Purpose

This study aims to present a numerical study on the flow and heat transfer performance of a water-cooled tube with protrusions in different geometrical parameters.

Design/methodology/approach

A new type of enhanced heat exchanger tube is designed. Protrusions are formed on the inner surface of the tube by mechanical expansion, compression and other processing methods. A three-dimensional numerical symmetry model is established by ANSYS for studying the influence of protrusion distance, protrusion radius and protrusion arrangement on flow and heat transfer characteristics in turbulent flow.

Findings

The results show that the protrusions increase the heat transfer area and improve the heat transfer effect but also increase the flow resistance. Performance evaluation criteria (PEC) is applied to evaluate the flow and heat transfer characteristics of convex tubes. When adopting the aligned protrusions arrangement, the radius of 2 mm and distance of twice the protrusion radius is most heat transfer effect. The PEC of protrusion tubes with a staggered arrangement are higher than those in aligned arrangement, and the maximum value is 2.36 when Reynolds number is 12,000.

Originality/value

At present, most of the protrusion technology applications are based on the cold plate heat dissipation of electronic devices, and the flow path is rectangular. Convex tube heat exchanger is a high-efficiency heat exchanger, which uses convex tubes instead of smooth tubes in tubular heat exchangers to enhance heat transfer and widely used in petroleum, chemical, textile, oil refining and other industries.

中文翻译：

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具有突起的水冷管的流动和传热特性研究

目的

这项研究的目的是对具有不同几何参数的突起的水冷管的流动和传热性能进行数值研究。

设计/方法/方法

设计了一种新型的强化换热管。通过机械膨胀，压缩和其他加工方法在管的内表面上形成突起。ANSYS建立了三维数值对称模型，研究了凸出距离，凸出半径和凸出排列对湍流流动和传热特性的影响。

发现

结果表明，这些突起增加了传热面积，改善了传热效果，但同时也增加了流动阻力。性能评估标准（PEC）用于评估凸管的流动和传热特性。当采用对齐的突起布置时，半径为2 mm，距离为突起半径的两倍是最有效的传热效果。交错排列的突出管的PEC高于对齐排列的突出管的PEC，当雷诺数为12,000时，最大值为2.36。

创意/价值

目前，大多数的凸出技术应用都是基于电子设备的冷板散热，并且流路是矩形的。凸管式换热器是一种高效换热器，在管式换热器中使用凸管代替光滑管来增强传热，广泛用于石油，化工，纺织，炼油等行业。