管壳式换热器壳程高黏度流体的传热强化

It is a key factor to increase heat transfer coefficien t of high viscosity fluid in the shell side for making a high performance cooler.T he heat transfer and flow resistance performance of trapezoid fin tube high visc osity fluid cooler with helical or segmental baffles were studied, and compared with the heat transfer coefficient of low-fin-tube cooler with segmental baffl es. Experimental results indicated that heat transfer film coefficient in the sh ell side of trapezoid fin tube cooler with entire helical baffles was 60% more h igher than that of low-fin-tube cooler with segmental baffles,and pressure dr op was lower by 40%. Heat transfer film coefficient in the shell side of trapezo id fin tube cooler with entire helical baffles was 20% more higher than that of trapezoid-fin tube cooler with segmental baffles, and pressure drop was lower b y 50%.Heat transfer film coefficient in the shell side of trapezoid fin tube coo ler with entire helical baffles was 10% higher than that of trapezoid fin tube c ooler with sectional helical baffles, and pressure drop was lower by 19%.Heat tr ansfer film coefficient in the shell side of trapezoid fin tube cooler with segm ental baffles was 30% more higher than that of low-fin-tube cooler with segmen tal baffles, and pressure drop remained unchanged.

侧置梯形翼翅片管换热器流动与传热特性

针对某翅片管换热器的设计开发,应用RNG k-模型及SIMPLE算法,研究了侧置梯形翼纵向涡发生器的翅片管换热器和平直翅片管换热器在顺排和叉排两种排列方式下其流动与换热耦合特性。在雷诺数500~4 000的范围内,采用侧置梯形翼涡流发生器,顺排布置时,翅片管换热器综合性能因子提高了9.43%~22.67%,叉排布置时,综合性能因子提高了4.89%~14.87%。研究结果表明,侧置梯形翼涡流发生器可以有效地改善温度场和速度场的协同性,提高其换热能力,为设计高性能换热装置提供了参考。

不同型面纵肋管束的综合能量特性研究

在研究得出梯形和矩形两种型面纵肋管束传热性能及流阻性能的基础上，依据换热过程的热力学能量原理，着重分析两肋片管束换热器的能量特性，探讨管束节距、肋高及厚度等结构参数和雷诺数及热流密度等工况参数对其能量利用的影响。研究结果表明：同为纵肋管束，但由于肋片截面形式不同，梯形和矩形纵肋管束综合能量利用程度差异较大；在相同的结构和工况条件下。

梯形和矩形纵肋管束特性研究及性能比较

研究得出梯形和矩形纵肋管束传热性能及流阻性能关系式，并着重分析两种纵助管束换热器的特性差异深入探讨了管束节距、肋高及厚度对传热和流阻性能的影响研究结果表明,即使同为纵助管束，由于肋片截面形式不同，其性能差异较大，换热程度相差-11％～34％，而流阻程度差距最高可达12倍梯形纵肋管束表现出更良好的低流阻特性和能量综合利用性能横向密排布置时，纵肋管束较光管管束具有更低的流阻特性和一定的传热增强作用。