Frost formation on a plate with different surface hydrophilicity
Frost formation on a plate with different surface hydrophilicity
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DOI：
10.1016/j.ijheatmasstransfer.2004.05.021
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发表时间：
2004-10
影响因子：
5.2
通讯作者：
Hyun-Uk Lee;Jong-Min Shin;S. Ha;Bong-Jun Choi;Jae-Keun Lee
中科院分区：
文献类型：
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作者：
Hyun-Uk Lee;Jong-Min Shin;S. Ha;Bong-Jun Choi;Jae-Keun Lee
本研究的目的是为具有两种不同亲水特性的两个不同表面开发霜冻图，并找到与霜结构形成相关的环境条件。将具有动态接触角 (DCA) 分别为 23° 和 88° 的两个不同表面的测试样品安装在风洞中并暴露于潮湿气流中。使用可视化系统观察家用冰箱的运行条件：气流温度在+10~20℃范围内，湿度在2.64~9.36g/kg′范围内，雷诺数在7000~17,000范围内，冷板温度在-11.6~-28.4℃范围内。作为这项研究的结果，对霜结构进行了分类，并针对两种不同的表面亲水性提出了霜图。低 DCA (23°) 的表面比高 DCA (88°) 的表面显示出更低的霜厚度和更高的霜密度。结果发现，具有不同 DCA 的表面上的霜结构相似。然而，由于不同结构区域的移动，低湿度下的低 DCA 表面会导致结霜密度增加 20-30%。
The objectives of this study are to develop frost maps for two different surfaces having two different hydrophilic characteristics and to find ambient conditions associated with the formation of frost structures. Test samples with two different surfaces having dynamic contact angle (DCA) of 23° and 88° were installed in a wind tunnel and exposed to a humid airflow. Frost structure is observed with a visualization system in the operating conditions of household refrigerator: airflow temperature in the range of +10–20 °C, humidity in the range of 2.64–9.36 g/kg′, Reynolds number in the range of 7000–17,000 and cold plate temperature in the range of −11.6 to −28.4 °C. As results of this study, frost structures are classified and frost maps are proposed for two different surface hydrophilicities. Surface with low DCA (23°) shows lower frost thickness and higher frost density than that with high DCA (88°). It was found that frost structures on surfaces with different DCA are similar. However, low DCA surface at low humidity provides 20–30% denser frost formation due to the shift of areas with different structures.