Journal of Flow Visualization and Image Processing

ISSN for PRINT: 1065-3090

For Online Access

Best Paper Award Selection - Editorial Board Site

2005, Volume12

Issue 3

138 pages

DOI: 10.1615/JFlowVisImageProc.v12.i3

Issue price - $154.00

Sheng-An Yang
Department of Mold and Die Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, TAIWAN (R. O. C.)

Jung-Yu Lee
Department of Mold and Die Engineering, National Kaohsiung University of Applied Sciences, Kaohsiung 807, TAIWAN (R. O. C.)

Wen-Jei Yang
Department of Mechanical Engineering and Applied Mechanics, University of Michigan, Ann Arbor, Michigan 48109, U.S.A.

Numerical visualization is conducted to investigate turbulent film boiling heat transfer and vapor film growth on horizontal isothermal elliptical tubes. The effects of both eddy diffusivity and thermal radiation are taken into account. Theellipticity, heat capacity parameter, radiation parameter, and wal-to-saturated-vapor temperature ratio are varied to determine their effects on turbulent film boiling heat transfer performance and vapor film growth. It is concluded that the vapor film grows monotonically around the periphery of the elliptic tube from the lower to upper stagnation point. In contrast, the local Nusselt number is enhanced, reaching a maximum value and then diminishing rapidly along the lower to upper stagnation point. The average Nusselt number is augmented with an increase in both the ellipticity and temperature ratio. Results compared satisfactorily well with the existing experimental data obtained using Freon 12 and liquid nitrogen as the boiling media.

DOI: 10.1615/JFlowVisImageProc.v12.i3.40 Download article, 271-284 pages

Article price - $35.00

<< Previous article   Next article >>