Thermal effects of nonuniform heating in a nanofluid‐filled annulus: Buoyant transport versus entropy generation

Sankar, M.; Swamy, H. A. Kumara; Do, Younghae; Altmeyer, Sebastian

doi:10.1002/htj.22342

Cited by 28 publications

(8 citation statements)

References 50 publications

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“…One such application was demonstrated by Colangelo et al [13], who studied the application of aluminium oxide in solar collectors to understand the potential heat transfer improvement with increasing nanoparticle concentration. Aluminium oxide was also studied by Sankar et al [14], where the researchers studied the effects of non-uniform heating of nanoparticlefilled water in terms of understanding the buoyant transport and entropy generation for heat transfer applications. Pushpa et al [15] studied the effects of convective heat transfer with copper nanoparticles in water with a thermally conductive fin and found that higher nanoparticle concentration improved heat transport rate with sensitivity to fin length and location.…”

Section: Introductionmentioning

confidence: 99%

Investigation of heat transfer performance within annular geometries with swirl-inducing fins using clove-treated graphene nanoplatelet colloidal suspension

Nair

Oon

Tan

et al. 2022

J Therm Anal Calorim

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The paper investigated the benefits of having fins that induce swirling flow within an annular passage. The importance of the vortical structures produced using different fin angles and flow velocities in heat transfer was studied. The combination of swirling fluid with recirculation on heat transfer within an annular domain was not fully understood, and this paper aims to address that gap. The 10°, 20°, 30° and 40° angled fins were investigated to understand the changes in heat transfer performance as fluid recirculation becomes more dominant as angles become steeper. The usage of CGNP colloidal suspension was investigated for its potential benefits in heat transfer in a domain with angled fins. The CGNP concentrations of 0.025, 0.075 and 0.1 mass % were used as part of this investigation. Higher concentrations of CGNP increased the overall heat transfer coefficient. A more compact fin spacing improved heat transfer performance at the expense of increased pressure drop. Fin angles of 20° and 30° yielded poor heat transfer performance in the transitional flow regime (2000 < Re < 3000) due to the smaller swirling longitudinal vortices being insufficient in promoting fluid mixing from the thermal boundary layer into the freestream.

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Section: Introductionmentioning

confidence: 99%

Investigation of heat transfer performance within annular geometries with swirl-inducing fins using clove-treated graphene nanoplatelet colloidal suspension

Nair

Oon

Tan

et al. 2022

J Therm Anal Calorim

View full text Add to dashboard Cite

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“…[11] revealed that an optimal mix of nanoparticles is another essential feature in increasing thermal transfer in an annular geometry comprising nanoliquids with variably heated borders. According to [12], adding nanoparticles to the base fluid reduces the strength of fluid flow and the rate of heat transmission. Due to the incorporation of nanoparticles in the host fluid of water, [13] discovered that shallow annular enclosures provide higher thermal performance with little entropy formation.…”

Section: Background Informationmentioning

confidence: 99%

Effects of Branched Fins on Alumina and N-Octadecane Melting Performance Inside Energy Storage System

et al. 2022

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The importance of Phase change material (PCM) energy storage systems is no longer new in the industry. However, the influence of using branched fins inside the energy storage system on the melting process of alumina nanoparticles and n-octadecane has not been reported in the literature. Consequently, the outcome of a study on the numerical simulation for optimizing the melting performance of a PCM in various tubes, including those with branching fins is presented in this report. Four examples were assessed in relation to a suspension of alumina nanoparticles and n-octadecane paraffin that contains heated fins. A numerical technique based on the Galerkin finite element method (GFEM) was used to solve the dimensionless governing system. The average liquid percentage over the flow zone in question was computed. The primary results indicated that altering the number of heated fins might affect the flow structures, the system’s irreversibility, and the melting process. Case four, with eight heated fins, likewise produces the greatest average liquid fraction values and completes the melting process in 850s. Additionally, when 6% nano-enhanced PCM was used instead of pure PCM, the melting process is accelerated by 28.57 percent.

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“…Batool et al [7] also considered the nanofluid in their investigation of fluid flow through the lid-driven cavity with the aim to improve the heat transfer process. Recently, Sankar et al [8] explored the alumina-water nanofluid flow inside the vertical annular geometry with non-uniform heating. The augmentation of thermal transfer is facilitated through the addition of nanoparticles, but this also causes the flow strength to reduce [8].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Sankar et al [8] explored the alumina-water nanofluid flow inside the vertical annular geometry with non-uniform heating. The augmentation of thermal transfer is facilitated through the addition of nanoparticles, but this also causes the flow strength to reduce [8]. However, despite the continuous investigations, the thermal performance of nanofluids is still limited and this then results towards the formation of hybrid nanofluid.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Nanofluid Radiative Mixed Convection Stagnation Point Flow Past a Vertical Flat Plate with Dufour and Soret Effects

et al. 2022

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The widespread application of hybrid nanofluid in real applications has been accompanied by a large increase in computational and experimental research. Due to the unique characteristics of hybrid nanofluid, this study aspires to examine the steady two-dimensional mixed convection stagnation point flow of a hybrid nanofluid past a vertical plate with radiation, Dufour, and Soret effects, numerically. The formulations of the specific flow model are presented in this study. The model of fluid flow that is expressed in the form of partial differential equations is simplified into ordinary differential equations via the transformation of similarity, and then solved numerically by using the boundary value problem solver known as bvp4c in MATLAB, which implements the finite difference scheme with the Lobatto IIIa formula. Two possible numerical solutions can be executed, but only the first solution is stable and meaningful from a physical perspective when being evaluated via a stability analysis. According to the findings, it is sufficient to prevent the boundary layer separation by using 2% copper nanoparticles and considering the lesser amount of Dufour and Soret effects. The heat transfer rate was effectively upgraded by minimizing the volume fraction of copper and diminishing the Dufour effect. Stronger mixed convection would lead to maximum skin friction, mass transfer, and heat transfer rates. This important preliminary research will give engineers and scientists the insight to properly control the flow of fluids in optimizing the related complicated systems.

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Thermal effects of nonuniform heating in a nanofluid‐filled annulus: Buoyant transport versus entropy generation

Abstract: The primary challenge in the majority of heat transfer applications, in view of design perspective, is to maximize the thermal transport with the minimum generation of entropy. This paper addresses the numerical Heat Transfer.

Cited by 28 publications

References 50 publications

Investigation of heat transfer performance within annular geometries with swirl-inducing fins using clove-treated graphene nanoplatelet colloidal suspension

Investigation of heat transfer performance within annular geometries with swirl-inducing fins using clove-treated graphene nanoplatelet colloidal suspension

Effects of Branched Fins on Alumina and N-Octadecane Melting Performance Inside Energy Storage System

Hybrid Nanofluid Radiative Mixed Convection Stagnation Point Flow Past a Vertical Flat Plate with Dufour and Soret Effects

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