Entropy generation analysis of a confined slot impinging jet in a converging channel for a shear thinning nanofluid

Yousefi-Lafouraki, Babak; Ramiar, Abas; Mohsenian, S.

doi:10.1016/j.applthermaleng.2016.03.067

Cited by 28 publications

(7 citation statements)

References 19 publications

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“…It was noted that many studies were needed to shed some light on the processes because of the uncertainties in the interactions of different parameters and presence of complicated random processes. J-I cooling has been considered with nanofluids by taking into account the nanoparticles shape effects (Shirvani et al , 2021, Selimefendigil and Öztop 2017a), curvature of the cooled surface (Chen and Cheng 2020, Selimefendigil and Öztop 2017b) and non-Newtonian aspects of the nanofluid (Lamraoui et al 2019, Qiang et al , 2018, Yousefi-Lafouraki et al , 2016, Selimefendigil, Oztop and Chamkha 2021b).…”

Section: Introductionmentioning

confidence: 99%

Utilization of wavy porous layer, magnetic field and hybrid nanofluid with slot jet impingement on the cooling performance of conductive panel

Ouni

Selimefendigil

Besbes

et al. 2022

HFF

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Purpose The purpose of this study is to analyze the impacts of combined utilization of multi-jet impinging cooling of nanofluids with magnetic field and porous layer on the cooling performance, as effective cooling with impinging jets are obtained for various energy systems, including photovoltaic panels, electronic cooling and many other convective heat transfer applications. Design/methodology/approach Finite element method is used to explore the magnetic field effects with the inclusion of porous layer on the cooling performance efficiency of slot nanojet impingement system. Impacts of pertinent parameters such as Reynolds number (Re between 250 and 1,000), strength of magnetic field (Ha between 0 and 30), permeability of the porous layer (Da between 0.001 and 0.1) on the cooling performance for flat and wavy surface configurations are explored. Findings It is observed that the average Nusselt number (Nu) rises by about 17% and 20.4% for flat and wavy configuration while temperature drop of 4 K is obtained when Re is increased to 1,000 from 250. By using magnetic field at the highest strength, the average Nu rises by about 29% and 7% for flat and wavy cases. Porous layer permeability is an effective way of controlling the cooling performance while up to 44.5% variations in the average Nu is obtained by varying its value. An optimization routine is used to achieve the highest cooling rate while the optimum parameter set is obtained as (Re, Ha, Da, γ, sx) = (1,000, 30, 0.07558, 86.28, 2.585) for flat surface and (Re, Ha, Da, γ, sx) = (1,000, 30, 0.07558, 71.85, 2.329) for wavy surface configurations. Originality/value In thermal systems, cooling system design is important for thermal management of various energy systems, including fuel cells, photovoltaic panels, electronic cooling and many others. Impinging jets are considered as effective way of cooling because of its ability to give higher local heat transfer coefficients. This paper offers novel control tools, such as magnetic field, installation of porous layer and hybrid nano-liquid utilization for control of cooling performance with multiple impinging jets.

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Section: Introductionmentioning

confidence: 99%

Utilization of wavy porous layer, magnetic field and hybrid nanofluid with slot jet impingement on the cooling performance of conductive panel

Ouni

Selimefendigil

Besbes

et al. 2022

HFF

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“…Nanofluid technology is a very popular topic nowadays, and applications in diverse renewable/nonrenewable energy systems including power generation, refrigeration, energy storage, and thermal management were considered [23][24][25][26][27][28][29][30][31]. In J-I cooling, nanofluids' potential on the performance improvements were shown in various studies, while thermal efficiency depends upon the nanoparticle type, its amount in the base fluid, and its size and shape [32][33][34][35][36][37][38]. The potentials of using nanofluids with MaF were reviewed in several studies [39,40].…”

Section: Introductionmentioning

confidence: 99%

Multiple Impinging Jet Cooling of a Wavy Surface by Using Double Porous Fins under Non-Uniform Magnetic Field

et al. 2022

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Coupled effects of double porous fins and inhomogeneous magnetic field on the cooling performance of multiple nanojet impingement for a corrugated surface were numerically analyzed. Different values of magnetic field parameters (strength, inclination, and amplitude of spatially varying part) and double porous fin parameters (inclination and permeability) were used, while finite element method is used as the solution method. When parametric computational fluid dynamics (CFD) simulations were performed, there were 162.5% and 34% Nusselt number (Nu) enhancement with magnetic field for flat and wavy surfaces, respectively. The variations of average Nu became 36% and 24% when varying the inclination and amplitude of inhomogeneous magnetic for a flat surface, while the amounts were 43.7% and 32% for a corrugated one. The vortex distribution in between the jets and cooling performance was affected by the variation of double porous fin permeability and inclination. An optimization method was used for the highest cooling performance, while the optimum set of parameters was obtained at (Ha, Amp, Da, Ω) = (0.224, 0.5835, 7.59×10−4, 0.1617). By using the double porous fins and inhomogeneous magnetic field, excellent control of the cooling performance of multiple impinging jet was obtained.

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“…In the experimental work, they noted 40% enhancement in the heat transfer coefficient at the highest volume fraction of nanoparticles as compared to pure water. Some other applications of nano-jet impingement cooling heat transfer were also considered with magnetic field effects (Nakharintr and Naphon, 2017; Selimefendigil and Oztop, 2020), porous media (Izadi et al , 2019; Siavashi et al , 2019) and non-Newtonian fluid model (Lamraoui et al , 2019; Youse-Lafouraki et al , 2016).…”

Section: Introductionmentioning

confidence: 99%

A computational analysis on convective heat transfer for impinging slot nanojets onto a moving hot body

Coşanay

Öztop

Selimefendigil

2021

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Purpose The purpose of this study is to perform computational analysis on the steady flow and heat transfer due to a slot nanojet impingement onto a heated moving body. The object is moving at constant speed and nanoparticle is included in the heat transfer fluid. The unsteady flow effects and interactions of multiple impinging jets are also considered. Design/methodology/approach The finite volume method was used as the solver in the numerical simulation. The movement of the hot body in the channel is also considered. Influence of various pertinent parameters such as Reynolds number, jet to target surface spacing and solid nanoparticle volume fraction on the convective heat transfer characteristics are numerically studied in the transient regime. Findings It is found that the flow field and heat transfer becomes very complicated due to the interaction of multiple impinging jets with the movement of the hot body in the channel. Higher heat transfer rates are achieved with higher values of Reynolds number while the inclusion of nanoparticles resulted in a small impact on flow friction. The middle jet was found to play an important role in the heat transfer behavior while jet and moving body temperatures become equal after t = 80. Originality/value Even though some studies exist for the application of jet impingement heat transfer for a moving plate, the configuration with a solid moving hot body on a moving belt under the impacts of unsteady flow effects and interactions of multiple impinging jets have never been considered. The results of the present study will be helpful in the design and optimization of various systems related to convective drying of products, metal processing industry, thermal management in electronic cooling and many other systems.

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Entropy generation analysis of a confined slot impinging jet in a converging channel for a shear thinning nanofluid

Cited by 28 publications

References 19 publications

Utilization of wavy porous layer, magnetic field and hybrid nanofluid with slot jet impingement on the cooling performance of conductive panel

Utilization of wavy porous layer, magnetic field and hybrid nanofluid with slot jet impingement on the cooling performance of conductive panel

Multiple Impinging Jet Cooling of a Wavy Surface by Using Double Porous Fins under Non-Uniform Magnetic Field

A computational analysis on convective heat transfer for impinging slot nanojets onto a moving hot body

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