扭旋叶片组合方式对静态混合器湍流传热性能的模拟分析

Study of Effects and Mechanisms of Heat Transfer Enhancement of Twist Elements Arrangement in Static Mixer

分别对一个截面上安有1～4个扭旋叶片的静态混合器的湍流传热性能进行模拟分析,并利用热量传递势容耗散评价四种组合方式下静态混合器的传热性能。研究结果表明,在相同的粘性耗散条件下,单叶片与双叶片组合的热量传递势容耗散量接近,四叶片组合的热量传递势容耗散量最低,三叶片组合在两者之间;四叶片组合的传热效率最高,三叶片组合次之,双叶片组合与单叶片接近。多叶片组合排列方式形成的多纵向涡明显改善了近壁区二次流速度场与温度场的协同性。

The flow field in a static mixer that has one to four twist elements in corporated in each section has been simulated,and the dissipation of heat transport potential capacity is used to appraise the static mixer＇s heat-transfer property under four combination ways.The results show that the single leaf blade allows the dissipation quantity with the double leaf blade combination＇s heat transfer potential to be close,three leaf blade combination next best,four leaf blade combination＇s heat transfer potential allows the diffusion quantity to be lowest in the same velue of viscous dissipation;Four leaf blade combination＇s heat transfer efficiency is highest,three leaf blade combination next best,the double leaf blade combination and the single leaf blade are close.The multi-leaf blade combination arrangement way forms the multi-longitudinal vortices improves near wall area secondary flow velocity field and the temperature field cooperativity obviously.