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, Itay Lipstein, Neima Brauner

Research output: Contribution to conferencePaperpeer-review

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.

Original languageEnglish
DOIs
StatePublished - 2014
Event15th International Heat Transfer Conference, IHTC 2014 - Kyoto, Japan
Duration: 10 Aug 201415 Aug 2014

Conference

Conference15th International Heat Transfer Conference, IHTC 2014
Country/TerritoryJapan
CityKyoto
Period10/08/1415/08/14

Keywords

  • Convection
  • Heat transfer enhancement
  • Multiphase
  • Non-ideal solutions
  • Spinodal decomposition

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