Effect of horizontal bottom surface on film boiling heat transfer from a vertical cylinder
Conference
·
OSTI ID:20030458
For the film boiling around a three-dimensional body with horizontal bottom surface such as a vertically placed cylinder, film boiling under the bottom surface may affect the heat transfer rate on the vertical lateral surface of the body. The vapor produced beneath the horizontal bottom surface flows upward from the edge of the horizontal bottom surface and results in thickening the vapor film that coats the vertical lateral surface of the body. The well-known Bromley's classical solution for a vertical surface cannot be applied to such a system. The laminar film boiling heat transfer from a vertical cylinder to saturated liquids was analyzed for the case with downward-facing horizontal bottom surface. For the heat transfer on the vertical lateral surface Bromley's solution was modified to accommodate the continuity of vapor mass flow rate around the lower corner of the vertical cylinder. Figure A-2 shows the average Nusselt numbers on the vertical lateral surface obtained for the four cases with different boundary conditions of velocity at the vapor-liquid interface. The classical Bromley's solutions for a vertical surface are obtained when the diameter of the bottom surface, D, approaches 0. The present study shows that the effect of the vapor mass flow generated under the downward-facing horizontal surface is to decrease the film boiling heat transfer rate that would have been produced by the vertical lateral surface in the absence of the downward-facing horizontal surface. The results obtained for a vertical slab are also shown in Figure A-2 to compare the result of the vertical cylinder with that of the vertical slab where L and H are, respectively, the width and the height of the vertical slab.
- Research Organization:
- Nagasaki Univ. (JP)
- OSTI ID:
- 20030458
- Country of Publication:
- United States
- Language:
- English
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