Liquid flow friction factor and heat transfer coefficient in small channels: an experimental investigation
Résumé
This article presents friction factor and heat transfer coefficient experimental results obtained with a liquid flow of R134a in rectangular mini-channels. Two test sections made of aluminium multi-port extruded (MPE) tubes (channels dimensions 1.11 × 1.22 mm and 0.73 × 0.72 mm) were tested. Mass flux ranges from 65 to 2900 kg/m2 s and heat flux from 210 to 49 700 W/m2. The emphasis has been put on metrology problems and how they influence experimental results in mini-channels. Literature correlations for large tubes were found to predict our results reasonably well.
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