Abstract
Heat exchangers with unique specifications are administered in the food industry, which has expanded its sphere of influence even to the automotive industry due to this feature. It has been used for convenient maintenance and much easier cleaning. In this study, two different nanomaterials, such as Cu-based nanoparticles and an organic nanoparticle of Chloro-difluoromethane (R22), were used as nanofluids to enhance the efficiency of heat transfer in a turbulator. It is simulated by computational fluid dynamics software (Ansys-Fluent) to evaluate the Nusselt number versus Reynolds number for different variables. These variables are diameter ratio, torsion pitch ratio, and two different nanofluids through the shell tube heat exchanger. It is evident that for higher diameter ratios, the Nusselt number has been increased significantly in higher Reynolds numbers as the heat transfer has been increased in turbulators. For organic fluids (R22), the Nusselt number has been increased significantly in higher Reynolds numbers as the heat transfer has been increased in turbulators due to the proximity of heat transfer charges. At higher torsion pitch ratios, the Nusselt number has been increased significantly in the higher Reynolds number as the heat transfer has been increased in turbulators, especially in higher velocities and pipe turbulence torsions.
Highlights
The heat exchanger is used to transfer heat efficiently between two fluids to another [1,2,3]
The Nusselt number has been increased for higher diameter ratios, especially in higher Reynolds numbers, as the heat transfer has been increased in turbulators
The amount of numerical error of the coefficient of friction between both numerical solutions in the inner and outer walls is negligible, which shows a good agreement between the results of these solutions
Summary
The heat exchanger is used to transfer heat efficiently between two fluids (gas or liquid) to another [1,2,3]. Ho et al conducted a limited-volume numerical study to investigate the free heat transfer of water/aluminum oxide in a cylindrical chamber with insulated inner walls and hot and cold outer walls Based on their findings, the choice of different models for viscosity predicts different values for the Nusselt number [54, 55]. Jahanshahi et al conducted an experimental and numerical study with a finite volume method to investigate the free heat transfer of water/silicon oxide in square chambers with hot and cold vertical walls and horizontal insulated walls According to their findings, the average unsalted number in all Riley numbers increases with the increasing volume fraction of nanoparticles [59]. One of the reasons for this choice is the current applications of this geometry in thermal insulation processes, cooling of various rotating machine components, and energy management in general
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