每年出版 8 期
ISSN 打印: 1065-5131
ISSN 在线: 1563-5074
Indexed in
Flow Instability and Augmented Heat Transfer of Fin Arrays
摘要
A two-dimensional numerical computation was carried out for an in-line type of fln array for a periodically changing unsteady flow regime, or for the second laminar flow regime characterized by the self-sustained flow oscillation. Mechanisms of heat transfer augmentation due to the flow instability are discussed based on the obtained flow and thermal fields. First, it is observed that the flow instability occurring in the wake of a fin leads to the accelerated recovery of the wake and results in the mitigation of the wake effect and that it is effective to enhance the heat transfer of the downstream fin. Secondly, positive values of νθ are also produced near the fin surface. This is another mechanism to produce the fin surface heat transfer enhancement. It is also found that the dissimilarity between the momentum transfer and heat transfer is produced near the fin surface. Non-zero values of −uν take a sign to suppress the momentum transfer in spite of the favorable sign of νθ for heat transfer enhancement. It is also pointed out that flow is destabilized in the wake but is stabilized in the fin boundary layer.
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