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Heat and Mass Transfer

, Volume 51, Issue 1, pp 1–9 | Cite as

Local nucleation propagation on heat transfer uniformity during subcooled convective boiling

  • Beom Seok Kim
  • Gang Mo Yang
  • Sangwoo Shin
  • Geehong Choi
  • Hyung Hee Cho
Original

Abstract

Convective boiling heat transfer is an efficient cooling mechanism to dissipate amount of thermal energy by accompanying the phase transition of the working fluids. Particularly, the amount of heat dissipation capacity can be readily extensible by increasing the degree of subcooling due to initial demands requiring for coolant saturation. Under severely subcooled condition of 60°, we investigate boiling heat transfer phenomena regarding spatial heat transfer uniformity and stability on a planar surface. Severe subcooling can induce locally concentrated thermal loads due to poor spatial uniformity of the heat transfer. For reliable cooling, a high degree of spatial uniformity of the heat transfer should be guaranteed with minimized spatial deviation of heat transfer characteristics. Under pre-requisite safeguards below CHF, we experimentally elucidate the principal factors affecting the spatial uniformity of the heat transfer for a flow/thermal boundary layer considering heat transfer domains from a single-phase regime to a fully-developed boiling regime. Based on the local heat transfer evaluation, we demonstrate that full nucleation boiling over the entire heat transfer surface under subcooling conditions is favorable in terms of the uniformity of heat dissipation through the phase-change of the working fluid.

Keywords

Heat Transfer Heat Transfer Performance Local Heat Transfer Boiling Heat Transfer Boiling Regime 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

This work was supported by a National Research Foundation of Korea (NRF) Grant funded by the Korea government (MEST) (No. 2011-0017673) and the Human Resources Development program (No. 20134030200200) of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) Grant funded by the Korea government Ministry of Trade, Industry and Energy. The author B. S. Kim is grateful for a Seoul Science Fellowship provided by the Seoul Metropolitan Government.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Beom Seok Kim
    • 1
  • Gang Mo Yang
    • 1
  • Sangwoo Shin
    • 1
  • Geehong Choi
    • 1
  • Hyung Hee Cho
    • 1
  1. 1.Department of Mechanical EngineeringYonsei UniversitySeoulKorea

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