基于气液分离临界压差的T型通道设计模型

Design model of t-branch micro-channel based on the critical pressure difference of two-phase separation

中文关键词: T型微通道  弹状流  气液相分离  临界压差  数学模型

英文关键词: t-type microchannel  slug flow  gas-liquid phase separation  critical pressure difference  mathematical model

中文摘要:

      利用跨尺度T型通道实现两相流相分离可大幅度削弱相变热阻、提高弹状流相变换热性能，此气液分离调控的关键在于精准控制相分离压差。通过高速摄像以及压力测量系统同步监测T型微通道内弹状流相界面的运动以及主通道和分液支管通道的压力，定义实现液相分离的最大压差为临界压差，获得两相流流速(vl= 6-10 mL/min ,vg=6-15 mL/min)、通道尺寸(0.1、0.2、0.3 mm)对临界压差、压力波动及分液效果的影响规律；基于Ergun多孔材料内流动压降公式，以实现相分离的临界压差为依据，拟合相分离单孔结构参数设计模型，模型误差约为8%；此工作可为相分离高效相变换热器的结构设计及其工业应用提供指导。

英文摘要:

      The use of cross-scale T-type branch channel could significant reduce phase-change thermal resistance and improve the heat transfer performance of slug flows, and the key of phase-separating modulation lies in an accurate control of the pressure difference during the process. A high-speed camera monitoring system and a pressure monitoring system are used to respectively monitor the interface movement of the slug flow in the T-type microchannel and the pressure of the main and the liquid-separated channels. Companied with a critical pressure difference defined as the maximum pressure difference of realizing liquid-phase separation, the effects of two-phase flow velocity (vl=6-10 mL/min, vg=6-15 mL/min) and channel size (0.1, 0.2, 0.3 mm) on the critical pressure difference, pressure fluctuation and liquid separating effects were obtained. Furthermore, based on the Ergun`s equation on the flow pressure drop in monohole material and the demand of the critical pressure difference to phase separation, A mathematical design model on T-branch micro-channel and cases of two phase flow is suggested with an error about 8% which could provide a guidance for the future industrial application and structural design of high-efficiency phase-separating heat exchangers.