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化工进展  2015 

自旋扭带强化传热及旋转特性

DOI: 10.16085/j.issn.1000-6613.2015.06.013, PP. 1582-1587

Keywords: 自旋扭带,强化传热,摩擦因子,数值模拟,场协同,扭带选型

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Abstract:

旋转扭带是在固定式扭带基础上发展而来的,因其特殊结构所以能在管内流体作用下产生自旋效果。本文对自旋式扭带旋转特性及强化传热特性进行研究。通过理论及实验研究管内自旋扭带旋转特性后得出扭率越小,扭带克服阻力起始旋转需要的流体速度越小;扭带转速与管内流体流速呈一次线性关系,且扭带节距不变时线性比例基本保持不变。通过实验研究后得出自旋扭带能达到很好的强化传热性能,扭率越小其强化传热性能越明显,同时阻力特性也越明显,在雷诺数为4×103~4×104、扭率为3~8时,换热管内摩擦因子增至1.7~3.5倍,努赛尔数增幅为10%~37%。本文使用评估指标η对扭带进行综合评价,得出扭率为7的自旋扭带具有最佳的综合性能。并分别拟合出摩擦因子及努赛尔数与雷诺数、扭率之间的关联式,提出一种工程上自旋扭带选型方法。

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