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中南大学学报(自然科学版)

Journal of Central South University

第51卷    第1期    总第305期    2020年1月

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文章编号:1672-7207(2020)01-0231-08
结霜初期超疏水表面液滴生长的规律
赵伟,梁彩华,成赛凤,罗倩妮

(东南大学 能源与环境学院,江苏 南京,210096)

摘 要: 为了研究结霜初期液滴在超疏水表面的生长规律,建立结霜初期超疏水表面液滴生长的分层模型,揭示液滴在生长过程中各层温差的分布特点,并深入研究表面接触角、面积分数、基底温度以及空气相对湿度对液滴生长的影响规律。研究结果表明:在结霜初期,液滴的Knudsen层以及主流连续区层这2部分的温差占基底过冷度的95%以上;随着表面接触角的增大,传质环节中的主流连续区层的温差减小,导致液滴生长减缓;面积分数S对液滴生长的影响较小,当S=0.04时,与其相关的热阻Rwe仅约占液滴-翅片层总热阻的0.2%;液滴生长速率随着基底温度的降低和空气相对湿度的升高而升高。

 

关键词: 超疏水表面;液滴生长;接触角;面积分数

Rule of droplets growth in the early stage of frost formation on superhydrophobic surfaces
ZHAO Wei, LIANG Caihua, CHENG Saifeng, LUO Qianni

School of Energy and Environment, Southeast University, Nanjing 210096, China

Abstract:In order to study the droplets growth on the superhydrophobic surfaces in the early stage of frost formation, the model of droplets growth under frosting conditions was established. The proportion of the temperature difference of each layer in the droplets growth process was analyzed. The effects of contact angle, area fraction, substrate temperature and relative humidity on droplets growth were studied. The results show that in the early stage of frost formation, the temperature difference of the Knudsen layer and the continuum region layer account for more than 95% of the total temperature difference. With the increase of surface contact angle, the temperature difference of continuum region layer decreases, which leads to the slow growth of droplets. The area fraction S has little effect on the droplets growth. When S=0.04, the related thermal resistance Rwe only accounts for about 0.2% of the total thermal resistance of the droplet-fin layer. The rate of droplets growth increases as the substrate temperature decreases and the relative humidity of the air increases.

 

Key words: superhydrophobic surfaces; droplets growth; contact angle; area fraction

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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