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A theoretical model for the prediction of the critical heat flux in heated microchannels.

Author(s) : REVELLIN R., THOME J. R.

Type of article: Article

Summary

A theoretical model for the prediction of the critical heat flux of refrigerants flowing in heated, round microchannels has been developed and presented here. The model is based on the two-phase conservation equations and includes the effect of the height of the interfacial waves of the annular film. Validation has been carried out by comparing the model, a numerical solution of a non-linear system of five differential equations, with a critical heat flux (CHF) database including three different refrigerants from two different laboratories. More than 96% of the data are predicted within a plus or minus 20% error band and a mean absolute error of 8%. Furthermore, it is also possible to predict CHF data from a third laboratory for water and R-113 flowing in rectangular (using the width of the channel as the characteristic dimension) and circular microchannel heat sinks with multiple channels. All together, 90% of the entire database, including four different fluids and different geometries, are predicted by the model within a plus or minus 20% error band and a mean absolute error of 9.3% for channels from 0.215 to 3.15 mm in size, mass fluxes from 29 to 1600 kg/m2.s, heated lengths from 10 to 126 mm and subcoolings from 2 to 77°C. [Reprinted with permission from Elsevier. Copyright, 2007].

Details

  • Original title: A theoretical model for the prediction of the critical heat flux in heated microchannels.
  • Record ID : 2008-1249
  • Languages: English
  • Source: International Journal of Heat and Mass Transfer - vol. 51 - n. 5-6
  • Publication date: 2008/03

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