Conjugated non-Newtonian phase change process in a shell and tube heat exchanger: A parametric-geometric analysis

Fadaei, Mojtaba; Izadi, Mohsen; Assareh, Ehsanolah; Ershadi, Ali

doi:10.1016/j.applthermaleng.2022.119795

Cited by 21 publications

(5 citation statements)

References 39 publications

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“…This sector focuses on using helical or spiral coil tubes to improve thermal efficiency in thermal systems. The use of spiral tubes increases the heat exchange area, resulting in better heat exchange (Alimoradi et al 2017 , Zheng et al 2018 , Saydam et al 2019 , Fadaei et al 2023 ).…”

Section: Methods Of Improving Heat Transfer In Fpscsmentioning

confidence: 99%

Recent progress on flat plate solar collectors equipped with nanofluid and turbulator: state of the art

Zaboli,

Saedodin,

Ajarostaghi

et al. 2023

Environ Sci Pollut Res

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This paper reviews the impacts of employing inserts, nanofluids, and their combinations on the thermal performance of flat plate solar collectors. The present work outlines the new studies on this specific kind of solar collector. In particular, the influential factors upon operation of flat plate solar collectors with nanofluids are investigated. These include the type of nanoparticle, kind of base fluid, volume fraction of nanoparticles, and thermal efficiency. According to the reports, most of the employed nanofluids in the flat plate solar collectors include Al2O3, CuO, and TiO2. Moreover, 62.34%, 16.88%, and 11.26% of the utilized nanofluids have volume fractions between 0 and 0.5%, 0.5 and 1%, and 1 and 2%, respectively. The twisted tape is the most widely employed of various inserts, with a share of about one-third. Furthermore, the highest achieved flat plate solar collectors’ thermal efficiency with turbulator is about 86.5%. The review is closed with a discussion about the recent analyses on the simultaneous use of nanofluids and various inserts in flat plate solar collectors. According to the review of works containing nanofluid and turbulator, it has been determined that the maximum efficiency of about 84.85% can be obtained from a flat plate solar collector. It has also been observed that very few works have been done on the combination of two methods of employing nanofluid and turbulator in the flat plate solar collector, and more detailed work can still be done, using more diverse nanofluids (both single and hybrid types) and turbulators with more efficient geometries.

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Section: Methods Of Improving Heat Transfer In Fpscsmentioning

confidence: 99%

Recent progress on flat plate solar collectors equipped with nanofluid and turbulator: state of the art

Zaboli,

Saedodin,

Ajarostaghi

et al. 2023

Environ Sci Pollut Res

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“…[16] The convection heat transfer process is typically modeled by establishing dimensionless control equations and using a finite element numerical approach. [17][18][19][20] The melting process of phase-change material in the square cavity was evaluated using the enthalpy-porosity method. A higher temperature gradient was observed at the melting point, and the melting was accelerated by an increase in the heat transfer rate.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer and Melting Characteristics of Calcium‐Cored Wire in Molten Steel

Guo,

Chen,

2023

steel research int.

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To accurately describe the heat transfer and melting characteristics of a calcium‐cored wire in molten steel, the finite difference method is used in theoretical calculations to solve the relationship between the melting temperature, radius, and time. Numerical simulations are performed using the Eulerian–Eulerian method to characterize the temperature distribution at different periods. The results show that the radius of the calcium wire and steel shell both decrease and the melting rate gradually increases. The calcium‐cored wire has a fish‐scale temperature distribution, with the temperature decreasing from a maximum at the front down to the tail end and increasing outward from the center axis. The temperature of the wire core is 1120 K at 0.272 s, indicating the complete melting of the pure internal calcium. The temperature of the calcium wire–steel shell interface reaches 1793 K at 0.979 s and remains from 1645 to 1757 K at the front of calcium wire. The steel shell melts through, and calcium flows into the molten steel in liquid form. The numerical simulation results generally agree with the theoretical calculations, and the reliability of the model is verified by comparison with published studies.

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“…The earliest research has been studied in 1972 by Bear 1 . Vast application area of porous media was studied by researchers 2–31 . The first exact solution was presented for the fluid flow in the interface region with the assumption of Brinkman–Forchheimer extended Darcy equation by Vafai and Kim 32 .…”

Section: Introductionmentioning

confidence: 99%

Exact analytical solution of forced convection through a porous‐saturated duct

et al. 2023

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In the current paper, the effect of a magnetic field on the fully developed forced convective flow and heat transfer is studied. An exact solution is extracted when the flow in the porous medium is governed by the Brinkman-Forchheimer Extended Darcy model. First, the problem formulation is explained to obtain a new system of mathematical formulation. Then, by utilizing the properties which are imposed into the problem, the exact closed-form analytical solution of the problem is explored. Finally, the main results are illustrated to show the impact of the porous media-shaped parameter, magnetic parameter, Forchheimer number, and viscosity ratio. It should be mentioned that the asymptotic results achieved in this study were compared with the exact results and it is found that they are in good agreement.

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Conjugated non-Newtonian phase change process in a shell and tube heat exchanger: A parametric-geometric analysis

Cited by 21 publications

References 39 publications

Recent progress on flat plate solar collectors equipped with nanofluid and turbulator: state of the art

Recent progress on flat plate solar collectors equipped with nanofluid and turbulator: state of the art

Heat Transfer and Melting Characteristics of Calcium‐Cored Wire in Molten Steel

Exact analytical solution of forced convection through a porous‐saturated duct

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