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

Author:

Mitsutake Yuichi1,Monde Masanori1

Affiliation:

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

Abstract

An ultra high critical heat flux (CHF) was attempted using a highly subcooled liquid jet impinging on a small rectangular heated surface of length 5∼10mm and width 4 mm. Experiments were carried out at jet velocities of 5∼60m/s, a jet temperature of 20°C and system pressures of 0.1∼1.3MPa. The degree of subcooling was varied from 80 to 170 K with increasing system pressure. The general correlation for CHF is shown to be applicable for such a small heated surface under a certain range of conditions. The maximum CHF achieved in these experiments was 211.9 MW/m2, recorded at system pressure of 0.7 MPa, jet velocity of 35 m/s and jet subcooling of 151 K, and corresponds to 48% of the theoretical maximum heat flux proposed by Gambill and Lienhard.

Publisher

ASME International

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

Reference14 articles.

1. Gambill, W. R., and Lienhard, J. H., 1989, “An Upper Bound for the Critical Boiling Heat Flux,” ASME J. Heat Transfer, 111(3), pp. 815–818.

2. Bird, R. B., Stewart, W. E., and Lightfoot, E. N., 2002, Transport Phenomena, John Wiley & Sons, Inc., New York, pp. 39.

3. Haramura, Y. , 1989, “Characteristics of pool boiling heat transfer in the vicinity of the critical heat flux (relations between bubble motion and heat flux fluctuations),” Heat Transfer-Jpn. Res., 18(3), pp. 18–31.

4. Haramura, Y., and Katto, Y., 1983, “A new hydrodynamic model of critical heat flux, applicable widely to both pool and forced convection boiling on submerged bodies in saturated liquids,” Int. J. Heat Mass Transfer, 26(3), pp. 389–399.

5. Nariai, H., Shimura, T., and Inasaka, F., 1987, “Critical heat flux of subcooled flow boiling in narrow tube,” ASME-JSME Thermal Engineering Joint Conference, 5, pp. 455–462.

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