title   
  

High mass flux flow boiling and critical heat flux in microscale

Kaya, Alihan and Özdemir, Mehmed Rafet and Koşar, Ali (2013) High mass flux flow boiling and critical heat flux in microscale. International Journal of Thermal Sciences, 65 . pp. 70-78. ISSN 1290-0729

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Official URL: http://dx.doi.org/10.1016/j.ijthermalsci.2012.10.021

Abstract

This study explores critical heat flux in flow boiling of de-ionized water at high mass fluxes in ~249 µm and ~494 µm inner diameter tubes, which are heated along short heated lengths (2-10 mm). Ultra high heat flux cooling (>10000 W/cm2) is achieved in micro scale at high mass fluxes (>10000 kg/m2s). Input heating powers were measured and processed to obtain critical heat fluxes (CHF). It was shown that high heat removal rates more than 30000 W/cm2 were attained with a reasonable combination of working conditions (short heated length-high mass flux-small hydraulic diameter), which can be proposed as a promising solution method for possible new emerging applications such as nano-scale plasmonic applications, near field radiative energy exchange between objects, and nano thermophotovoltaics. Experimental results were compared with the existing CHF prediction methods recommended for low quality flow boiling, and a new correlation for predicting CHF was proposed.

Item Type:Article
Uncontrolled Keywords:High heat flux cooling; Flow boiling; Microchannels; Critical heat flux
Subjects:T Technology > T Technology (General)
T Technology > TJ Mechanical engineering and machinery
Q Science > QC Physics > QC310.15 Thermodynamics
ID Code:21383
Deposited By:Ali Koşar
Deposited On:12 Feb 2013 11:01
Last Modified:19 Nov 2014 15:46

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