Thermo-hydraulic efficiency enhancing: Optimized ladder fold baffle structure with cam and circle tube bundle

IF 4.9 2区工程技术 Q1 ENGINEERING, MECHANICAL International Journal of Thermal Sciences Pub Date : 2023-10-04 DOI:10.1016/j.ijthermalsci.2023.108680

Alireza Shabani Samghabadia , Ali Akbar Abbasian Arani , Hamed Yosofvand

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Abstract

In this article, the design and thermo-hydraulic efficiency of a shell and tube heat exchanger (STHE) having ladder fold baffle equipped by two configurations with pore and without pore considering two types of tube bundles, cam and circular, are investigated numerically. Three-dimensional STHE is simulated employing the Solid Works Flow Simulation software. A numerical approach is performed for different values of mass flow rate from 0.5 to 2 kg/s, baffle height of 0, 20, and 40, and baffle pitch of 85.7, 60, and 46.15. STHE pressure drop, heat transfer, and efficiency evaluation coefficient (EEC) for different arrangements have been performed to study the STHE fluid flow and heat transfer. Obtained results for a ladder fold baffle and two studied types of tube bundles, cam, and circle, are provided, and thermo-hydraulic performance is compared with the current baffle structure. Based on the obtained results, an increase of 12.2% and 17.4% in pressure drop with increasing baffle height from 0 to 20 mm and from 20 to 40 mm was observed for circular tube bundles without pores, respectively. Related values for the case with pore are 14% and 14%. These values for the cam tube bundle are 12% and 15% without pores and 3% and 9% with pores. In addition, at an angle of 0, 20, and 40° in the case without pore, the EEC factor increased by 2.31%, 15.67%, and 15.47% compared to the case with pore for the cam tube bundle. The perforated ladder fold baffle showed the best performance with pitch and height of 85.7 mm and 40 mm, respectively.

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提高热液效率：采用凸轮和圆管束的优化梯形折叠挡板结构

本文对具有阶梯折流板的管壳式换热器（STHE）的设计和热工水力效率进行了数值研究，该换热器由有孔和无孔两种结构组成，考虑了凸轮和圆形两种管束。采用Solid Works Flow Simulation软件对三维STHE进行了仿真。对0.5至2kg/s的质量流速、0、20和40的挡板高度以及85.7、60和46.15的挡板节距的不同值进行了数值计算。对不同布置的STHE压降、传热和效率评估系数（EEC）进行了研究，以研究STHE流体的流动和传热。给出了梯形折流板和所研究的两种管束（凸轮和圆）的计算结果，并与现有折流板结构的热工水力性能进行了比较。基于所获得的结果，对于没有孔的圆形管束，随着挡板高度从0增加到20mm和从20增加到40mm，压降分别增加了12.2%和17.4%。孔隙情况下的相关值分别为14%和14%。凸轮管束的这些值在没有孔隙的情况下分别为12%和15%，在有孔隙的情况中分别为3%和9%。此外，在没有孔隙的情况下，在0°、20°和40°的角度下，与有孔隙的情况相比，凸轮管束的EEC因子增加了2.31%、15.67%和15.47%。穿孔梯形折叠挡板的节距和高度分别为85.7mm和40mm，表现出最佳性能。

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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.