中文摘要：

窄小流道内的两相流动压降不同于常规流道,在窄小空间内的受限气泡行为对流动稳定性有着重要影响。本文在1个标准大气压（0.101 MPa）下,对内径为2 mm的窄小流道内气-液两相流动进行可视化实验研究。实验在不同工况参数和气相工质下展开,其中气相工质包括氮气、空气、二氧化碳和氩气,液相工质为水。研究发现,在给定气相体积流量下,压降随液体质量流速增大而增加,对应的气-液界面形态均为拉长型气弹;而在给定液相质量流速下,压降随气相体积流量增加不成线性关系,是先减小后增大,对应的气-液界面形态仍为拉长型气弹。

英文摘要：

The pressure drop in the narrow space channel is different from that in the regular size channel, and the bubble behavior in confined narrow space has great influence on the flow stability. A visual investigation on the gas-liquid two-phase flow was carried out in a narrow space channel with 2 mm in diameter under atmospheric pressure （0.101 MPa）. Experiments were carried out with different working conditions and gas-phase working fluids, including air, carbon dioxide and argon. It is found that the pressure drop increases along with the increasing of liquid mass flux and constant gas flow rate, and the corresponding interface morphology is elongated slug flow. However, the pressure drop decreases at first and then increases along with the gas flow rate with constant liquid mass flux, and the corresponding interface morphology is still elongated slug flow.