Ultra High Critical Heat Flux During Forced Flow Boiling Heat Transfer With an Impinging Jet

[+] Author and Article Information
Yuichi Mitsutake, Masanori Monde

Department of Mechanical Engineering, Saga University, 1 Honjo-machi, Saga city, 840-8502, Japan

J. Heat Transfer 125(6), 1038-1045 (Nov 19, 2003) (8 pages) doi:10.1115/1.1621899 History: Received July 03, 2002; Revised July 22, 2003; Online November 19, 2003
Copyright © 2003 by ASME
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Relationship between heat flux and current for various materials and sizes of direct heated rectangular surface
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Schematic of experimental apparatus (1. Pressure vessel, 2. Heated surface, 3. Circular nozzle, 4. Cooler, 5. Filter, 6. Low-pressure pump, 7. High-pressure pump, 8. Pressure transducer, 9. Strain meter, 10. Multiplexer, 11. Ice box, 12. Digital multimeter, 13. GPIB interface, 14. Personal computer, 15. DC power supply, 16. Flow control valve, 17. Bypass valve, 18. Nitrogen gas cylinder)
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Experimental setup of heated surface and nozzle
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Photograph of top view of a burnt-out surface
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Simplified two-dimensional heater assembly section model and prescribed boundary conditions to assess heat losses to the electrodes and bakelite block
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Steady-state temperature field in the nickel foil and the bakelite block for q=200 MW/m2,L=10 mmh=0.1 mm,P=0.8 MPa(Tsat=170.4°C),ΔTsat=50 K
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Estimated heat losses to the electrodes and the bakelite, and total heat loss with two-dimensional heat conduction analysis
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Effect of heater thickness on CHF
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Relationship between CHF and velocity
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Relationship between CHF and subcooling of jet
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Relative accuracy of the correlation Eq. (2)
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Flow model in deriving the general correlation of CHF (Eq. (2)) (A: Saturated boiling region, B: subcooled boiling region, C: Single-phase flow region)
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Relationship between dimensionless CHF and system pressure




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