Journal
FLUIDS
Volume 6, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/fluids6040150
Keywords
microfluidic heat exchanger; two-phase flow heat exchangers; segmented flow; multiphase flow; heat transfer intensification; heat sink; electronic cooling
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Funding
- Russian Federation [CP-3109.2021.1]
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Experimental study demonstrated the effectiveness of intensifying convective heat transfer in microfluidic heat exchangers by creating a two-phase segmented flow, leading to increased Nusselt number and reduced thermal resistance. The enhancement was observed only within the range of gas volume fraction from 10% to 30%.
This work presents an experimental study of the possibility of intensifying in microfluidic heat exchangers (MFHE) by creating a two-phase segmented flow (gas-liquid). Measurements of convective heat transfer were carried out using an MFHE, consisting of six channels 1 x 1 mm. Experimental studies have shown that segmented flow makes it possible to increase the Nusselt number of a laminar flow in MFHE up to 1.67 and reduce thermal resistance up to 1.7 times compared to single-phase flow. At the same time, it was found that the intensification of heat exchange by a two-phase flow is observed only for the range of the volume fraction of gas from 10 to 30%. In addition, the calculation of the thermal performance criterion, including both thermal and hydraulic parameters (friction factor), also confirmed the promise of using the Taylor segmented flow as a method for single-phase heat transfer intensifying in microchannels.
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