Turbulent heat transfer and nanofluid flow in a protruded ribbed square passage

In this study, the authors study the impact of spherical dimple surfaces and nanofluid coolants on heat transfer and pressure drop. The main objective of this paper is to evaluate the thermal performance of nanofluids with respect to different Reynolds numbers (Re) and nanoparticle compositions in dimpled channel flow. Water‐based nanofluids with Al 2 O 3, CuO, and Al 2 O 3–CuO nanoparticles are considered for this investigation with 1%, 2%, and 4% volume fraction for each nanofluid. The simulations are conducted at low Reynolds numbers varying from 500 to 1250, assuming constant and uniform heat flux. The effective properties of nanofluids are estimated using models proposed in the literature and are combined with the computational fluid dynamics solver ANSYS Fluent for the analysis. The results are discussed in terms of heat transfer coefficient, temperature distributions, pressure drop, Nusselt number, friction factors, and performance criterion for all the cases. For all cases of different nanoparticle compositions, the heat transfer coefficient was seen as 35%–46% higher for the dimpled channel in comparison with the smooth channel. Besides, it was observed that with increasing volume fraction, the values of heat transfer and pressure drop were increased. With a maximum of 25.18% increase in the thermal performance, the 1% Al 2 O 3/water was found to be the best performing nanofluid at Re = 500 in the dimpled channel flow.

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“…The governing equations are as follows 76 :

\nabla . (ρ . \vec{v}) = 0,

\nabla . (ρ . \vec{v} . \vec{v}) = - \nabla p + \nabla . (μ (][, (\nabla \vec{v} + \nabla {\overset{v}{true}}^{T}) - \frac{2}{3} \nabla . \overset{v}{true} I))) + ρ \overset{g}{true},

\nabla . (\vec{v} MathClass-open(ρ E + p MathClass-close)) = \nabla . (k_{e f f} \nabla T - h \overset{J}{true} + (μ (][, (\nabla \vec{v} + \nabla {\overset{v}{true}}^{T}) - \frac{2}{3} \nabla . \overset{v}{true} I) . \overset{v}{true})))) .

…”

Section: Mathematical Modelingmentioning

confidence: 99%

Numerical investigation of the thermo‐hydraulic performance of water‐based nanofluids in a dimpled channel flow using Al₂O₃, CuO, and hybrid Al₂O₃–CuO as nanoparticles

Ahmed¹,

Abir

Fuad³

et al. 2021

Heat Trans

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“…The heat transfer in multiple wings with solid rings TT inserts is better than the plain tube. The effectiveness of TT inserts is measured by using thermal hydraulic parameter η p [31,[33][34][35] in terms of TT Nu and f TT . In this investigation the value of these parameters for multiple wings with solid rings TT inserts is investigated and plotted in fig.…”

Section: Thermal Hydraulic Performancementioning

confidence: 99%

Fluid flow and heat transfer enhancement in wings with combined solid ring twisted tape inserts circular heat exchanger tube

Datt

Bhist

Kothiyal³

et al. 2019

THERM SCI

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Experimental examination is carried out to study the turbulent heat transfer and fluid-flow characteristics in circular heat exchanger tube using combined wing with solid ring twisted tape inserts. A series of experiments has been performed with the range of Reynolds number varied from 3000 to 21000, number of twisted taped inserts, N TT , varied from 1.0 to 4.0 with constant value of other twisted tape parameters such as rings pitch ratio, d R /D T = 1.0, wing pitch ratio, P W /W T = = 3.0, and wing depth ratio, W d /W T = 1.67. Based on the examined, turbulent heat transfer and fluid-flow in wing with combined solid ring twisted tape inserts results are compared with plain circular tube under same operating conditions. The experimental results show that the heat transfer is increased around 5.66 times than plane circular heat exchanger tube. The thermal and hydrodynamic performance parameter based on equal pumping power, η p , was found to be highest for N TT = 3.0. The optimum value of thermal and hydrodynamic performance has been found to be 2.74 for Reynolds mumber of 3000 within the range of the parameters investigated. Multiple wings with solid rings twisted tape inserts have been also shown to be thermally as well as hydraulically better in comparison to other similar twisted tape insert geometries.

