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International Heat Transfer Conference 16

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

SIMULATION OF HEAT TRANSFER IN THE CONTACT LINE REGION OF PURE PENTANE AND PENTANE/HEXANE MIXTURE IN A CLOSED MICROCAVITY

Xinghui Wu
Key Laboratory for Thermal Science and Power Engineering of MOE, Beijing Key Laboratory for CO2 Utilization and Reduction Technology, Tsinghua University, Beijing 100084, China

Zhen Yang
Key Laboratory for Thermal Science and Power Engineering of MOE, Beijing Key Laboratory for CO2 Utilization and Reduction Technology, Tsinghua University, Beijing 100084, China

Bengt Sunden
Division of Heat Transfer, Department of Energy Sciences, Lund University, P.O. Box 118, SE-22100, Lund, Sweden

Yuanyuan Duan
Key Laboratory for Thermal Science and Power Engineering of MOE, Beijing Key Laboratory for CO2 Utilization and Reduction Technology, Tsinghua University, Beijing 100084, China

DOI: 10.1615/IHTC16.cms.023111
pages 1945-1955


KEY WORDS: computational fluid dynamics, multiphase, nano/micro? meniscus, binary mixture

Abstract

Understanding the heat transfer characteristics in the three-phase contact line region has great significance in achieving efficient evaporation/condensation. Phase change becomes especially complicated when a fluid mixture is used. The dynamics of phase change heat and mass transfer in the three-phase contact line region of binary fluid is still not clear. Based on the volume of fluid (VOF) model and the continuum surface force (CSF) model, the heat transfer characteristics of pure pentane and a pentane/hexane mixture in the contact line region of a closed microcavity was numerically investigated. The VOF model is used with source terms added by user defined functions (UDF). A thermal equilibrium model assuming the interface temperature is at saturation was adopted. The effects of fluid properties, contact angle and superheat on heat transfer in the contact line region were discussed. By comparing the heat transfer flux under different conditions, the heat transfer characteristics in the contact line region were investigated. The results indicate that the heat transfer capability of pentane/hexane mixture is superior to pure pentane in the contact line region. The contribution by contact line region to heat transfer rate increases substantially as the wettability and superheat of the binary fluid increases. The thin film profile, interfacial temperature, mass flux and integrated heat transfer near the contact line was also presented.

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