Contact angle measurements in the refrigerant falling film evaporation process

Contact angle measurements in the refrigerant falling film evaporation process
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制冷剂降膜蒸发过程中的接触角测量

DOI:
10.1016/j.ijrefrig.2019.12.017
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发表时间:
2020-04
影响因子:
3.9
通讯作者:
Chen Jianxun
Chen Jianxun
中科院分区:
工程技术2区
文献类型:
--
作者:
Li Guoli;Liu Jinping;Xu Xiongwen;Lu Xingbin;Chen Jianxun

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细流是制冷剂降膜蒸发过程中一种常见的流动形式。本文设计了一个可视化制冷循环系统,用于观察R134 a的蒸发流动特性。使用配备有电荷耦合器件(CCD HV 1351 UM)的照相机获得液膜的横截面轮廓,之后通过边缘检测技术和在过热条件(0.2-1.8° C)下的圆拟合测量接触角。在图像拟合过程中,选择具有最大确定系数(R 2)的像素进行拟合。数据表明,接触角随着壁面粗糙度的增加而增加,因为壁面粗糙度的增加加剧了接触线处的蒸发。总之,我们表明,测得的接触角接近曲线,θ= 12。12 Δ T 0. 343.
Rivulet is a very common form of flow during the refrigerant falling film evaporation process. In this work, a visual refrigeration cycle system is designed to observe the evaporative flow characteristics of R134a. The cross-sectional profile of the liquid film is obtained using a camera equipped with a charge-coupled device (CCD HV1351UM), after which the contact angle is measured by an edge detection technique and circle fitting under superheated conditions (0.2–1.8° C). In the image fitting process, the pixels with the largest coefficient of determination (R 2) are selected for fitting. The data show that the contact angle increases with the wall superheat because the increase in the wall superheat intensifies the evaporation at the contact line. In conclusion, we show that the measured contact angles lie close to the curve, θ= 12. 12 Δ T 0. 343.
DOI: 10.1016/j.ijrefrig.2015.10.033
发表时间: 2016-02
期刊: International Journal of Refrigeration-revue Internationale Du Froid
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