MHD natural convective Ag-water nanofluid flow in an enclosure having internal heat generation with centre heater and bottom heat source

Nithyadevi, N.; Mahalakshmi, Thangavelu; Shankar, C. Udhaya

doi:10.1504/ijnp.2017.089449

Cited by 12 publications

(4 citation statements)

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“…The outcomes showed that Nu enhances with rising in length of heater and diminishes with rising in magnetic field. Nithyadevi et al 25 investigated the impacts of involving ag/water to a porous medium under natural convective. The findings displayed that further progress in solid fraction guides extreme progress in Nu .…”

Section: Introductionmentioning

confidence: 99%

Conjugate local thermal nonequilibrium and non‐Darcy flow inside porous enclosure: Analysis of localized heating and cooling arrangements

Basher

Yousif

2023

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This study covers a simulation on conjugate free convective in a porous enclosure containing a side wall thickness and partially heated and cooled from sides under the considerations of local thermal nonequilibrium (LTNE) and non‐Darcy flow. Interest has been focused on how the side wall thickness and the locations of cooled and heated parts affect the effectiveness of the Nusselt number (Nu). Three different cases of localized heating and cooling locations have been implemented for the following ranges: scaled heat transfer coefficient (), wall to fluid thermal conductivity ratio (), modified Rayleigh number (), wall width (), inertial parameter (), and thermal conductivity ratio (). Outcomes show that and the locations of cooled and heated parts have remarkable impacts on all the Nusselt numbers. The intensity of LTNE region considerably relies on , and . The total average NuT is highly dependent on , , , , and as compared to H. The increase in leads to change of the convective mechanism to conductive mode. The rise in guides to increase Nu, where can control the flow strength. The actions of on Nuf is more evident than Nus. For low H and Kr, the size of LTNE zone is considerably affected by H as compared to Kr although Kr has a high influence on Nu. For high Kr and H, the LTNE zone has closely vanished. Findings display that the Case 2 provided the highest Nu for all tested parameters except the case of . Finally, it is evident that for the problems that employed solid conduction wall with localized heating and cooling sections, Case 2 is recommended for future use in the applications that implement a porous medium and depend on free convection.

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Section: Introductionmentioning

confidence: 99%

Conjugate local thermal nonequilibrium and non‐Darcy flow inside porous enclosure: Analysis of localized heating and cooling arrangements

Basher

Yousif

2023

Heat Trans

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“…Other researchers have conducted several numerical studies on free convection, comprising either horizontal/vertical heated surface or block‐body located inside enclosure filled with porous medium under LTNE condition to distinguish the influences of using several types of boundary conditions, nanofluids, magnetic field, and radiation on Nusselt number 28‐37 . Nazari et al 28 carried out a numerical study on natural convection from vertical surface immersed in porous layer using Darcy flow to analyze the impact of LTNE model.…”

Section: Introductionmentioning

confidence: 99%

“…The solutions displayed that the Nusselt number has been enhanced with the raise in heater length and reduced with the raise in magnetic field. Then, Nithyadevi et al 32 presented a numerical study on free convection induced inside duct filled by porous medium and heated from bottom to analyze the influence of adding Ag‐water nanofluid to porous medium. The solutions show that the increase in solid fraction of nanofluid leads to a substantial enhancement in Nusselt number.…”

Section: Introductionmentioning

confidence: 99%

A thermal nonequilibrium model to natural convection inside non‐Darcy porous layer surrounded by horizontal heated plates with periodic boundary temperatures

2021

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This article displays a numerical investigation on natural convection within non‐Darcy porous layer surrounded by two horizontal surfaces having sinusoidal temperature profiles with difference in phase and wave number. The Darcy–Brinkman–Forchheimer model and local thermal nonequilibrium condition have been employed. Simulations have been performed for wide ranges of inertia coefficient (10–4 ≤ Fs/Pr* ≤ 10–2), thermal conductivity ratio (0.1 ≤ K r ≤ 100), phase difference (0 ≤ β ≤ π), modified Rayleigh number (200 ≤ Ra* ≤ 1000), wavelength (3 ≤ k ≤ 12), and nondimensional heat transfer coefficient (0.1 ≤ H ≤ 100). Results demonstrate that Nusselt number highly relies on Fs/Pr*, K r, β, Ra*, and k as compared to H. A considerable enhancement in fluid, solid, and overall Nusselt numbers has been observed with diminishing Fs/Pr* and β and increasing k, K r, and H. The raising in β has a significant impact on Nu for smaller k and this effect is almost ignored when k > 12. The increase in Ra*, K r, β, and H and decrease in Fs/Pr* and k acts to reduce the severity of nonequilibrium zone and increase the size of thermal equilibrium zone. The influence of H on nonequilibrium area is more evident than K r.

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“…The findings displayed that the Nusselt number highly depends on the Hartmann number when the Rayleigh number is increased. Later, Nithyadevi et al 29 presented a numerical study on magnetohydrodynamics (MHD) free convective inside duct heated from below and cooled from sides, where the duct having a heater in the center and filled by Ag-water. The findings indicated that the peak Nusselt number was found when the heater was inserted in a vertical way.…”

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confidence: 99%

Free convective heat transfer induced inside a vented duct having two aligned hot and cold cylinders: An experimental study

Alomar,

Ali,

Al‐Omar

2024

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Free convective heat transfer created from two aligned cylinders immersed inside a vented air duct is experimentally investigated. The experiments include the measurements of cylinders temperature and the air temperature inside the enclosure under steady, turbulent, and incompressible flow properties by using steady‐state heat equations. The studied parameters include Rayleigh number (), opening sizes at lower and upper enclosure surfaces (), and space size between cylinders () with the constant ratio of enclosure width to cylinder diameter equal to 6. The findings displayed that the average air temperature inside the enclosure for the low values of S and O is low, and it rises as S is raised. The behaviors of Nu differ with changing Ra values. An interaction between hot cylinder and cold cylinder inside the enclosure is observed that depends on O and S values, and hence, they have a large impact on fluid temperature. The data indicated that rises with the for all and values. The value of for each cylinder depends on the values of and . The maximum value has been obtained when and with maximum enhancement between 30% and 50% depending on Ra values as compared with and , whereas the minimum average has been indicated when and . The profiles of reveal that , , and have a considerable influence on heat transfer.

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MHD natural convective Ag-water nanofluid flow in an enclosure having internal heat generation with centre heater and bottom heat source

Cited by 12 publications

References 0 publications

Conjugate local thermal nonequilibrium and non‐Darcy flow inside porous enclosure: Analysis of localized heating and cooling arrangements

Conjugate local thermal nonequilibrium and non‐Darcy flow inside porous enclosure: Analysis of localized heating and cooling arrangements

A thermal nonequilibrium model to natural convection inside non‐Darcy porous layer surrounded by horizontal heated plates with periodic boundary temperatures

Free convective heat transfer induced inside a vented duct having two aligned hot and cold cylinders: An experimental study

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