Past Sponsor: NASA Microgravity Fluid Physics Program
Graduate Students: Basar Ozar (M.S. in ME 2002), Saptarshi Basu (Ph.D. candidate), Gregory Quinn (PhD. Candidate)
Collaborator: Prof. Amir Faghri
An experimental and computational study of hydrodynamics and heat transfer in a thin liquid film flowing over a rotating disk surface have been undertaken for both constant wall temperature and constant wall heat flux boundary conditions. Experiments involved measurement of liquid film thickness distributions and Nusselt number profiles in a unique rotating disk heat transfer apparatus.
In parallel to the experiments, both numerical and boundary layer integral modeling of the problem were conducted to allow a more in-depth understanding of the flow and heat transfer phenomena in rotating thin liquid films as a means of improving the heat exchange effectiveness in space applications.
Schematics of the thin film over a rotating disk |
Variation of Nusselt number for different Reynolds numbers for a Rossby number of 5000. Locations of the hydraulic jump are delineated by vertical dashed lines. |
Comparison of Nusselt Number from the integral |
Constant wall temperature Nusselt number variation over the disk surface for different Reynolds numbers for (a)low rotation Ro=1000 and (b) high rotation Ro=0.5 cases |
Nusselt number variation for constant wall temperature case for different Rossby numbers at a Reynolds number of 5000. (a) Ro =0.1, 10 , 5 x 10^3, (b) Ro = 0.1, 10. Location of the hydraulic jump is delineated by a vertical dashed line. |
Publications
Ozar, B., Faghri A. and Cetegen, B. M., “Experiments on the flow of a thin liquid film over a horizontal stationary and rotating disk surface,” Experiments in Fluids, Vol. 34, pp. 556-565, 2003
Ozar, B., Cetegen, B. M. and Faghri, A., “Experiments on heat transfer in a thin liquid film flowing over a rotating disk,” ASME Journal of Heat Transfer, Vol. 126, pp. 184 – 192, 2004
Rice, J., Faghri, A., Cetegen, B. M., “Analysis of a free surface film from a controlled liquid impingement jet over a rotating disk including conjugate effects with and without evaporation,” International Journal of Heat and Mass Transfer, Vol. 48, pp. 5192-5204, 2005
Basu, S. and Cetegen, B. M. “Analysis of hydrodynamics and heat transfer in a thin liquid film flowing over a rotating disk by integral method,” ASME Journal of Heat Transfer, Vol. 128, pp 217-225, 2006
Basu, S. and Cetegen, B. M. “Effect of hydraulic jump on the hydrodynamics and heat transfer in a thin liquid film flowing over a rotating disk”, ASME Journal of Heat Transfer, to appear in May 2007