油封低温冷却器折流板开孔的传热性能

Performance of low-temperature oil seal cooler with perforated baffle

针对油封低温冷却器压降较大的问题,利用计算流体动力学(CFD)软件Fluent分析油封低温冷却器折流板开孔对冷却器流场和传热性能的影响.首先探讨不同折流板数量、壳程流速等参数对折流板开孔引起的传热性能及压降变化规律,其次分析折流板开孔对冷却器综合性能的影响,最后探寻折流板开孔后冷却器传热性能和压降关系的内在联系.结果表明,折流板开孔引起油封冷却器压降和传热系数的显著变化,且压降比传热系数变化更明显,折流板开孔后压降减少40%50%,而传热系数也降低了15%20%.在等换热面积和等压降情况下,折流板开孔冷却器传热系数可以提高10%左右.

Aiming at the problem of higher pressure drop for low-temperature oil seal cooler, numerical simulation was performed for the perforated baffles based on computational fluid dynamics （CFD） techniques. The influence of the flow velocity in shell side on the variation of pressure drop and heat transfer caused by perforated baffles was studied, the effect of perforated baffles on the comprehensive properties of the cooler was analyzed and relationship between pressure drop and heat transfer coefficient owing to perforated baffles was further investigated. Results show that changes of pressure drop and heat transfer coefficient on shell side caused by perforated baffles are significant, and the change of pressure drop is more remarkable than that of the heat transfer coefficient, the pressure drop on shell side decreases by 40% - 50% , while the heat transfer coefficient decreases by 15% -20% for perforated baffles; comparing with the low-temperature oil seal cooler with original baffles, the heat transfer coefficient of low-temperature oil seal cooler with perforated baffles can be increased by 10% in the case of equivalent heat transfer area and pressure drop.