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 : 2025-01-07 DOI:10.1016/j.csite.2025.105757

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

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引用次数: 0

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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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.