This paper investigates experimentally flow boiling characteristics in a cross-linked microchannel heat sink at low mass fluxes and high heat fluxes. The heat sink consists of 45 straight microchannels with a hydraulic diameter of 248 μm and heated length of 16 mm. Three cross-links, of width 500 μm, are introduced in the present microchannel heat sink to achieve better temperature uniformity and to avoid flow maldistribution. Flow visualization, flow instability, and two-phase pressure drop measurements are conducted using the dielectric coolant FC-72 for the range of heat flux from 20.1 to 104.2 kW/m2, mass flux from 109 to 290 kg/m2.s, and exit quality from 0.02 to 0.65. Flow visualization studies indicate that the observed flow regime is primarily slug. Instability results show that the periods and amplitudes of inlet pressure and outlet saturation temperature oscillations decrease with increasing mass flux. The two-phase pressure drop strongly increases with the exit quality and the two-phase frictional pressure drop increases by a factor of 1.6–2, at xe, o < 0.3, as compared with that in the straight microchannel heat sink.
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ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting
August 1–5, 2010
Montreal, Quebec, Canada
Conference Sponsors:
- Fluids Engineering Division
ISBN:
978-0-7918-5450-1
PROCEEDINGS PAPER
Experimental Investigation of Flow Patterns, Pressure Drop, and Flow Instability During Flow Boiling in a Cross-Linked Microchannel Heat Sink
Ayman Megahed
Ayman Megahed
Concordia University, Montreal, QC, Canada
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Ayman Megahed
Concordia University, Montreal, QC, Canada
Paper No:
FEDSM-ICNMM2010-30967, pp. 1703-1710; 8 pages
Published Online:
March 1, 2011
Citation
Megahed, A. "Experimental Investigation of Flow Patterns, Pressure Drop, and Flow Instability During Flow Boiling in a Cross-Linked Microchannel Heat Sink." Proceedings of the ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels collocated with 3rd Joint US-European Fluids Engineering Summer Meeting. ASME 2010 8th International Conference on Nanochannels, Microchannels, and Minichannels: Parts A and B. Montreal, Quebec, Canada. August 1–5, 2010. pp. 1703-1710. ASME. https://doi.org/10.1115/FEDSM-ICNMM2010-30967
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