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- W4384785890 abstract "For flow boiling in microchannel, the flow passage may be clogged by bubbles generated in the channels and caused flow reversal and partial dryout in the channels if the channel size is smaller than or similar to the bubble departure size. This study developed a 2-pass diverging microchannels heat exchanger to avoid flow reversal and partial dryout of HFC-245fa flow boiling in the evaporation cooling systems. It is aimed to improve the diverging microchannel heat exchangers designed by previous studies and to effectively accommodate diverging channels on a limited heating base surface. The test results showed that the maximum heat transfer coefficients in diverging channel heat exchanger were as much as 20% higher than those in straight channel heat exchanger, while the maximum partial dryout heat flux is 42% higher in diverging channel heat exchanger. There is no significant difference for the pressure drops in two heat exchangers at low heat fluxes before it reached the partial dryout condition. For higher flux, the pressure drops in straight channels were higher than those in divergent channels while partial dryout. It is concluded that the 2-pass diverging channel design provided higher maximum heat transfer coefficients and higher maximum heat fluxes with lower penalties of pressure drops. It could be a good design to replace the conventional straight channel heat exchanger for evaporation cooling systems." @default.
- W4384785890 created "2023-07-20" @default.
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- W4384785890 date "2023-01-01" @default.
- W4384785890 modified "2023-09-26" @default.
- W4384785890 title "Development of Heat Exchangers with 2-pass Diverging Microchannels for Evaporation Cooling Systems" @default.
- W4384785890 doi "https://doi.org/10.1615/jenhheattransf.2023048705" @default.
- W4384785890 hasPublicationYear "2023" @default.
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