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Comparative thermal hydraulic performance analysis on helical screw insert in tube with different number of strips in transition flow regime
Heat and Mass Transfer ( IF 2.2 ) Pub Date : 2020-08-17 , DOI: 10.1007/s00231-020-02934-6
Shashank Ranjan Chaurasia , R. M. Sarviya

The experimental analysis is arranged to evaluate thermal hydraulic performance on flow of fluid in the tube with helical screw inserts at numbers of strips and different values of twist ratio at transition flow regime. Single strip helical screw insert is also compared with double strip helical screw inserts at values of twist ratio. Further, the CFD analysis is carried out to visualize thermohydraulic characteristics on present analysis with kklw model. The Nusselt number is shown enhancement with double strip than single strip helical screw inserts at increased values of Reynolds number and decreased values of twist ratio. Friction factor is found enhancement with double strip than single strip helical screw inserts at decreasing values of Reynolds number and twist ratio. A maximum enhancement of 2.82 times in value of Nusselt number is achieved with double strip helical screw inserts at twist ratio of 1.5 and Reynolds number of 2300 as compared with plain tube. Further, common correlations of Nusselt number and friction factor are also developed. Higher enhancement in the values of thermal performance factor is achieved with double strip than single strip helical screw inserts. A maximum value of thermal performance factor of 1.29 is achieved with double strip helical screw insert at twist ratio of 2.5 and low value of Reynolds number. It is observed that double strip helical screw inserts show suitability for miniaturization of heat exchanger which could be beneficial for efficient thermal applications as solar water heater, electronic cooling devices, automobile radiator, power plants etc.



中文翻译:

过渡流动状态下不同条带数量的管中螺旋螺杆插入件的比较热工水力性能分析

安排了实验分析,以评估带螺旋数量的条带和过渡流动状态下不同的扭曲比值的管内流体流动的热力性能。还比较了单条带斜齿螺旋刀片与双条带斜齿螺旋刀片的扭曲比值。此外,进行CFD分析以可视化当前分析中k - kl - w的热工水力特性模型。在增加雷诺数值和减小扭曲比值时,显示出双带状Nusselt数比单带状螺旋螺塞增强。发现在雷诺数和扭曲比减小的情况下,双条带的摩擦系数比单条带螺旋的螺杆嵌件增强。与普通管相比,双条螺旋螺钉插入件在1.5的扭曲比和2300的雷诺数的情况下,可将Nusselt值最大提高2.82倍。此外,还建立了努塞尔数和摩擦系数的共同相关性。与单条螺旋螺钉相比,双条实现了热性能系数值的更高提高。热性能系数的最大值为1。图29是用双条螺旋螺钉插入件以2.5的扭曲比和低雷诺数获得的。观察到,双条螺旋螺钉插入件显示出适合于热交换器的小型化的趋势,这可能有益于高效的热应用,例如太阳能热水器,电子冷却装置,汽车散热器,发电厂等。

更新日期:2020-08-18
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