Heat Transfer Enhancement and Vortex Flow Structure Over a Heated Cylinder Oscillating in the Crossflow Direction
- 1 November 1999
- journal article
- Published by ASME International in Journal of Heat Transfer
- Vol. 121 (4), 789-795
- https://doi.org/10.1115/1.2826067
Abstract
Experiments are preformed to study the flow structure and heat transfer over a heated oscillating cylinder. Both flow visualization using a smoke wire and local heat transfer measurements around the cylinder were made. The excitation frequencies of the cylinder are selected at Fe/Fn = 0, 0.5, 1, 1.5, 2, 2.5, and 3. These include excitations at harmonic, subharmonic, superharmonic, and nonharmonic frequencies. Synchronization of vortex shedding with the cylinder excitation occurs not only at Fe/Fn = 1 but also at Fe/Fn = 3, which can greatly enhance the heat transfer. The simultaneous enhancement of heat transfer at the stagnation point, its downstream region, and the wake region of the flow suggests that different modes of instabilities occurring in the shear layer of the near wake are actually initiated and amplified far upstream in the stagnation point, which were suppressed in the accelerated flow region and re-amplified in the decelerated flow region. As long as the dominant mode of the instability is amplified by the excitation of cylinder, enhancement of heat transfer can be obtained. During the experiments, the Reynolds numbers vary from 1600 to 4800, the ratios of oscillation amplitude to diameter of the cylinder from 0.064 to 0.016.Keywords
This publication has 21 references indexed in Scilit:
- A finite difference calculation of forced convective heat transfer from an oscillating cylinderInternational Journal of Heat and Mass Transfer, 1994
- Patterns of vortex shedding from an oscillating circular cylinderAIAA Journal, 1992
- Surface Curvature Effect on Slot-Air-Jet Impingement Cooling Flow and Heat Transfer ProcessJournal of Heat Transfer, 1991
- Vortex Shedding from Oscillating Bluff BodiesAnnual Review of Fluid Mechanics, 1984
- Numerical Solution for Laminar Two Dimensional Flow About a Cylinder Oscillating in a Uniform StreamJournal of Fluids Engineering, 1982
- Vortex shedding from bluff bodies in oscillatory flow: A report on Euromech 119Journal of Fluid Mechanics, 1980
- The wakes of cylindrical bluff bodies at low Reynolds numberPhilosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1978
- The vortex-street wakes of vibrating cylindersJournal of Fluid Mechanics, 1974
- The vortex street in the wake of a vibrating cylinderJournal of Fluid Mechanics, 1972
- Periodic Flow PhenomenaAnnual Review of Fluid Mechanics, 1972