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

By Rémi Revellin, John Richard Thome. 2008

157 citations recorded by the source corpus.

Abstract 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 ±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 ±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.

Subfields: Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/a793c494c53b14b8c5b0fb1e881bc310012665a1

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In Mechanical Engineering

Citations in the corpus

A review of small heat pipes for electronics (2016, background): “The boiling limitation also can be expressed by critical heat flux (CHF) or burnout, which is a limiting operating heat flux for the safe operation of heat dissipation applications that refers to the replacement of liquid in contact with the heated surface with a vapour blanket (Revellin and Thome [”
Review and Comparative Analysis of Studies on Saturated Flow Boiling in Small Channels (2008, background): “223 G = 291-1118 q" = 53-196 P = 227-520 Experiments on CHF in parallel microchannels: ♦ Dryout is the leading CHF mechanism ♦ CHF increases with G and decreases with x ♦ CHF increases to a certain pressure, and decreases ther after Revellin and Thome (2008) [99] 5 fluids circular and rectangular Dh”
History, Advances, and Challenges in Liquid Flow and Flow Boiling Heat Transfer in Microchannels: A Critical Review (2012, background): “In general, they were developed with a small data set, and provided useful insight into the CHF mechanism [169, 170].”