Heat transfer in a 3D cubic shell heat exchanger with rotating tubes and turbulent flow

IF 6.4 2区工程技术 Q1 THERMODYNAMICS Case Studies in Thermal Engineering Pub Date : 2025-02-01 Epub Date: 2025-01-07 DOI:10.1016/j.csite.2025.105757

Athraa Hameed Turki , Ali Khaleel Kareem , Ali M. Mohsen

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Abstract

This study investigated the thermal performance enhancement in a cubic shell heat exchanger (CSHE) equipped with rotating tubes and utilizing nanofluids under turbulent flow conditions. Water based nanofluids using Al₂O₃, SiO₂, ZnO, and CuO nanoparticles (diameters from 20 nm to 80 nm) were utilized under turbulent flow with concentrations ranging from 0 % to 2 %. The numerical simulations were carried out using the Reynolds-averaged Navier-Stokes (RANS) solver and the realizable k-ε turbulence model. It is shown a highest increase in Nusselt number of 15 % was achieved when using a 20 nm SiO₂ nanoparticles suspended in water compared to pure water. Further improvement in Nusselt number by up to 10 % was observed by increasing the nanoparticles volume fraction to 2 %. For Reynold’s numbers between 15000 and 30000, a 20 % improvement in the heat transfer was obtained due to increased turbulence. Surprisingly, the rotating inner tube introduced minimal effect compared to stationary configuration, with stationary tube slightly outperforming the rotating ones in most cases. The data suggests that significant enhancement in heat exchanger performance can be achieved by optimizing nanofluids properties and Reynold’s numbers, while tube rotations provided no additional benefits to the efficiency of the facility.

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具有旋转管和紊流的三维立方壳换热器的传热特性

在紊流条件下，研究了纳米流体对装有旋转管的立方壳换热器（CSHE）热性能的增强。使用Al₂O₃、SiO₂、ZnO和CuO纳米颗粒（直径从20 nm到80 nm）的水基纳米流体在湍流中使用，浓度从0%到2%不等。采用reynolds -average Navier-Stokes （RANS）求解器和可实现的k-ε湍流模型进行了数值模拟。结果表明，与纯水相比，使用悬浮在水中的20纳米二氧化硅纳米颗粒可使努塞尔数增加15%。通过将纳米颗粒体积分数增加到2%，进一步改善了努塞尔数，提高了10%。当雷诺数在15000到30000之间时，由于湍流的增加，传热性能提高了20%。令人惊讶的是，与固定配置相比，旋转内管的效果最小，在大多数情况下，固定内管的性能略优于旋转内管。数据表明，通过优化纳米流体特性和雷诺数，可以显著提高热交换器的性能，而管的旋转对设备的效率没有额外的好处。

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.