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Numerical analysis of heat transfer between multiple jets and flat moving surface
International Journal of Heat and Mass Transfer ( IF 5.2 ) Pub Date : 2021-02-23 , DOI: 10.1016/j.ijheatmasstransfer.2021.121088
Sanil Shah

The current work represents the numerical analysis of heat transfer between single and three inline circular jets impinging on an orthogonally flat moving surface. The analysis is carried out at different surface-to-jet velocity ratios (r) = 0.25,0.50,0.75, 1.0 and 2.0 and three jet-to-jet spacing (s) = 2D,4D and 6D for multiple jets. All cases have been performed at the jet-to-surface distance (H) = 6D and Reynolds number = 26000 where D is a jet diameter. The SST-k-ε turbulence model is used for solving turbulent flow problem. The influence of surface velocity on heat transfer as well as flow field over the surface has been analyzed. The results show that localized Nusselt number varies with velocity ratio and stagnation values of Nusselt number lower with velocity ratios. For single jet, spanwise heat transfer of surface dominated by the surface motion for r > 0.75, and the associated flow field also modify with surface motion. For multiple jets, jet-to-jet spacing has an influence in secondary peak in Nusselt number between neighboring jets at low values of velocity ratio. For a single jet, the average Nusselt number remains almost constant for 0 r 0.75 and then increases drastically after r > 0.75 but for multiple jets, it increases smoothly with r. Skin friction coefficient distribution at the symmetry line of the target surface is uniform on both sides of the stagnation point and it becomes more uneven with increasing velocity ratio (r).



中文翻译:

多喷头与平面运动面之间传热的数值分析

当前的工作代表了对正交平面运动表面上的单个和三个直列圆形射流之间传热的数值分析。该分析是在不同的表面喷射速度比(r)= 0.25、0.50、0.75、1.0和2.0的情况下进行的,并且对于多个喷射而言,三个喷射间隔(s)= 2D,4D和6D。所有情况均以射流到表面的距离(H)= 6D和雷诺数= 26000进行,其中D是射流直径。SST-k-ε湍流模型用于解决湍流问题。分析了表面速度对热传递以及表面流场的影响。结果表明,局部Nusselt数随速度比而变化,Nusselt停滞值随速度比而降低。对于单射流,当r> 0.75时,以表面运动为主的表面沿展向传热,并且相关的流场也随表面运动而变化。对于多喷头,喷头之间的间距会影响低速比值下相邻喷头之间的努塞尔数的次要峰。对于单架飞机,平均努塞尔数几乎保持恒定,为0 [R 0.75,然后在r之后急剧增加 >0.75,但对于多喷头,它随r平滑增加。目标表面的对称线处的皮肤摩擦系数分布在停滞点的两侧是均匀的,并且随着速度比(r)的增加而变得更加不均匀。

更新日期:2021-02-24
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