Experimental Research for Freezing Characteristics of Droplets Impacting on Supercooled Surface

doi:10.7652/xjtuxb202110016

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Experimental Research for Freezing Characteristics of Droplets Impacting on Supercooled Surface

更新时间：2025-07-09

- Experimental Research for Freezing Characteristics of Droplets Impacting on Supercooled Surface
- Vol. 55, Issue 10, Pages: 144-149(2021)
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb202110016
  CLC： TK121
- Online First：10 October 2021，
  
  Published：2021
- 稿件说明：
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Experimental Research for Freezing Characteristics of Droplets Impacting on Supercooled Surface[J]. 2021, 55(10): 144-149.
DOI：

Experimental Research for Freezing Characteristics of Droplets Impacting on Supercooled Surface[J]. 2021, 55(10): 144-149. DOI： 10.7652/xjtuxb202110016.

摘要

为了研究液滴动态铺展特性以及冻结行为和机理

基于可视化实验平台

探究了壁面温度对液滴动态结冰过程的影响

分析了铺展直径随时间的变化规律和不同冰型形成的物理机制。实验中采用亲水硅片以及较大的撞击速度增加换热面积

同时采用较低的壁面温度强化液体与冷板之间的换热过程。结果表明

壁温降低导致液滴黏性耗散增加

液滴最大铺展直径略有减小

但壁面温度对于动态铺展阶段的影响不大; 壁面温度对结冰过程的影响十分显著

不同的壁面过冷度可产生不同结冰形态; 当壁面温度相对较高时

液滴呈现中间成尖结冰形态

壁面温度较低时

出现了一种新的内凹环状结冰形态

后者的形成是由于触发了液膜内部结冰

从而导致液膜内出现冻结锋面

且该锋面同时向外、向上发展。另外

本研究提出了无量纲导热因子以反映壁面导热性能的影响

通过结合无量纲导热因子和韦伯数的影响

揭示了不同冰型产生的条件

为控制结冰形态提供了新的策略。

Abstract

To enrich the understanding of droplet spreading dynamics and the mechanism of freezing behavior

the role of surface temperature in influencing the droplet freezing process is investigated experimentally by a high-speed camera. The evolution of spreading diameter and the physical mechanism of different freezing patterns are analyzed. A hydrophilic silicon wafer and a relatively high impact velocity are chosen to enlarge the contact area between the droplet and substrate. Along with a high surface subcooling

the heat transfer rate through the droplet is enhanced. Upon increasing the surface subcooling

the maximum spreading diameter slightly decreases due to a relatively larger viscous dissipation. The effect of surface temperature on the spreading process is relatively smaller compared with the freezing process. The final freezing morphology is a central cap at a relatively high surface temperature

while a unique single-ring pattern is formed at a relatively low surface temperature. The formation of the single-ring icing is attributed to the ice nucleation at the central region induced by the enhanced heat transfer rate

resulting in an additional freezing front advancing both outwards and upwards during the freezing process. A freezing regime map described by the dimensionless heat conduction rate and Weber number indicating the conditions for the emergence of different ice profiles are proposed. This approach provides new insights for controlling ice profiles in droplet-based applications.

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references

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