Indexed by:期刊论文
Date of Publication:2022-06-30
Journal:Huagong Xuebao/CIESC Journal
Volume:72
Issue:11
Page Number:5510-5519
ISSN No.:0438-1157
Abstract:HFE-7100/water as a non-azeotropic and immiscible working medium can broaden the effective temperature range of nucleate boiling heat transfer. At present, it is not clear about its boiling heat transfer characteristics and bubble movement mechanism on the micro-nano composite surface. In this paper, a hierarchical micro/nano structured surface composed of nano-particles and micro-holes was fabricated by the bubble-template-assisted electro-deposition method. Surface wettability and bubble dynamics during the boiling refrigerant transition (BRT) were investigated to clarify the heat transfer characteristics of HFE-7100/water boiling on the hierarchical micro/nano structured surface. The results show that the bubbles experience the small bubbles coalescence, gas film expansion and water nucleates on the heated surface at the BRT of HFE-7100/water. During the BRT process, there is a competition of liquid wetting between HFE-7100 and water on the surface. With the increase of superheat, stable nucleate boiling of thin HFE-7100 layer is broken and the upper water fluid can pass through the HFE-7100 layer to wet the heated surface, completing the BRT process. Compared with single liquid boiling, the HFE-7100/water boiling widens the effective temperature range of 343-423 K. This work clarifies the boiling heat transfer characteristics of HFE-7100/water on the hierarchical micro/nano structured surface and provides guidelines for structure design of enhanced heat transfer surfaces. © 2021, Editorial Board of CIESC Journal. All right reserved.
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