Experimental and numerical investigations of local flow and heat transfer characteristics of partially finned flat-oval tubes

IF 4.9 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2024-11-15 DOI:10.1016/j.ijthermalsci.2024.109539

Ye. Pysmennyy, O. Semeniako

引用次数: 0

Abstract

Made is the analysis of the particularities of transfer processes with the transversal washing by gas flow of perspective developed heat transfer surfaces – partially finned flat-oval tubes. The analysis is based on complex experimental and numerical studies of the flow structure, static pressure fields, velocities and intensity of their fluctuations, local heat transfer coefficients, performed at Re from 2,5 × 10⁴ to 5 × 10⁴.

It has been demonstrated that due to such tubes’ constructive features a number of small-scale and low-energy-consuming vortex structures are formed at their surface maintaining a relatively high level of flow disturbance in the interfin space. In conjunction with elevated values of local velocities this results in comparable - with regard to the case of completely finned round tubes - level of heat transfer intensity at significantly lower pressure loss.

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部分翅片式扁椭圆管局部流动和传热特性的实验和数值研究

对透视开发的传热表面--部分翅片扁平椭圆管--在气流横向冲刷下的传热过程的特殊性进行了分析。分析基于对流动结构、静压场、速度及其波动强度、局部传热系数的复杂实验和数值研究，在 Re 值为 2,5 × 104 到 5 × 104 的条件下进行。实验证明，由于这种管子的结构特点，在其表面形成了许多小规模、低耗能的涡旋结构，在管间空间保持了相对较高的流动扰动水平。在局部速度值升高的情况下，传热强度可与完全翅片的圆管相媲美，而压力损失却大大降低。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

International Journal of Thermal Sciences 工程技术-工程：机械

CiteScore

8.10

自引率

11.10%

发文量

531

审稿时长

55 days

期刊介绍： The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review. The fundamental subjects considered within the scope of the journal are: * Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow * Forced, natural or mixed convection in reactive or non-reactive media * Single or multi–phase fluid flow with or without phase change * Near–and far–field radiative heat transfer * Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...) * Multiscale modelling The applied research topics include: * Heat exchangers, heat pipes, cooling processes * Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries) * Nano–and micro–technology for energy, space, biosystems and devices * Heat transport analysis in advanced systems * Impact of energy–related processes on environment, and emerging energy systems The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.