Interaction of vortices induced by fixed-distance columns with Dean vortices increases the local heat transfer on the convex surface contacting with the wake region of the column in spiral plate heat exchanger

IF 5 2区工程技术 Q1 ENGINEERING, MECHANICAL

International Journal of Thermal Sciences Pub Date : 2025-09-18 DOI:10.1016/j.ijthermalsci.2025.110313

Bo Hou , Liang-Bi Wang , Zhi-Min Lin , Song Liu , An-Ning Guo

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引用次数: 0

Abstract

A spiral plate heat exchanger has two main geometrical characteristics: the curved channels, and the fixed distance columns that are indispensable. Dean vortices exit in the curved channels, and as fluid flow passes the fixed-distance columns, other types of vortices are produced. These vortices may interact and produce unexpected effects on fluid flow and heat transfer. This study investigates the interaction between these vortices using a numerical method. To reveal the interaction of vortices easily, the straight channels (STC), the straight channels with fixed-distance columns (STC-FDC), Archimedean spiral channel (ASC), and Archimedean spiral channel with fixed distance columns (ASC-FDC) are selected, and vortices in these channels are compared. The results reveals that the interaction of vortices produces two stronger longitudinal vortices downstream every fixed distance column, the cores of the newly formed vortices are near the convex wall, which boosts local heat transfer greatly on the convex wall contacting with the wake region in ASC-FDC and slightly on the concave wall. Compared to STC-FDC, the average Nusselt number of ASC-FDC rises by 25 %, the friction factor increases by 70 %. Compared to the ASC, the average Nusselt number on the convex wall of ASC-FDC increases by 75 % and on the concave wall by 10 %, but friction factor rises by 200 %.

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定距柱与迪安涡的相互作用增加了螺旋板式换热器中与柱尾迹区接触的凸表面的局部换热

螺旋板式换热器有两个主要的几何特征：弯曲的通道和不可缺少的定距柱。迪安涡旋在弯曲通道中产生，当流体流过定距柱时，产生其他类型的涡旋。这些涡旋可能相互作用并对流体流动和传热产生意想不到的影响。本文用数值方法研究了这些涡旋之间的相互作用。为了更好地揭示涡旋的相互作用，选择了直线型通道（STC）、固定距离柱形通道（STC- fdc）、阿基米德螺旋通道（ASC）和固定距离柱形通道（ASC- fdc），并对这些通道中的涡旋进行了比较。结果表明：涡的相互作用在下游每隔一段固定距离柱上产生两个较强的纵向涡，新形成的涡核位于凸壁上，对ASC-FDC内与尾迹区接触的凸壁上的局部换热促进作用较大，对凹壁上的局部换热促进作用较小；与STC-FDC相比，ASC-FDC的平均努塞尔数提高了25%，摩擦系数提高了70%。与ASC相比，ASC- fdc的凸壁面平均努塞尔数增加了75%，凹壁面平均努塞尔数增加了10%，但摩擦系数增加了200%。

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.