Film boiling heat transfer from a wire to upward flow of liquid hydrogen and liquid nitrogen

Cryogenic Engineering Conference 2015

材料科学;物理学

Shiotsu, M.^1 ; Shirai, Y.^1 ; Horie, Y.^1 ; Shigeta, H.^1 ; Higa, D.^1 ; Tatsumoto, H.^2 ; Hata, K.^3 ; Kobayashi, H.^4 ; Nonaka, S.^4 ; Naruo, Y.^4 ; Inatani, Y.^4

Dept. of Energy Sci. and Tech., Kyoto Univ., Sakyo-ku, Kyoto

606-8501, Japan^1

J-PARC Center, Japan Atomic Energy Agency, Tokai-Ibaraki

319-1195, Japan^2

Inst. of Advanced Energy, Kyoto Univ., Uji, Kyoto

611-0011, Japan^3

Inst. of Space and Astronautical Science, JAXA, Kanagawa

229-8510, Japan^4

关键词: Equation based;    Film boiling;    Forced flows;    FRP(fiber reinforced plastics);    Heater surface;    Liquid hydrogens;    Pt-Co alloys;    Upward flow;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/101/1/012175/pdf
DOI  :  10.1088/1757-899X/101/1/012175

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Film boiling heat transfer coefficients in liquid hydrogen were measured for the heater surface superheats to 300 K under pressures from 0.4 to 1.1 MPa, liquid subcoolings to 11 K and flow velocities to 8 m/s. Two test wires were both 1.2 mm in diameter, 120 mm and 200 mm in lengths and were made of PtCo alloy. The test wires were located on the center of 8 mm and 5 mm diameter conduits of FRP (Fiber Reinforced Plastics). Furthermore film boiling heat transfer coefficients in liquid nitrogen were measured only for the 200 mm long wire. The film boiling heat transfer coefficients are higher for higher pressure, higher subcooling, and higher flow velocity. The experimental data were compared with a conventional equation for forced flow film boiling in a wide channel. The data for the 8 mm diameter conduit were about 1.7 times and those for the 5 mm conduit were about 1.9 times higher than the predicted values by the equation. A new equation was presented modifying the conventional equation based on the liquid hydrogen and liquid nitrogen data. The experimental data were expressed well by the equation.