17.41%. The bubble length prediction model is modified by accurate calculation of the bubble cross sectional area, and the error between the predicted value of the bubble length model and the experimental bubble length is less than 20% except for individual points. The prediction of pressure drop and bubble length of gas-nonNewtonian fluid two-phase flow in microchannel can provide design reference for microfluidic system.