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“…Keeping in mind the end goal to accomplish these requests, numerous generation strategies have been investigated over the years (Fang et al, 2016;Sarkar, 2011). The repeated rib surfaces are known for their effective enhancement of heat transfer, which is widely demanded in many scientific and industrial applications (Kumar et al, 2017a;Kumar et al, 2017b). Utilizing ribs on the internal surface of heat exchangers has been one of the normal in dynamic strategies to breakdown the laminar sub-layer and produce local wall turbulence because of stream partition and reattachment between consecutive corrugations, which directs the thermal resistance and expressively expands heat exchange (Duangthongsuk and Wongwises, 2009).…”

Section: Introductionmentioning

confidence: 99%

DEVELOPMENT OF NEW CORRELATIONS FOR NUSSELT NUMBER AND FRICTION FACTOR OF TiO_2/WATER BASED NANOFLUID FLOW IN V-PATTERN PROTRUSION RIBBED SQUARE CHANNEL

Kumar¹,

Singh²,

Maithani³

et al. 2018

Frontiers in Heat and Mass Transfer

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Nanofluids play important roles in the heat transfer and flow characteristics in ribbed square channels. Systematic experiments are conducted to measure heat transfer enhancement and TiO ଶ െ H ଶ O based nanofluid flow characteristics on a protruded with combined V-type ribbed square channel. Reynolds number studied in the channel range from 4000-18000. Investigational parameters of square channel contain, volume fraction range of 1.0-4.0%, particle diameter range of 30nm-45nm, relative protruded rib height range of 0.10-0.25, ratio of protruded height to print diameter range of 0.8-2.0, relative protruded rib pitch ratio range of 2.0-3.5 and angle of attack of 30 0 -75 0 respectively. Results indicates that the thermal performance of the protruded combined V-type ribbed square channel falls with increasing Reynolds number. The highest value of thermal hydraulic performance parameter is found to be 3.21for the range of parameters investigated. Correlations predicting Nusselt number and friction factor as a function of volume fraction, particle diameter range, relative protruded rib height, ratio of protruded height to print diameter, relative protruded rib pitch ratio, angle of attack and flow parameter. The correlations for Nusselt number and friction factor have also been developed on the basis of experimental data with considerable good accuracy.

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Turbulent heat transfer and nanofluid flow in a protruded ribbed square passage

Cited by 24 publications

References 27 publications

Numerical investigation of the thermo‐hydraulic performance of water‐based nanofluids in a dimpled channel flow using Al₂O₃, CuO, and hybrid Al₂O₃–CuO as nanoparticles

Numerical investigation of the thermo‐hydraulic performance of water‐based nanofluids in a dimpled channel flow using Al₂O₃, CuO, and hybrid Al₂O₃–CuO as nanoparticles

Fluid flow and heat transfer enhancement in wings with combined solid ring twisted tape inserts circular heat exchanger tube

DEVELOPMENT OF NEW CORRELATIONS FOR NUSSELT NUMBER AND FRICTION FACTOR OF TiO_2/WATER BASED NANOFLUID FLOW IN V-PATTERN PROTRUSION RIBBED SQUARE CHANNEL

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Turbulent heat transfer and nanofluid flow in a protruded ribbed square passage

Cited by 24 publications

References 27 publications

Numerical investigation of the thermo‐hydraulic performance of water‐based nanofluids in a dimpled channel flow using Al2O3, CuO, and hybrid Al2O3–CuO as nanoparticles

Numerical investigation of the thermo‐hydraulic performance of water‐based nanofluids in a dimpled channel flow using Al2O3, CuO, and hybrid Al2O3–CuO as nanoparticles

Fluid flow and heat transfer enhancement in wings with combined solid ring twisted tape inserts circular heat exchanger tube

DEVELOPMENT OF NEW CORRELATIONS FOR NUSSELT NUMBER AND FRICTION FACTOR OF TiO_2/WATER BASED NANOFLUID FLOW IN V-PATTERN PROTRUSION RIBBED SQUARE CHANNEL

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Numerical investigation of the thermo‐hydraulic performance of water‐based nanofluids in a dimpled channel flow using Al₂O₃, CuO, and hybrid Al₂O₃–CuO as nanoparticles

Numerical investigation of the thermo‐hydraulic performance of water‐based nanofluids in a dimpled channel flow using Al₂O₃, CuO, and hybrid Al₂O₃–CuO as nanoparticles