| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Continuous droplet rebound on heated surfaces and its effects on heat transfer property: A lattice Boltzmann study |
| Qing-Yu Zhang(张庆宇)1, Qi-Peng Dong(董其鹏)1, Shan-Lin Wang(王山林)2, Zhi-Jun Wang(王志军)3, and Jian Zhou(周健)1,† |
| 1 Shagang School of Iron and Steel, Soochow University, Suzhou 215137, China; 2 State Key Laboratory of Environmental-Friendly Energy Materials, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621010, China; 3 State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China |
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Abstract A thermal multiphase lattice Boltzmann (LB) model is used to study the behavior of droplet impact on hot surface and the relevant heat transfer properties. After validating the correctness of the codes through the D2 law, the simulations of intrinsic contact angle and the temperature-dependent surface tension are performed. The LB model is then used to simulate the droplet impact on smooth and micro-hole heated surface. On the smooth surface, the impinging droplet is reluctant to rebound, unless the intrinsic wettability of the solid surface is fairly good. On the micro-hole surface, however, the micro-holes provide favorable sites for generating a high-pressure vapor cushion underneath the impinging droplet, which thereby facilitates the continuous droplet rebound. For the continuously rebounding droplet. The time evolution of volume and temperature display obvious oscillations. The achievable height of the rebounding droplet increases as the intrinsic wettability of the solid surface becomes better, and the maximum transient heat flux is found to be directly proportional to the droplet rebounding height. Within a certain time interval, the continuous rebounding behavior of the droplet is favorable for enhancing the total heat quantity/heat transfer efficiency, and the influence of intrinsic wettability on the total heat during droplet impingement is greater than that of the superheat. The LB simulations not only present different states of droplets on hot surfaces, but also guide the design of the micro-hole surface with desirable heat transfer properties.
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Received: 22 September 2020
Revised: 22 December 2020
Accepted manuscript online: 30 December 2020
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PACS:
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47.55.dr
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(Interactions with surfaces)
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68.03.Fg
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(Evaporation and condensation of liquids)
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44.35.+c
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(Heat flow in multiphase systems)
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47.61.Jd
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(Multiphase flows)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 51901148 and 51874204) and the Fund of the State Key Laboratory of Solidification Processing (Northwestern Polytechnical University), China (Grant No. SKLSP202006). |
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Corresponding Authors:
†Corresponding author. E-mail: jzhou@suda.edu.cn
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Cite this article:
Qing-Yu Zhang(张庆宇), Qi-Peng Dong(董其鹏), Shan-Lin Wang(王山林), Zhi-Jun Wang(王志军), and Jian Zhou(周健) Continuous droplet rebound on heated surfaces and its effects on heat transfer property: A lattice Boltzmann study 2021 Chin. Phys. B 30 044703
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