The pressure effects of expanding the cross section of microchannels along the direction of flow are investigated across four rates of channel expansion in the flow boiling of R-134a. Prior investigation by the authors detailed the fabrication of four copper microchannel arrays and the pumped-loop apparatus developed to facilitate interchange of the microchannel specimens, allowing consistency across experiments. Significant beneficial pressure effects are observed to result from the expansion, including reduction by half of the pumping cost per flow rate at critical heat flux. The improvements are seen with small expansions, and greater expansion yields diminishing returns. The high pressure drops associated with microchannel evaporators are effectively reduced by expanding channel geometry, and the low-frequency system spectral response indicates that expanding channel arrays typically carry less energy in oscillations up to 2.5 Hz, suggesting amelioration of oscillatory instabilities. Results are discussed in light of a comparative force analysis, with the balance of these forces linked to the observed behavior of the pressure drop and heat flux relationship.
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An Experimental Investigation of Pressure Drop in Expanding Microchannel Arrays
Mark J. Miner,
Mark J. Miner
1
e-mail: mark.miner@asu.edu
1Corresponding author.
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Patrick E. Phelan,
Carlos A. Ortiz
Arizona State University,
Carlos A. Ortiz
Mechanical Engineering
,Arizona State University,
Tempe, AZ 85281
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Mark J. Miner
e-mail: mark.miner@asu.edu
Patrick E. Phelan
e-mail: phelan@asu.edu
Carlos A. Ortiz
Mechanical Engineering
,Arizona State University,
Tempe, AZ 85281
1Corresponding author.
Contributed by the Heat Transfer Division of ASME for publication in the JOURNAL OF HEAT TRANSFER. Manuscript received January 26, 2013; final manuscript received August 21, 2013; published online November 21, 2013. Assoc. Editor: W. Q. Tao.
J. Heat Transfer. Mar 2014, 136(3): 031502 (9 pages)
Published Online: November 21, 2013
Article history
Received:
January 26, 2013
Revision Received:
August 21, 2013
Citation
Miner, M. J., Phelan, P. E., Odom, B. A., and Ortiz, C. A. (November 21, 2013). "An Experimental Investigation of Pressure Drop in Expanding Microchannel Arrays." ASME. J. Heat Transfer. March 2014; 136(3): 031502. https://doi.org/10.1115/1.4025557
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