Liquid Nitrogen Flow Boiling Critical Heat Flux in Additively Manufactured Cooling Channels
نویسندگان
چکیده
This paper presents an experimental characterization of liquid nitrogen (LN2) flow boiling in additively manufactured minichannels. There is a pressing need concerted efforts from the space exploration and thermal transport communities to design high-performance rocket engine cooling channels. A close observation literature gaps warrants systematic cryogenic asymmetrically heated small (<3 mm) non-circular channels fabricated with advanced manufacturing technologies at mass flux > 3000 kg/m2s pressure 1 MPa. As such, this work LN2 results for three GR-Cop42 1.8 mm, 2.3 2.5 mm hydraulic diameters. Twenty different tests have been performed flux~3805–14,295 kg/m2s, pressures~1.38 1.59 MPa, subcooling~0 5 K. maximum departure nucleate (DNB)-type critical heat (CHF) 768 kW/m2 has achieved channel. The show that CHF increases increasing rate (337–459 25–57 cm3/s channel) decreasing channel size (307–768 2.5–1.8 channel). Finally, DNB correlation developed 10.68% mean absolute error.
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ژورنال
عنوان ژورنال: Aerospace
سال: 2023
ISSN: ['2226-4310']
DOI: https://doi.org/10.3390/aerospace10060499