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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Carbon dioxide flow boiling in a single microchannel - Part I: Pressure drops
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Carbon dioxide flow boiling in a single microchannel - Part I: Pressure drops

机译：单个微通道中沸腾的二氧化碳流-第一部分：压降

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Carbon dioxide two-phase flow pressure drops have been investigated in a single horizontal stainless-steel micro-tube having a 0.529mm inner diameter. Experiments were carried out in adiabatic conditions for four saturation temperatures of -10; -5; 0; 5°C and mass fluxes ranging from 200 to 1400kg/m2s, for inlet qualities up to unity. Measurements have been compared to the predictions of well-known methods. The Müller-Steinhagen and Heck correlation and the Friedel correlation gave the best fit as well as the homogeneous model when the liquid viscosity is used to represent the apparent two-phase viscosity. Further, an analysis based on the homogeneous model has not shown any clear appearance of the laminar or the transition regimes in any given range of Reynolds number. The apparent viscosity of the two-phase mixture was found larger than the liquid viscosity at low vapour qualities, namely at the lowest temperatures. Hence, a new expression to determine the equivalent viscosity was suggested as a function of the reduced pressure. Lastly, the Chisholm parameter from the Lockhart-Martinelli correlation was found lower than expected and also mainly dependent on the saturation temperature.
机译：在具有0.529mm内径的单个水平不锈钢微管中研究了二氧化碳的两相流压降。实验是在绝热条件下对四个饱和温度-10进行的。 -5; 0; 5°C和200至1400kg / m2s的质量通量，入口质量达到统一。将测量结果与已知方法的预测结果进行了比较。当使用液体粘度表示表观两相粘度时，Müller-Steinhagen和Heck相关性以及Friedel相关性提供了最佳拟合以及均质模型。此外，基于均质模型的分析未显示任何给定范围的雷诺数的层流或过渡态的任何清晰外观。发现两相混合物的表观粘度大于在低蒸气质量即最低温度下的液体粘度。因此，提出了确定当量粘度的新表达式，作为减压的函数。最后，根据洛克哈特-马丁内利相关性得出的Chisholm参数低于预期，并且主要取决于饱和温度。

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