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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat transfer in a high Hartmann number MHD duct flow with a circular cylinder placed near the heated side-wall
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Heat transfer in a high Hartmann number MHD duct flow with a circular cylinder placed near the heated side-wall

机译：在具有哈特曼数MHD的高风道流中进行热传递，并在靠近加热侧壁的位置放置一个圆柱

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摘要

The heat transfer from the side-wall of a duct through which an electrically conducting fluid flows within a strong transverse magnetic field is investigated. A circular cylinder aligned with the magnetic field is offset from the duct centerline. In this configuration the flow is well described by a quasi-two-dimensional model and is therefore solved on a two-dimensional domain. The effects of blockage ratio, gap ratio and Reynolds number on the flow and heat transfer are considered. An optimal cylinder position is determined using an efficiency index defined as the ratio of heat transfer enhancement to pressure drop penalty resulting from insertion of the cylinder in the channel. Cylinder placement with gaps to the heated wall of between 0.83 and 1.4 diameters performed best, achieving at least 95% of the peak efficiency indices for each blockage ratio. These gap ratios corresponded to the periodic shedding of alternating-sign vortices into the wake which interacted with the heated side-wall boundary layer to form counter-rotating vortex pairs carrying hot fluid into the duct interior. By offsetting the cylinder from the wake centreline, heat transfer enhancement of up to 48% compared to the centreline placement is achieved with only a modest increase in the pressure head losses from cylinder drag.
机译：研究了从管道的侧壁传出的热量，导电流体在强横向磁场中流过该管道。与磁场对齐的圆柱体偏离管道中心线。在这种配置中，流量由准二维模型很好地描述，因此可以在二维域中求解。考虑了堵塞比，间隙比和雷诺数对流动和传热的影响。使用效率指数确定最佳气缸位置，该效率指数定义为传热增强与气缸插入通道所产生的压降损失之比。与加热壁之间的间隙介于0.83和1.4直径之间的气缸放置效果最好，对于每个堵塞率，至少达到峰值效率指标的95％。这些间隙比对应于交替的涡流周期性地脱落到尾流中，该尾流与加热的侧壁边界层相互作用形成反向旋转的涡流对，从而将热流体输送到管道内部。通过使气缸偏离尾流中心线，与中心线位置相比，传热提高了48％，而气缸阻力造成的压头损失仅适度增加。

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