Natural-convection heat transfer of supercritical helium in a channel
Natural-convection heat transfer of supercritical helium in laminar flow was measured on a vertical surface with and without a channel, which had dimensions of 10 mm width, 0.4 mm gap, and 130 mm lengths. The experimental pressures were from 0.25 to 0.8 mPa and fluid temperatures about 4.2 K. The results show that the channel effects on the heat-transfer coefficients are in the range of about [plus minus]20%. The conventional nondimensional equation for laminar flows with constant properties is successfully applied to correlate the results by using the film temperature in the case when it is below the pseudocritical temperature, and the pseudocritical temperature in the opposite case, as the reference temperature in evaluating the helium properties. Another heat source in the channel increased the heat transfer further when the temperature difference between the wall and fluid was less than 10 K, but not above it.
- OSTI ID:
- 6441519
- Journal Information:
- Heat Transfer - Japanese Research; (United States), Journal Name: Heat Transfer - Japanese Research; (United States) Vol. 21:5; ISSN 0096-0802; ISSN HTJPAU
- Country of Publication:
- United States
- Language:
- English
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