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针对矩形通道内的层流对流换热问题,通过数值求解速度场协同方程,得到了给定黏性耗散条件下通道内的最优速度场为多纵向涡的流动结构,表明多纵向涡流型可在流阻增加不多的情况下使换热显著强化。通过在通道壁面布置不连续双斜肋,在通道内产生了接近于最优速度场的多纵向涡流动,数值计算结果表明,在Re=1000时,与光滑通道相比,不连续双斜肋通道的平均努谢尔数增加61.3%,阻力系数增加79.2%。
Aiming at the problem of laminar convection in a rectangular channel, the optimal velocity field in a channel with given viscous dissipation is obtained as a multi-longitudinal vortex flow structure by numerical solution of the velocity field synergistic equation. It shows that the multi-longitudinal eddy current Heat transfer can be significantly enhanced with little increase in flow resistance. By arranging the discontinuous double slant ribs on the wall of the channel, a multi-longitudinal eddy current is generated in the channel close to the optimal velocity field. The numerical results show that at Re = 1000, compared with the smooth channel, the discontinuous double slant ribs The average Nusselt number increased by 61.3% and drag coefficient increased by 79.2%.