Effect of uniform/non-uniform magnetic field and jet impingement on the hydrodynamic and heat transfer performance of nanofluids

Nimmagadda, Rajesh; Haustein, Herman D.; Asirvatham, Lazarus Godson

doi:10.1016/j.jmmm.2019.02.019

Cited by 34 publications

(9 citation statements)

References 44 publications

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“…The advantageous of using NFs have been considered in many studies where MF effects are present. NFs have been used in several works under the impacts MF in HT applications of J-I systems [41][42][43]. The MF was shown to reduce the fluid motion but at the same time, the potentiality of suppressing the vortices established in the thermoflow system and performance improvement were also shown in several other studies [44].…”

Section: Introductionmentioning

confidence: 96%

Jet Impingement Heat Transfer of Confined Single and Double Jets with Non-Newtonian Power Law Nanofluid under the Inclined Magnetic Field Effects for a Partly Curved Heated Wall

2021

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Single and double impinging jets heat transfer of non-Newtonian power law nanofluid on a partly curved surface under the inclined magnetic field effects is analyzed with finite element method. The numerical work is performed for various values of Reynolds number (Re, between 100 and 300), Hartmann number (Ha, between 0 and 10), magnetic field inclination (γ, between 0 and 90), curved wall aspect ratio (AR, between 01. and 1.2), power law index (n, between 0.8 and 1.2), nanoparticle volume fraction (ϕ, between 0 and 0.04) and particle size in nm (dp, between 20 and 80). The amount of rise in average Nusselt (Nu) number with Re number depends upon the power law index while the discrepancy between the Newtonian fluid case becomes higher with higher values of power law indices. As compared to case with n = 1, discrepancy in the average Nu number are obtained as −38% and 71.5% for cases with n = 0.8 and n = 1.2. The magnetic field strength and inclination can be used to control the size and number or vortices. As magnetic field is imposed at the higher strength, the average Nu reduces by about 26.6% and 7.5% for single and double jets with n greater than 1 while it increases by about 4.78% and 12.58% with n less than 1. The inclination of magnetic field also plays an important role on the amount of enhancement in the average Nu number for different n values. The aspect ratio of the curved wall affects the flow field slightly while the average Nu variation becomes 5%. Average Nu number increases with higher solid particle volume fraction and with smaller particle size. At the highest particle size, it is increased by about 14%. There is 7% variation in the average Nu number when cases with lowest and highest particle size are compared. Finally, convective heat transfer performance modeling with four inputs and one output is successfully obtained by using Adaptive Neuro-Fuzzy Interface System (ANFIS) which provides fast and accurate prediction results.

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Section: Introductionmentioning

confidence: 96%

Jet Impingement Heat Transfer of Confined Single and Double Jets with Non-Newtonian Power Law Nanofluid under the Inclined Magnetic Field Effects for a Partly Curved Heated Wall

2021

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“…Further, no numerical investigation has been reported on the comparative nature of hydrodynamic/heat transfer performance of jet impingement over stationary and vibrating plates with the use of carbon nanofluids containing particles with different sphericity (single-walled nanotubes, nanorods and nanosheets). Moreover, Nimmagadda et al (2019) and Nakharintr and Naphon (2017) supported the implementation of magnetic field for heat transfer augmentation. However, Selimefendigil and Oztop (2018a, 2018b, 2018c, 2018d) showed that magnetic field retards the fluid flow and reduces the heat transfer.…”

Section: Introductionmentioning

confidence: 87%

“…As stated by Nakharintr and Naphon (2017), application of different magnetic field can not only affect the nanofluids thermophysical properties but also influence the motion, direction and migration of the nanoparticles with significant effect on the heat transfer augmentation. A maximum heat transfer enhancement of 173 per cent was observed with the use of 3 vol.% Cu nanofluid under the influence of uniform and non-uniform magnetic fields in jet impingement (Nimmagadda et al , 2019). However, Selimefendigil and Oztop (2018a, 2018b, 2018c, 2018d) observed that magnetic field retarded the fluid flow and reduced the local and average heat transfer in jet impingement cooling.…”

Section: Introductionmentioning

confidence: 99%

Effect of magnetic field and nanoparticle shape on jet impingement over stationary and vibrating plates

Nimmagadda

Asirvatham

2019

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Purpose The purpose of this study is to numerically investigate the effect of jet impingement, magnetic field and nanoparticle shape (sphericity) on the hydrodynamic/heat transfer characteristics of nanofluids over stationary and vibrating plates. Design/methodology/approach A two-dimensional finite volume method-based homogeneous heat transfer model has been developed, validated and used in the present investigation. Three different shapes of non-spherical carbon nanoparticles namely nanotubes, nanorods and nanosheets are used in the analysis. Sphericity-based effective thermal conductivity of nanofluids with Brownian motion of nanoparticles is considered in the investigation. Moreover, the ranges of various comprehensive parameters used in the study are Re = 500 to 900, St = 0.0694 to 0.2083 and Ha = 0 to 80. Findings The hydrodynamic/heat transfer performance of jet impingement in the case of vibrating plate is 298 per cent higher than that of stationary plate at Re = 500. However, for the case of vibrating plate, a reduction in the heat transfer performance of 23.35 per cent is observed by increasing the jet Reynolds number from 500 to 900. In the case of vibrating plate, the saturation point for Strouhal number is found to be 0.0833 at Re = 900 and Ha = 0. Further decrement in St beyond this limit leads to a drastic reduction in the performance. Moreover, no recirculation in the flow is observed near the stagnation point for jet impingement over vibrating plate. It is also observed that the effect of magnetic field enhances the performance of jet impingement over a stationary plate by 36.18 per cent at Ha = 80 and Re = 900. Whereas, opposite trend is observed for the case of vibrating plate. Furthermore, at Re = 500, the percentage enhancement in the Nuavg values of 3 Vol.% carbon nanofluid with nanosheets, nanorods and nanotubes are found to be 47.53, 26.86 and 26.85 per cent when compared with the value obtained for pure water. Practical implications The present results will be useful in choosing nanosheets-based nanofluid as the efficient heat transfer medium in cooling of high power electronic devices. Moreover, the obtained saturation point in the Strouhal number of the vibrating plate will help in cooling of turbine blades, as well as paper and textile drying. Moreover, the developed homogeneous heat transfer model can also be used to study different micro-convection phenomena in nanofluids by considering them as source terms in the momentum equation. Originality/value Impingement of jet over two different plate types such as stationary and vibrating is completely analyzed with the use of a validated in-house FVM code. A complete investigation on the influence of external magnetic field on the performance of plate type configuration is evaluated. The three fundamental shapes of carbon nanoparticles are also evaluated to obtain sphericity based hydrodynamic/heat transfer performance of jet impingement.

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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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Effect of uniform/non-uniform magnetic field and jet impingement on the hydrodynamic and heat transfer performance of nanofluids

Cited by 34 publications

References 44 publications

Jet Impingement Heat Transfer of Confined Single and Double Jets with Non-Newtonian Power Law Nanofluid under the Inclined Magnetic Field Effects for a Partly Curved Heated Wall

Jet Impingement Heat Transfer of Confined Single and Double Jets with Non-Newtonian Power Law Nanofluid under the Inclined Magnetic Field Effects for a Partly Curved Heated Wall

Effect of magnetic field and nanoparticle shape on jet impingement over stationary and vibrating plates

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

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