液滴偏移撞击曲面的传热特性  

Heat transfer characterzistics of droplet offset impact on curved surface

作　　者：张子涵 王帅 田丽亭[1] ZHANG Zihan;WANG Shuai;TIAN Liting(School of Energy and Environmental Engineering,Hebei University of Technology,Tianjin 300401,China)

机构地区：[1]河北工业大学能源与环境工程学院,天津300401

出　　处：《河北工业大学学报》2024年第6期78-85,共8页Journal of Hebei University of Technology

基　　金：国家自然科学基金资助项目(52176067)。

摘　　要：针对目前多液滴偏移撞击曲面的研究相对较少的情况,采用三维瞬态数值模拟方法,对比分析了单、双液滴垂直及偏移撞击的液滴动力学及传热特性,研究了双液滴不同排列方式对撞击曲面的影响。结果表明:偏移撞击会导致液膜在偏移侧堆积,垂直撞击更有利于液膜在曲面两侧均匀铺展,单液滴垂直撞击比偏移撞击的峰值热流量提高了18.9%;双液滴轴向排列的铺展更加均匀,其无量纲铺展面积和热流量比周向排列最高相差0.7和11.7W;偏移量对传热系数的影响较大,而液滴排列方式对传热系数的影响较小。液滴无量纲铺展面积和热流量的峰值并不同步达到,增加液滴数量会导致液膜铺展速率降低,加剧铺展面积的峰值滞后性。Aiming at addressing the relatively limited research on the offset impact of multiple droplets on the curved surface,this paper compares and analyzes the droplet dynamics and heat transfer characteristics of vertical and offset impacts of single and double droplets using a three-dimensional transient numerical simulation method,and the in-fluence of different arrangements of double droplets on the impact surfaces is also investigated.The results show that the offset impact leads to liquid film accumulation on the offset side,the vertical impact promotes the uniform spreading of the liquid film on both sides of the curved surface,and the peak heat flux of single droplet vertical impact is 18.9%higher than that of offset impact.The spreading of the double droplets in the axial arrangement is more uniform,and its dimensionless spreading area and heat flux are up to 0.7 and 11.7 W higher than those of the circumferential arrange-ment,respectively.The offset has a greater impact on the heat transfer coefficient,while the droplet arrangement has a smaller effect.The peak values of the dimensionless spreading area and heat flux of the droplets do not reach simultane-ously,and increasing number of droplets slows the spreading rate of the liquid film,exacerbating the lag of the peak spreading area.

关 键 词：多液滴 偏移撞击 液滴动力学 数值模拟 传热 

分 类 号：TK124[动力工程及工程热物理—工程热物理] O353.4[动力工程及工程热物理—热能工程]