HEAT TRANSFER ENHANCEMENT IN A SLOT CHANNEL VIA A TRANSVERSELY OSCILLATING ADIABATIC CIRCULAR CYLINDER
HEAT TRANSFER ENHANCEMENT IN A SLOT CHANNEL VIA A TRANSVERSELY OSCILLATING ADIABATIC CIRCULAR CYLINDER
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DOI：
10.1016/j.ijheatmasstransfer.2009.10.034
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发表时间：
2010-01
影响因子：
5.2
通讯作者：
B. Celik;M. Raisee;A. Beskok
中科院分区：
文献类型：
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作者：
B. Celik;M. Raisee;A. Beskok
研究了均匀加热槽道中横向振动绝热圆柱体脱落的旋涡对传热的强化作用。缸运动和涡脱落对传热的影响进行了系统的评估，通过改变缸的振荡频率从75%到125%的自然涡脱落频率的一个固定的缸内相同的域。在Re=100和0.1 <$Pr <$10的数值模拟进行了使用谱元离散的Navier-Stokes方程和能量方程在移动域的基础上的任意拉格朗日-欧拉公式。在热发展的流动区域内的结果表明，由于放置一个固定的圆柱体相比，直通道的情况下，传热增强。圆柱体的横向振荡进一步增加了壁面传热系数。还提供了通道中的泵送功率和振荡缸所需的功率以用于比较。与75%的自然旋涡脱落频率的气缸振荡示出产生最好的结果，只有10%以上的功率泵送流体，与固定的气缸的情况相比。
Heat transfer enhancement in a uniformly heated slot channel due to vortices shed from a transversely oscillating adiabatic circular cylinder is investigated. Effects of the cylinder motion and vortex shedding on heat transfer are systematically assessed by varying the cylinder oscillation frequency from 75% to 125% of the natural vortex shedding frequency of a fixed cylinder within the same domain. Numerical simulations at Re=100 and 0.1⩽Pr⩽10 are performed using spectral element discretization of Navier–Stokes and energy equations in a moving domain based on an arbitrary Lagrangian–Eulerian formulation. Results within the thermally developing flow region show heat transfer enhancement due to the placement of a stationary cylinder compared to the straight channel case. Transverse oscillations of the cylinder further increase the wall heat transfer coefficient. Pumping power in the channel and the power necessary to oscillate the cylinder is also provided for comparisons. Cylinder oscillations with 75% of the natural vortex shedding frequency is shown to yield the best results with only 10% more power to pump the fluid, compared with the fixed cylinder case.