Numerical Simulation of Flow and Heat Transfer Characteristics in the Channel with a Transversely Oscillating Heated Circular Cylinder
Date Issued
2008
Date
2008
Author(s)
Wang, Chung-Yi
Abstract
The study investigates the flow and heat transfer characteristics in the channel with a transversely oscillating heated circular cylinder. The variations of flow and thermal fields are classified into a class of moving boundary problems. In the numerical analysis, a spectral element formulation with arbitrary Langrangian-Eulerian method is adopted to solve the flow and thermal fields for moving boundary problem. The subsequent developments of the vortex shedding and heat transfer characteristics around the heat cylinders are presented in detail. The effect of Reynolds number, oscillating amplitude, oscillating frequency, blockage ratio on the flow structures and heat transfer characteristics of the heated cylinder are examined. The results show that the interaction between the oscillating cylinder and vortex shedding from the cylinder dominates the state of the wake. This phenomenon would disturb the flow and thermal fields in the channel flow and the heat transfer rate in the channel would be enhanced. Furthermore, as the flow and thermal fields may approach a periodic state in lock-in regime. The heat transfer of the cylinder in the lock-in regine is enhanced remarkably.
Subjects
Spectral element,
ALE method
Unstructured element
Oscillating cylinder
Channel flow
Blockage ratio
Type
thesis
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