Graphical '/> Heat transfer and pressure drop characteristics of inclined elliptical fin tube heat exchanger of varying ellipticity ratio using CFD code
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首页> 外文期刊>International Journal of Heat and Mass Transfer >Heat transfer and pressure drop characteristics of inclined elliptical fin tube heat exchanger of varying ellipticity ratio using CFD code
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Heat transfer and pressure drop characteristics of inclined elliptical fin tube heat exchanger of varying ellipticity ratio using CFD code

机译：使用CFD代码改变椭圆率的倾斜椭圆翅片管热交换器的传热和压降特性

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Graphical abstractDisplay OmittedHighlights•Effect of inclined elliptical fin tube heat exchanger is analysed numerically.•Effect of turbulence models on fin tube heat exchanger is analyzed numerically.•Influence of transitional regime on heat transfer characteristics is examined.•Friction factor and pressure drop increases with increases in tube inclination.•Colburn factor is maximum at 20° tube inclination for 0.6 ellipticity ratio.AbstractA three-dimensional computational fluid dynamics (CFD) investigation of the friction and heat transfer characteristics of a fin tube heat exchanger having elliptical tubes of various ellipticity ratio and orientation of these tubes to the horizontal are analysed in this study. Air in the transitional regime is considered as the working fluid in this present study. Numerical validation of the predicted results by ANSYS Fluent 15.0 is carried out by comparing the simulated results with the numerical results a obtained by Bhuiyan et al. (2013). Reynold’s number at inlet is varied in the range of 1300–1600 and Standard k-ω turbulence model is used for turbulent closure. The ellipticity ratio of the tubes utilized for the analysis ranges between 0.6 and 0.8 and the effect of rotation of these tubes on Colburn factor, friction factor and efficiency index has been analysed. The Colburn factor increased initially reaching a peak, after which it gets lowered with increase in tube inclination. Increase in ellipticity and Reynold’s number decreased the Colburn factor. Friction factor varies in direct proportion to tube inclination and ellipticity ratio, whereas it decreases with the increase in Reynold’s number. The efficiency index parameter for all the models has been evaluated.
机译： 图形摘要 省略显示 突出显示 • 对倾斜的椭圆形翅片管热交换器的效果进行了数值分析。 • 湍流模型对翅片管换热器的影响进行了分析 • 研究了过渡方式对传热特性的影响。 • 摩擦系数和压降随着管倾斜度的增加而增加。 • 在椭圆率为0.6的情况下，当管子倾斜20°时，柯氏系数最大。 ce：para> 摘要 三维计算流体动力学（CFD）研究在这项研究中分析了具有不同椭圆率的椭圆管的翅片管热交换器的摩擦和传热特性，以及这些管相对于水平方向的取向。在本研究中，过渡态的空气被视为工作流体。通过将模拟结果与Bhuiyan等人获得的数值结果进行比较，对ANSYS Fluent 15.0的预测结果进行了数值验证。 （2013）。入口处的雷诺数在1300–1600之间变化，标准的k-ω湍流模型用于湍流闭合。用于分析的管的椭圆率在0.6到0.8之间，并且分析了这些管的旋转对Colburn因子，摩擦因子和效率指数的影响。科尔本因子最初增加时达到一个峰值，此后随着管倾斜度的增加而降低。椭圆率的增加和雷诺数的减少使科尔本因子降低。摩擦系数与管的倾斜度和椭圆率成正比，而随雷诺数的增加而减小。已经评估了所有模型的效率指标参数。

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