摘要
为了深入了解单排管翅式换热器换热和流动特性,在雷诺数为100～600之间,翅片间空气为定常层流条件下,利用复合坐标网格系统及对流、导热相结合的数值分析方法,对5种不同几何参数平板翅紧凑管翅式换热器的流场、温度场、换热系数、传热量、压降、翅片效率进行了模拟计算和分析.结果表明：翅片越薄,单位体积、单位质量的传热量越大;在一定雷诺数条件下,存在一个最佳的翅片间距,并使得换热量最大;对所讨论的5种情况来说,当雷诺数为400时,翅片宽度较小的换热器的总传热量比其他4类高10%左右,但压力损失的降低变化不大.无论在哪种条件下,翅片后半部的传热量占全部传热量的25%以下,并且当雷诺数较低时,该比例会更低.
For understanding of flowing and heat transfer characteristics of plate-fin tube heat exchangers with one row tube, this paper adopted the block-structured grid system and numerical calculation method of heat conduction and heat convection combine together, carried out the numerical computations of velocity field, temperature field, fin efficiency and pressure loss for three-dimensional steady flows of five different types plate-fin tube heat exchanger with one row tube in Reynolds number between 100- 600. The effects of different geometric parameters on flow and heat transfer performance have been investigated. The results show that： the thinner the fin thickness, the more the heat transfer capacity of per unit volume and per unit mass. There is an optimum fin pitch in a given Reynolds number. When Reynolds number is 400, the heat exchanger with the lowest fin width has a 10% increase in the heat transfer capacity than other above-mentioned 5 types, and the change of the pressure loss is smaller. Heat transfer capacity of second half of the fin is 25% of total heat transfer capacity, and also this proportion becomes smaller in low Reynolds number.
出处
《西安科技大学学报》
CAS
北大核心
2007年第2期182-186,共5页
Journal of Xi’an University of Science and Technology
基金
陕西省自然科学基金项目(2006E130)
关键词
紧凑式换热器
节能
强化换热
数值模拟
compact heat exchanger
energy saving
heat transfer enhancement
numerical simulation
