【摘要】 核态沸腾是一种高效的热量传递方式，在工程技术领域得到广泛应用，也是传热学科的研究热点之一。利用格子Boltzmann方法研究了矩形和倒三角形结构表面上双气泡动力学特性，同时分析了表面润湿性对气泡动力学行为的影响。研究结果表明，倒三角形结构表面对气泡的成核、生长、聚并和脱离过程更为有利。在气泡初始成核阶段，热流密度达到峰值的时刻随着接触角的增大而逐渐增大。当双气泡的成核位置间距D=70格子单位时，双气泡在疏水表面发生聚并后会逐渐将成核位置间的表面覆盖，进而气泡从气膜上发生周期性地生长和脱离。对于亲水表面，双气泡虽能发生聚并，但是气泡聚并脱离后留存的汽化核心不能将两个成核位置间的表面覆盖，并且气泡连续地脱离导致在成核位置处留存的汽化核心不断减小，最终仍是以双气泡单独地生长和脱离的形式进行换热。更多还原

【Abstract】 Nucleate boiling is an efficient way of heat transfer, which is widely used in engineering. In this paper, the lattice Boltzmann method is used to investigate the dynamics of double bubbles on the rectangular and inverted triangular structured surfaces, and the effect of surface wettability on the dynamics of double bubbles is also analyzed. The results show that the inverted triangular structure surface is more beneficial to the nucleation, growth, coalescence, and release of bubbles. When the distance of two nucleation sites is D=70 lattice units, the bubble gradually covers the surface between the nucleation sites after the double bubbles coalescence on the hydrophobic surface, and then the bubble grows and release periodically from the gas film. While for the hydrophilic surface, the gasification core cannot cover the surface between the two nucleation sites after the bubbles coalescence and release from the structured surface, and the continuous release of the bubbles leads to the decrease of remaining gasification cores at the nucleation sites. Finally, the heat transfer is still carried out at two nucleation sites separately.更多还原