Abstract

Two-phase and two-component flows in microchannels being very promising for applications in areas such as microfluidics, microelectronic cooling, and heat exchange systems, there is a need to study characteristics of these flows and new effects associated with microchannel flows. This work presents an experimental and theoretical study of waves in stratified and annular flow regimes for a flat slit microchannel 104 \(\mu\)m high and 10 mm wide, with isopropanol used as a working liquid and nitrogen used as a gas. The lengths of waves appearing on the film on the lower wall of the microchannel were measured experimentally. Quantitative dependences of the wavelengths on the liquid and gas flow rates were obtained. A numerical calculation was performed using analysis of linear stability. The experimental data on the wavelengths were compared with the results of numerical calculations for wavelengths of maximum growth. Dependences of the averaged distances of transitions from 2D to 3D waves on the Reynolds numbers of the liquid and gas were obtained experimentally. Dependences of the maximum spatial rate of perturbation growth on the Reynolds numbers of the liquid and gas were found numerically and experimentally.

中文翻译：

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狭缝微通道中绝热两相流的液膜状态中的波

摘要

微通道中的两相和两组分流对于在微流控，微电子冷却和热交换系统等领域的应用非常有前途，因此有必要研究这些流的特性以及与微通道流相关的新影响。这项工作提出了对平缝微通道104 \（\ mu \）的分层和环形流动状态下的波的实验和理论研究 高度为10毫米，宽度为10毫米，使用异丙醇作为工作液体，使用氮气作为气体。实验测量了在微通道下壁上的膜上出现的波的长度。获得了波长对液体和气体流速的定量依赖性。使用线性稳定性分析进行了数值计算。将有关波长的实验数据与最大生长波长的数值计算结果进行了比较。通过实验获得了从2D到3D波的平均跃迁距离对液体和气体的雷诺数的依赖性。从数值和实验上发现了最大扰动增长的空间速率对液体和气体的雷诺数的依赖。