Numerical Investigation of Natural Convection Heat Transferfrom Square Cylinder in an Enclosed Enclosure Filled with Nanofluids

Alí, Omar; Kahwaji, Ghalib Y.

doi:10.14810/ijmech.2015.4401

Cited by 12 publications

(2 citation statements)

References 8 publications

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“…This again implies that convection plays a dominant role in transferring heat. This corroborates and consistent with the findings of [15,16]. This is not surprising, Fig.…”

Section: Resultssupporting

confidence: 93%

“…5 shows an increase in the average Nusselt number with the Rayleigh number which implies that the intensity of convective heat transfer grows with Rayleigh number. This conforms to the findings of [4,6,15,17]. Although the authors only considered single tube, the increase in the gradient of the lines at Rayleigh number of 10 5 indicates enhancement of heat transfer due to convection over conduction at higher values of Ra.…”

Section: Engineeringsupporting

confidence: 90%

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Modeling of natural convection of a concentrated solar power receiver absorber tube in interaction with neighbouring absorbers

2021

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Concentrated Solar Power (CSP) technology stands out among other renewable energy sources not only because of its ability to address current energy security and environmental challenges but because its energy can be stored for future use. To ensure optimum performance in this system, the heat losses need to be evaluated for better design. This work studies the natural convection in the receiver absorber tube of a CSP plant taking into consideration the influence of neighboring absorbers. A 2-Dimensional model was adopted in this study. Initially, a single absorber tube was considered, it was subjected to heat flux at the top wall, the bottom wall was insulated and a temperature differential was set up at the lateral walls. The dimensionless forms of Navier-Stokes and energy equations were solved using the finite element formulation of COMSOL Multiphysics software. The result obtained for a single absorber tube showed good agreement with existing research works. This validated model was then extended to multiple absorber tubes (two to six absorber tubes). On the basis of the study, there is an observed increase in the intensity and dominance of convective heat transfer with an increase in the number of absorber tubes. This is occasioned by an increase in the average surface temperature as well as average Nusselt number. For the Rayleigh number of 104, 105 and 106, the average Nusselt number increases with the number of absorber tubes by 13.87 %, 6.26 %, and 1.55 %, respectively. This increment suggests effect of thermal interactions among the neighboring absorber tubes

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“…This again implies that convection plays a dominant role in transferring heat. This corroborates and consistent with the findings of [15,16]. This is not surprising, Fig.…”

Section: Resultssupporting

confidence: 93%

Section: Engineeringsupporting

confidence: 90%

Modeling of natural convection of a concentrated solar power receiver absorber tube in interaction with neighbouring absorbers

2021

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Numerical study for nanopowder transportation owing to Lorentz force

Rothan

2022

Z Angew Math Mech

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Adding additive with nano‐sized and considering porous media, new container has been generated and numerical technique was employed to model the convection process of cooling the four lobed surfaces which is situated inside three lobed tanks. Uniform flux was considered for four lobed surfaces while the outer surface is cold wall. With neglecting advection term due to employ of Darcy law, simpler form of momentum equations was appeared with is coupled with source term of magnetic field. Moreover, mixture model for testing fluid was applied with incorporating the efficacy of shape of nanopowders. Dispersing nanoparticles causes augmentation in Nu around 41.33% because of augmenting conductivity. The elevation of Ra makes Nu to increase around 38.98% in absence of Ha while this augmentation reaches to 1.54% in existence of Ha which means that domination of conduction in appearance of MHD. Augmenting shape parameter leads to rise of Nu around 11.72% while increment of Ha causes this function to reduce around 11.73%.

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Investigation of thermal treatment of hybrid nanoparticles in a domain with different permeabilities

Zuo¹,

Salahshoor

Yadav

et al. 2020

J Therm Anal Calorim

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Numerical Investigation of Natural Convection Heat Transferfrom Square Cylinder in an Enclosed Enclosure Filled with Nanofluids

Abstract: ABSTRACT

Cited by 12 publications

References 8 publications

Modeling of natural convection of a concentrated solar power receiver absorber tube in interaction with neighbouring absorbers

Modeling of natural convection of a concentrated solar power receiver absorber tube in interaction with neighbouring absorbers

Numerical study for nanopowder transportation owing to Lorentz force

Investigation of thermal treatment of hybrid nanoparticles in a domain with different permeabilities

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