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CHF determination for high-heat flux phase change cooling system incorporating both micro-channel flow and jet impingement.

Author(s) : SUNG M. K., MUDAWAR I.

Type of article: Article

Summary

This paper explores the subcooled nucleate boiling and critical heat flux (CHF) characteristics of a hybrid cooling module that combines the cooling attributes of micro-channel flow and jet impingement. A test module was constructed and tested using HFE-7100 as working fluid. Increasing the coolant's flow rate and/or subcooling shifted both the onset of boiling and CHF to higher heat fluxes and higher wall temperatures. The hybrid module yielded heat fluxes as high as 1127 W/cm2, which is the highest value ever achieved for a dielectric coolant at near atmospheric pressure. It is shown the hybrid cooling configuration involves complex interactions between circular jets and micro-channel flow, and unusual spatial variations of void fraction and liquid velocity. These variations are ascertained using the developing homogeneous layer model in which the micro-channel flow is described as consisting of a homogeneous two-phase layer along the heated wall and a bulk liquid layer. CHF is determined by a superpositioning technique that consists of dividing the heated wall into two portions, one dominated by jet impingement and the other micro-channel flow. This technique is shown to be highly effective at predicting the CHF data for the hybrid cooling configuration. [Reprinted with permission from Elsevier. Copyright, 2008].

Details

  • Original title: CHF determination for high-heat flux phase change cooling system incorporating both micro-channel flow and jet impingement.
  • Record ID : 2009-1048
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 52 - n. 3-4
  • Publication date: 2009/01

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