Heat transfer during droHeat transfer during droplet impact on a cold superhydrophobic surface via interfacial thermal mappingplet impact on a cold superhydrophobic surface via interfacial thermal mapping

作     者：Vijay Kumar Qianxi Fu Harrison Szeto Yangying Zhu 

作者机构：Department of Mechanical EngineeringUniversity of California Santa BarbaraSanta BarbaraCaliforniaUSA Department of Chemistry and BiochemistryUniversity of California Santa BarbaraSanta BarbaraCaliforniaUSA 

出 版 物：《Droplet》 (液滴（英文）)

年 卷 期：2024年第3卷第3期

页      面：71-79页

核心收录：

学科分类：080704[工学-流体机械及工程] 080103[工学-流体力学] 08[工学] 0807[工学-动力工程及工程热物理] 0801[工学-力学（可授工学、理学学位）] 

基　　金：National Science Foundation,Grant/Award Number:2047727 Office of Naval Research,Grant/Award Number:N00014-24-1-2086 

主　　题：surface. hydrophobic transfer 

摘      要：Undesired heat transfer during droplet impact on cold surfaces can lead to ice formation and damage to renewable infrastructure,among *** address this,superhydrophobic surfaces aim to minimize the droplet surface interaction thereby,holding promise to greatly limit ***,the dropletimpact on such surfaces spans only a few milliseconds making it difficult to quantify the heat exchange at the droplet–solid ***,we employ high-speed infrared thermography and a three-dimensionaltransient heat conductionCOMSOL modelto map the dynamic heat flux distribution during droplet impact on a cold superhydrophobic *** comprehensive droplet impact experiments for varying surface temperature,droplet size,and impacting height reveal that the heat transfer effectiveness(Q′)scales with the dimensionless maximum spreading radius as Q′∼(Rmax∕Ri)1.6,deviating from previous semi-infinite ***,despite shorter contact times,droplets impacting from higher heights demonstrate increased heat transfer effectiveness due to expanded contact *** results suggest that reducing droplet spreading time,as opposed to contact time alone,can be a more effective strategy for minimizing heat *** results presented here highlight the importance of both contact area and contact time on the heat exchange between a droplet and a cold superhydrophobic surface.