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International Heat Transfer Conference 15

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

Applying Phase Separation of a Solvent System with a Lower Critical Solution Temperature for Enhancement of Cooling Rates by Forced and Free Convection

Amos Ullmann
School of Mechanical Engineering The Iby and Aladar Fleischman Faculty of Engineering Tel Aviv University Ramat Aviv 69978 ISRAEL

Itay Lipstein
School of Mechanical Engineering, Tel-Aviv University

Neima Brauner
School of Mechanical Engineering The Iby and Aladar Fleischman Faculty of Engineering Tel Aviv University Ramat Aviv 69978 ISRAEL

DOI: 10.1615/IHTC15.hte.008983
pages 4383-4397


KEY WORDS: Convection, Heat transfer enhancement, spinodal decomposition, convective heat transfer, free convection, phase separation, enhancement

Abstract

Phase separation of non-ideal solvent system is used for augmentation of the convective single-phase heat transfer rates. A mixture of water and triethylamine with a lower critical solubility temperature is used as a heat sink. It was found that phase separation can enhance significantly the forced convection heat transfer in small diameter pipes (by a factor of up to 7), and the heat transfer coefficient is by a factor of up to 5 larger than that of water with the same volumetric flow rate. Using the same solvent system and inducing phase separation on a hot vertical plate result in augmentation of the free-convection heat transfer rates by a factor of up to 3. Visualization of the flow field near the plate during the phase separation enables to associate the heat transfer augmentation to the observed flow phenomena.

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