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为了研究多孔槽道几何参数对多孔表面沸腾换热性能的影响 ,从分析多孔结构内微液膜蒸发和气液两相流的机理出发 ,借鉴微热管的研究方法 ,建立了描述多孔表面沸腾换热的细观动态模型。通过对沸腾起泡点分布的简化处理 ,进行了数值求解 ,计算结果与已有文献的实验数据一致。计算结果还表明 :对于微液膜换热 ,存在最佳液膜厚度 ,使液膜换热热阻最小。利用该模型 ,导出了多孔表面在常用沸腾工质中沸腾换热时的结构优化参数。这一模型对多孔表面微细结构的尺寸优化有理论指导作用
In order to study the influence of the geometric parameters of porous channels on the boiling heat transfer performance of porous surfaces, starting from the analysis of the mechanism of micro-liquid film evaporation and gas-liquid two-phase flow in porous structure, Micro-dynamic model. Through the simplified treatment of the boiling bubble point distribution, the numerical solution is carried out. The calculation results are consistent with the experimental data of the existing literature. The calculation results also show that: for the micro-liquid membrane heat transfer, there is the optimal liquid film thickness, the thermal resistance of the liquid film is the smallest. Using this model, the structural optimization parameters of the porous surface boiling and exchanging heat in common boiling medium were derived. This model can theoretically guide the size optimization of the fine structure of porous surface