The effect of using circular and porous circular fins on the thermal performance of a shell and helically coiled heat exchanger: A numerical and experimental study
Ataollah Khanlari , Adnan Sözen , Halil İbrahim Variyenli , Azim Doğuş Tuncer , Kambiz Vafai
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引用次数: 0
Abstract
A novel form of shell and helically coiled heat exchangers, which are widely employed in many applications, have been experimentally and numerically investigated in this work. In the current work, it is aimed to use a cost-effective and simple approach for improving heat transfer in a shell and helically coiled heat exchanger. Accordingly, a shell and helically coiled tube heat exchanger has been modified with a guiding tube and circular fins with the aim of guiding cold flow over the helically coil for enhancing heat transfer rate. In the first step of the study, numerical analyses have been conducted in order to reveal the impact of new modification on the heat transfer. In the next step, a modified heat exchanger with guiding tubes and circular fins has been manufactured and experimentally examined with water and ZnFe2O4/water magnetic nanofluid at different working conditions. The overall results of this study demonstrated how well the modified heat exchanger with circular fins and a guiding tube was designed. Adding a guiding tube into the shell part of the heat exchanger led to moderate the fluid flow and circular fins distributed the flow over the coil which upgraded heat transfer. Experimentally obtained results showed that using ZnFe2O4/water nanofluid in the SHCHE averagely upgraded the heat transfer coefficient as 12.4 %. Moreover, the average deviation between numerically and experimentally obtained outlet temperature is 4.1 %.
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.
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