Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7915624 | Cryogenics | 2018 | 30 Pages |
Abstract
Heat transfer from inner side of a heated vertical pipe to liquid hydrogen flowing upward was measured at the pressures of 0.4, 0.7 and 1.1â¯MPa for wide ranges of flow rate and liquid temperature. Nine test heaters with different inner diameters of 3, 4, 6 and 9â¯mm and the lengths of 50, 100, 150, 200, 250 and 300â¯mm were used. The DNB (departure from nucleate boiling) heat fluxes in forced flow of liquid hydrogen were measured for various subcoolings and flow velocities at pressures of 0.4, 0.7 and 1.1â¯MPa. Effect of L/d (ratio of heater length to diameter) was clarified for the range of L/d⩽50. A new correlation of DNB heat flux was presented based on a simple model and the experimental data. Similar experiments were performed for liquid nitrogen at pressures of 0.5â¯MPa and 1.0â¯MPa by using the same experimental system and some of the test heaters. It was confirmed that the new correlation can describe not only the hydrogen data, but also the data of liquid nitrogen.
Related Topics
Physical Sciences and Engineering
Materials Science
Electronic, Optical and Magnetic Materials
Authors
Yasuyuki Shirai, Hideki Tatsumoto, Masahiro Shiotsu, Koichi Hata, Hiroaki Kobayashi, Yoshihiro Naruo, Yoshifumi Inatani,