TY - JOUR
T1 - Investigation of boiling hydrogen flow characteristics under low-pressure conditions - Flow regime transition characteristics
AU - Sakamoto, Yuki
AU - Kobayashi, Hiroaki
AU - Naruo, Yoshihiro
AU - Takesaki, Yuichiro
AU - Nakajima, Yo
AU - Kabayama, Koki
AU - Sato, Tetsuya
N1 - Funding Information:
This work was supported by the JSPS Grant-in-Aid for JSPS Research Fellow Number 17J01920, JSPS KAKENHI Grant Number 17H03479, and Waseda University Early Bird program. The authors would like to thank Dr. K. Ohira, Mr. K. Takahashi, Mr. S. Tane, Mr. K. Minote, Mr. H. Tsujimura, and Mr. Furuichi for advising conducting the experiment. Also, technical assistance was received from JECC TORISHA Co. Ltd. to construct the experimental apparatus.
Funding Information:
This work was supported by the JSPS Grant-in-Aid for JSPS Research Fellow Number 17J01920 , JSPS KAKENHI Grant Number 17H03479 , and Waseda University Early Bird program. The authors would like to thank Dr. K. Ohira, Mr. K. Takahashi, Mr. S. Tane, Mr. K. Minote, Mr. H. Tsujimura, and Mr. Furuichi for advising conducting the experiment. Also, technical assistance was received from JECC TORISHA Co., Ltd. to construct the experimental apparatus.
Publisher Copyright:
© 2020 Hydrogen Energy Publications LLC
PY - 2021/2/11
Y1 - 2021/2/11
N2 - Understanding the thermal-fluid characteristics of boiling hydrogen is of great significance for applications of liquid hydrogen, such as alternative clean energy and space vehicles. The boiling temperature of liquid hydrogen under atmospheric pressure is 20.3 K; thus, it is easy to boil to form a gas–liquid two-phase flow. Fuel transfer under the boiling state has been avoided in the space industry because of its unstable flow characteristics; precise control of the fuel, including the boiling flow, is necessary to improve the space-vehicle performance. This study aims to understand the flow-regime transition characteristics of boiling hydrogen through experimental investigation. The experimental conditions were as follows: the flow direction was horizontal, the inner diameter of the heating pipe was 15 mm, the mass flux ranged from 50 to 110 kg/m2s, and the pressure ranged from 250 to 300 kPa A. The flow-regime transition characteristics were obtained by a high-speed camera. Fully liquid phase (LP), dispersed bubbly flow (DB), intermittent flow (IN), and annular flow (AN) were observed during the experiment. Each flow-regime boundary model is constructed using two dominant forces from the experimental result based on a Taitel–Dukler model. For the DB/IN boundary, a large-bubble sustainable condition is derived by the balance between the shear and buoyancy forces acting upon the bubble; for the IN/AN boundary, a droplet-sustainable condition is derived in terms of the force balance between the drag and gravity acting on the droplet. The semi-theoretical model predicts the experimental data with 96.7% accuracy.
AB - Understanding the thermal-fluid characteristics of boiling hydrogen is of great significance for applications of liquid hydrogen, such as alternative clean energy and space vehicles. The boiling temperature of liquid hydrogen under atmospheric pressure is 20.3 K; thus, it is easy to boil to form a gas–liquid two-phase flow. Fuel transfer under the boiling state has been avoided in the space industry because of its unstable flow characteristics; precise control of the fuel, including the boiling flow, is necessary to improve the space-vehicle performance. This study aims to understand the flow-regime transition characteristics of boiling hydrogen through experimental investigation. The experimental conditions were as follows: the flow direction was horizontal, the inner diameter of the heating pipe was 15 mm, the mass flux ranged from 50 to 110 kg/m2s, and the pressure ranged from 250 to 300 kPa A. The flow-regime transition characteristics were obtained by a high-speed camera. Fully liquid phase (LP), dispersed bubbly flow (DB), intermittent flow (IN), and annular flow (AN) were observed during the experiment. Each flow-regime boundary model is constructed using two dominant forces from the experimental result based on a Taitel–Dukler model. For the DB/IN boundary, a large-bubble sustainable condition is derived by the balance between the shear and buoyancy forces acting upon the bubble; for the IN/AN boundary, a droplet-sustainable condition is derived in terms of the force balance between the drag and gravity acting on the droplet. The semi-theoretical model predicts the experimental data with 96.7% accuracy.
KW - Boiling
KW - Flow regime
KW - Liquid hydrogen
KW - Void fraction
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U2 - 10.1016/j.ijhydene.2020.12.038
DO - 10.1016/j.ijhydene.2020.12.038
M3 - Article
AN - SCOPUS:85099153372
SN - 0360-3199
VL - 46
SP - 8239
EP - 8252
JO - International Journal of Hydrogen Energy
JF - International Journal of Hydrogen Energy
IS - 11
ER -