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

Ahmed, Farid; Abir, Atrehar; Fuad, M. Y. Ahmad; Akter, Farhana; Bhowmik, Palash K.; Alam, Syed Bahauddin; Kumar, Dinesh

doi:10.1002/htj.22116

Cited by 21 publications

(9 citation statements)

References 77 publications

(101 reference statements)

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“…This allows us to conclude that the addition of nanoparticles in the fluid base increases the pressure drop across the elbow. The behavior has been observed by a previous numerical study 43 …”

Section: Resultssupporting

confidence: 74%

Turbulent forced convection and entropy analysis of a nanofluid through a 3D 90° elbow using a two‐phase approach

Korei

Benissaad

2021

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In a scenario characterized by a secondary flow called Dean's vortices, thermal and flow behavior analysis is examined. Forced convection of an Al2O3–water nanofluid through a three‐dimensional (3D) 90° elbow was analyzed numerically using a multiphase mixture model. Turbulence is taken into account by using the shear‐stress transport k–ω model. Also, entropy production is presented to obtain the optimized conditions. Simulation parameters consist of different Reynolds numbers (10,000 ≤ italicRe ≤ 100,000), nanoparticle volume fraction false( 2 % ≤ ϕ ≤ 6 % false), nanoparticle diameter ( 10 ≤ d p ≤ 40 ). The findings reveal that the increase in the ϕ and the Re along with a smaller dp discourages the appearance of Dean vortices in the flow. The pressure drop increases with the increase in the volume fraction and the decrease in the nanoparticles' diameter. The highest NuM is observed at ϕ = 6 % for d p = 10 nm. Significant heat transfer rates are observed near the outer wall. The minimum total entropy production is obtained at Re = 100,000 for ϕ = 2 % and d p = 40 nm.

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Section: Resultssupporting

confidence: 74%

Turbulent forced convection and entropy analysis of a nanofluid through a 3D 90° elbow using a two‐phase approach

Korei

Benissaad

2021

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“…Al-Obaidi et al 28 numerically examined the pressure drop and heat transfer within circular pipes of different configurations by using a FLUENT CFD solver. A similar study was published by Ahmed et al 29 on the impact of dimpled channels filled with nanofluids on heat transfer thermal performance. Their results showed that dimpled channels produced higher heat transfer coefficients of around (35%-46%) than the smooth channel.…”

Section: Introductionsupporting

confidence: 66%

Experimental and numerical study on the heat transfer enhancement over scalene and curved‐side triangular ribs

et al. 2023

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The present study examines the turbulent flow of mixed convection heat transfer enhancement within a rectangular channel considering three different novel shapes of ribs (smooth, scalene, and curved‐side triangular). The investigations were conducted experimentally by developing a new test facility, while the numerical computations were carried out using the finite volume method. The experimental work involves constructing of the channel, ribs, and all equipment and measurement instruments. The numerical work is based on ANSYS FLUENT considering the k–ε turbulent model. The results are presented and compared in terms of Nusselt number, friction factor, and performance factors for Reynolds numbers ranging between 3000 and 12,000. By comparing the average values of the numerically obtained Nusselt number with experimental measurements, the data showed a close agreement with a maximum difference of 5%. It also found that scalene triangular ribs (STRs) provide better performance in terms of heat transfer, although introducing a slight increase in friction losses. STRs showed (20%) increase in Nusselt number compared with smooth channel, and 3%–6% increase in Nusselt number compared with curved‐side triangular ribs (CTRs). In contrast, CTRs have a lower friction factor value of 5% compared with STRs at a low value of a Reynolds number of 3000. Furthermore, the Nusselt number changes significantly (250% increase) by increasing the value of the Reynolds number from 3000 to 12,000. A thermal performance factor of up to 1.28 was achieved for the STRs at the lowest range of Reynolds' number of 3000. The findings from the present study are of practical importance for industries requiring heat transfer enhancement techniques to improve heat transfer equipment performance.

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“…Viscosity of nanofluid is 13,14,17,21,22,24 To predict the streamline curvature near the wall, the renormalization group (RNG), the k-ε model is taken up. The governing equations for part of continuity, part of the momentum, and part of energy conservation, k and ε model is articulated as follows:…”

Section: Characterization Of Nanofluidsmentioning

confidence: 99%

“…The specific heat of a nanofluid 13,14,17,21,22,24

{false(C_{p} false)}_{n f} = \frac{(1 - ϕ) {false(ρ C_{p} false)}_{f} + ϕ {false(ρ C_{p} false)}_{n p}}{ρ_{n f}} .

…”

Section: Introductionmentioning

confidence: 99%

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Use of segmental baffle in shell and tube heat exchanger for nano emulsions

Gugulothu

Sanke

2022

Heat Trans

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Among the heat exchangers (HE), the shell and tube type is being widely used in different applications like oil, chemical, and power plant Industries. The incorporation of segmental baffles (SB) improves the HE capacity from higher temperature fluid to lower temperature fluid. Nanofluids can be effectively used to enhance the heat transfer rate. In this study, numerical simulations have been carried out in a shell and tube heat exchanger (STHX). Among HE design methods, Tubular Exchanger Manufacturers Association (TEMA) standard is being used for better design by many researchers. In this paper, the computational fluid dynamics analysis was carried out with Al2O3, CuO, and SiO2 nanofluids amid 1, 3, and 5 vol. % with water emulsion to enhance the heat transfer coefficient of STHX. The nanofluid has been used in the cold fluid of the HE and on the other side hot water is used. From the results, it is noticed that with the increase of Nanofluids, the value of heat transfer coefficients is found to be increasing. The overall heat transfer coefficient has been enhanced for Al2O3, CuO, and SiO2 about 10.41%, 12.27%, and 9.56%, respectively, at 0.22 kg/s for the 5 vol. % addition. It is also depicted that the pressure drop is increasing with the incorporation of nanofluids.

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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

Cited by 21 publications

References 77 publications

Turbulent forced convection and entropy analysis of a nanofluid through a 3D 90° elbow using a two‐phase approach

Turbulent forced convection and entropy analysis of a nanofluid through a 3D 90° elbow using a two‐phase approach

Experimental and numerical study on the heat transfer enhancement over scalene and curved‐side triangular ribs

Use of segmental baffle in shell and tube heat exchanger for nano emulsions

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