Estimation of Heat Flux Through Free Liquid Hydrogen Surface in Cryogenic Tanks with Supercharged Vapor Space

2017 ◽  
Vol 53 (1-2) ◽  
pp. 101-105
Author(s):  
V. I. Ryazhskikh ◽  
A. A. Khvostov ◽  
A. V. Ryazhskikh ◽  
A. V. Ivanov ◽  
A. V. Kozlov
Keyword(s):  
Heat Flux ◽  
Liquid Hydrogen ◽  
Cryogenic Tanks ◽  
Vapor Space

Prediction of liquid hydrogen flow boiling critical heat flux condition under microgravity based on the wall heat flux partition model

2020 ◽  
Vol 45 (11) ◽  
pp. 7141-7150 ◽  
Author(s):  
Yao Zheng ◽  
Huawei Chang ◽  
Yinan Qiu ◽  
Chen Duan ◽  
Jianye Chen ◽  
...  
Keyword(s):  
Heat Flux ◽  
Critical Heat Flux ◽  
Flow Boiling ◽  
Liquid Hydrogen ◽  
Wall Heat Flux ◽  
Partition Model ◽  
Hydrogen Flow ◽  
Flux Condition

Two-Phase Pipe Quenching Correlations for Liquid Nitrogen and Liquid Hydrogen

2019 ◽  
Vol 141 (4) ◽  
Author(s):  
S. R. Darr ◽  
J. W. Hartwig ◽  
J. Dong ◽  
H. Wang ◽  
A. K. Majumdar ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Liquid Nitrogen ◽  
Critical Heat Flux ◽  
Flow Boiling ◽  
Nucleate Boiling ◽  
Liquid Hydrogen ◽  
Two Phase ◽  
Cryogenic Flow ◽  
Two Phase Heat Transfer

Recently, two-phase cryogenic flow boiling data in liquid nitrogen (LN2) and liquid hydrogen (LH2) were compared to the most popular two-phase correlations, as well as correlations used in two of the most widely used commercially available thermal/fluid design codes in Hartwig et al. (2016, “Assessment of Existing Two Phase Heat Transfer Coefficient and Critical Heat Flux on Cryogenic Flow Boiling Quenching Experiments,” Int. J. Heat Mass Transfer, 93, pp. 441–463). Results uncovered that the correlations performed poorly, with predictions significantly higher than the data. Disparity is primarily due to the fact that most two-phase correlations are based on room temperature fluids, and for the heating configuration, not the quenching configuration. The penalty for such poor predictive tools is higher margin, safety factor, and cost. Before control algorithms for cryogenic transfer systems can be implemented, it is first required to develop a set of low-error, fundamental two-phase heat transfer correlations that match available cryogenic data. This paper presents the background for developing a new set of quenching/chilldown correlations for cryogenic pipe flow on thin, shorter lines, including the results of an exhaustive literature review of 61 sources. New correlations are presented which are based on the consolidated database of 79,915 quenching points for a 1.27 cm diameter line, covering a wide range of inlet subcooling, mass flux, pressure, equilibrium quality, flow direction, and even gravity level. Functional forms are presented for LN2 and LH2 chilldown correlations, including film, transition, and nucleate boiling, critical heat flux, and the Leidenfrost point.

Thermal and hydrodynamical study of a whirling layer of liquid hydrogen under high heat flux

Cryogenics ◽  
1968 ◽  
Vol 8 (6) ◽  
pp. 378-380
Author(s):  
R Ewald ◽  
A Lacaze ◽  
P Perroud ◽  
L Weil
Keyword(s):  
Heat Flux ◽  
High Heat ◽  
Liquid Hydrogen ◽  
High Heat Flux

Ceramic Miniature Heat Pipes and Liquid Charging Methods

2000 ◽  
Author(s):  
Mingcong Gao ◽  
Yiding Cao ◽  
W. Kinzy Jones ◽  
Marc A. Zampino
Keyword(s):  
Heat Flux ◽  
Heat Input ◽  
Heating Surface ◽  
Heat Pipes ◽  
Advantages And Disadvantages ◽  
Vapor Space ◽  
Working Liquid

Abstract Three working-liquid charging methods for miniature heat pipes are introduced, and their advantages and disadvantages are described. Using these methods, two types of ceramic heat pipes were charged and tested. The ceramic heat pipes were made of alumina and have overall dimensions of 89 mm × 12 mm × 2.9 mm and a designed vapor space of 82.5 mm × 4.1 mm × 1.27 mm. Axial micro capillary grooves were provided on the top and bottom or sidewalk inside the heat pipes as wick structures. Water was used as working liquid. More than 20 Watts of heat input was achieved on a 5 mm × 5 mm heating surface. The corresponding heat flux was 80 W/cm2.

scholarly journals DNB heat flux in forced flow of subcooled liquid hydrogen under pressures

2012 ◽  
Author(s):  
Yasuyuki Shirai ◽  
Masahiro Shiotsu ◽  
Hiroto Kobayashi ◽  
Taiki Takegami ◽  
Hideki Tatsumoto ◽  
...  
Keyword(s):  
Heat Flux ◽  
Liquid Hydrogen ◽  
Forced Flow ◽  
Subcooled Liquid

scholarly journals DNB heat flux in forced convection of liquid hydrogen for a wire set in central axis of vertically mounted flow channel

2017 ◽  
Vol 278 ◽  
pp. 012034 ◽  
Author(s):  
T Matsumoto ◽  
Y Shirai ◽  
M Shiotsu ◽  
K Fujita ◽  
T Kainuma ◽  
...  
Keyword(s):  
Heat Flux ◽  
Forced Convection ◽  
Liquid Hydrogen ◽  
Flow Channel ◽  
Central Axis

DNB heat flux on inner side of a vertical pipe in forced flow of liquid hydrogen and liquid nitrogen

Cryogenics ◽  
2018 ◽  
Vol 92 ◽  
pp. 105-117 ◽  
Author(s):  
Yasuyuki Shirai ◽  
Hideki Tatsumoto ◽  
Masahiro Shiotsu ◽  
Koichi Hata ◽  
Hiroaki Kobayashi ◽  
...  
Keyword(s):  
Heat Flux ◽  
Liquid Nitrogen ◽  
Liquid Hydrogen ◽  
Forced Flow ◽  
Vertical Pipe
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