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首页> 外文期刊>International Journal of Thermal Sciences >A comprehensive analysis and empirical correlations for Nusselt number, friction factor and exergy destruction of helical tube equipped with spring-wire
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A comprehensive analysis and empirical correlations for Nusselt number, friction factor and exergy destruction of helical tube equipped with spring-wire

机译：钢管篮网篮网摩擦因子，摩擦因子和螺旋管的出土的综合分析及经验相关性

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摘要

Although different kinds of turbulators are employed through the straight tubes, spring-wire is the only applicable turbulator for helical tubes which has been recently proposed by some researchers. The geometrical characteristics of spring-wire (including wire-diameter, spring-diameter and spring-pitch) severely affect the thermal, frictional and exergetic behavior of fluid flow through the helical tubes. In this research, spring-wire (with different geometries) is employed as a turbulator for helical tube to provide empirical correlations of Nusselt number, friction factor and exergy destruction for spring wire through the helical tubes (as the functions of flow parameters and geometric characteristics) which have not been provided before. It is noted that, the correlations of the straight tubes (equipped with turbulator) cannot be employed for helical tubes. Notable thermal/exergetic behaviors were observed for spring-wire though helical tubes. Larger wire-diameter of turbulator provided higher heat transfer coefficient and higher Nusselt number. Smaller spring-pitch provided higher heat transfer coefficient but lower Nusselt number. Indeed, higher heat transfer coefficient does not necessarily mean higher Nusselt number for spring-wire turbulators which is explained in detail in this study.
机译：尽管通过直管采用不同种类的湍流器，但弹簧线是用于螺旋管的唯一适用的湍流器，其最近由一些研究人员提出。弹簧线（包括导线直径，弹簧和弹簧间距）的几何特性严重地影响流体流过螺旋管的热量，摩擦和前进行为。在该研究中，弹簧线（具有不同的几何形状）作为螺旋管的湍流，以提供露珠数，摩擦因子和通过螺旋管的弹簧线的经验相关性（作为流动参数的功能和几何特性。 ）之前没有提供过。注意，直线管（配备有湍流器）的相关性不能用于螺旋管。对于螺丝虽然螺旋管，观察到显着的热/锻炼行为。湍流较大的湍流直径提供了更高的传热系数和更高的纽带数。较小的弹簧间距提供较高的传热系数但较低的营养数。实际上，较高的传热系数不一定是在本研究中详细说明的弹簧线湍流器的更高的篮板号。

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