论文标题
通过结合表面结构和混合润湿性的效果来增强成核沸腾的沸腾：晶格鲍尔茨曼研究
Enhancement of nucleate boiling by combining the effects of surface structure and mixed wettability: A lattice Boltzmann study
论文作者
论文摘要
近年来，微观结构和混合润湿性的结合吸引了很多关注。但是，在现有的实验和数值研究中，微观结构的顶部完全受到润湿性修改，这使得混合润湿性的影响取决于微观结构的特征长度。为了披露表面结构的关节作用和混合润湿性对成核沸腾性的影响，在这项工作中，我们提出了一种具有混合润湿性的改进类型的柱状纹理表面，其中方柱的顶部部分进行了可润滑性修改。使用三维纵向多相晶格Boltzmann模型对改进的混合润湿性表面上沸腾传热性能进行数值研究。 The numerical results show that the width of the wettability-modified region plays an important role in the boiling performance of the improved mixed-wettability surface and the best boiling performance is achieved in the situation that the width of the wettability-modified region is sufficiently large but the bubble nucleated on the pillar top still does not interfere with the coalescence-departure mechanism of the bubbles nucleated around the pillar, which optimizes the joint effects of表面结构和混合润湿性，以增强成核沸腾。还研究了润湿性修饰区域形状的影响。在研究的形状中，发现正方形的性能比其他两个形状更好。
The combination of microstructures and mixed wettability for enhancing nucleate boiling has attracted much attention in recent years. However, in the existing experimental and numerical studies, the tops of microstructures are entirely subjected to wettability modification, which makes the influences of mixed wettability dependant on the characteristic length of microstructures. In order to disclose the joint effects of surface structure and mixed wettability on nucleate boiling, in this work we propose an improved type of pillar-textured surface with mixed wettability, in which the tops of square pillars are partially subjected to wettability modification. Numerical investigation of the boiling heat transfer performance on the improved mixed-wettability surface is carried out using a three-dimensional thermal multiphase lattice Boltzmann model. The numerical results show that the width of the wettability-modified region plays an important role in the boiling performance of the improved mixed-wettability surface and the best boiling performance is achieved in the situation that the width of the wettability-modified region is sufficiently large but the bubble nucleated on the pillar top still does not interfere with the coalescence-departure mechanism of the bubbles nucleated around the pillar, which optimizes the joint effects of surface structure and mixed wettability for enhancing nucleate boiling. The influences of the shape of the wettability-modified region are also studied. Among the investigated shapes, the square is found to perform better than the other two shapes.
