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采用数值模拟方法研究了同螺距下折流板搭接量对壳程流动传热的影响。结果表明,随搭接量增大,同流量下壳程换热系数和压降均降低;三角区漏流减轻局部阻力减小,同时边缘三角区漏流加强了壳体附近区域流体的轴向和旋转流动;中心换热管的换热量急剧下降,靠近壳体换热管的变化不大。场协同分析表明,三角区漏流促进换热而边缘三角区漏流削弱换热;随搭接量的增大壳程速度场与热流场的整体协同性得到改善。
The numerical simulation is used to study the influence of baffle overlap on the flow and heat transfer in the shell side at the same pitch. The results show that the shell side heat transfer coefficient and pressure drop decrease with the increase of lap amount; the local resistance of the triangular zone to reduce the leakage decreases, while the leakage in the triangular zone of the periphery strengthens the axial direction of the fluid in the vicinity of the shell And rotating flow; central heat exchanger tube heat loss dropped sharply, close to the shell heat exchanger tube little change. The field synergy analysis shows that the leakage in the triangular zone enhances the heat transfer while the leakage in the edge triangular zone weakens the heat transfer. The overall synergy between the shell-side velocity field and the heat flow field is improved with the increase of the overlap.