Microjet array impingement heat transfer crossflow effects in single-phase and flow boiling

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Authors
Werneke, Brian M.
Issue Date
2015-12
Type
Electronic thesis
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Language
ENG
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Mechanical engineering
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Abstract
Microjet array performance steadily decreased with increasing crossflow. Baseline heat transfer coefficients were reduced by 20-40% at a critical jet-to-channel mass flux ratio of 1. For greater ratios, the single-phase and flow boiling array impingement heat transfer asymptotically approached performance characteristics associated with microchannel flow. Microchannel mass flow ranged 380<G_ch<10500 kg/m2-s and corresponded to simultaneously developing flow conditions. Single-phase microchannel heat transfer ranged 15<Nu_ch<115 for 450<Re_ch<8340. Microchannel flow boiling enhanced the single-phase heat transfer rates by 22% and increased CHF as much as 88% depending on the flow conditions. Increased mass flow and subcooling improved ONB by lowering superheat and increasing the heat flux. The peak microchannel flow performance dissipated 160W/cm2 at ΔT_sat=30ºC with a heat transfer coefficient of 22750W/m2-K.
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December 2015
School of Engineering
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Rensselaer Polytechnic Institute, Troy, NY
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