Turbulent heat transfer and fluid flow of alumina nanofluid inside three-lobed twisted tube

Omidi, Mohamad; Darzi, A. Ali Rabienataj; Farhadi, Mousa

doi:10.1007/s10973-019-08026-w

Cited by 33 publications

(10 citation statements)

References 46 publications

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“…The numerical system is modeled in 3D steady-state with RNG k-ɛ turbulence model is chosen for computational solutions. The equations of k-ɛ is associated with this turbulence model are given as follows [24]:…”

Section: Meshing Flow Domain and Grid Generation Independence Testmentioning

confidence: 99%

Flow Field Structure, Characteristics of Thermo-Hydraulic and Heat Transfer Performance Analysis in a Three Dimensions Circular Tube with Different Ball Turbulators Configurations

Al‐Obaidi

Chaer

2021

Arab J Sci Eng

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This paper presents the findings from a research study using computational fluid dynamics (CFD) on the impact of different diameter Ball Tabulators Inserts (BTI) on the three-dimensional flow pattern and heat transfer characteristics within a circular tube. This analysis was carried under uniform heat flux conditions with different BTI diameters (1, 2, 3, 4, 5, 6, 7, and 8 mm). Fluid flow, pressure drop, dynamic pressure, velocity components, thermo-hydraulic, turbulent kinetic energy, and turbulent viscosity were analysed qualitatively and quantitatively. The performance evaluation results revealed that the characteristics of flow behaviour and the velocity field contours variations are closely associated to the BTI configurations. Also, the computational results indicated that the change in fluid flow velocity near the pipe wall and around the BTI are important parameters for the heat transfer enhancement as compared to that obtained without BTI under the same conditions. Moreover, using BTI presented a distinguished influence on the rate of heat transfer. Additionally, vortex flow through means of this kind of BTI is an important parameter in the enhancement of heat transfer. The use of BTI can enhance the rate of heat transfer performance by more than 46 %. Furthermore, the maximum value for the PEF is found to be more than 1.03.

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Section: Meshing Flow Domain and Grid Generation Independence Testmentioning

confidence: 99%

Flow Field Structure, Characteristics of Thermo-Hydraulic and Heat Transfer Performance Analysis in a Three Dimensions Circular Tube with Different Ball Turbulators Configurations

Al‐Obaidi

Chaer

2021

Arab J Sci Eng

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“…Most of the researchers worked on ANSYS FLUENT for CFD analysis. Hae et.al [4], Mohan et.al [5], Seyed et.al [6], Mohamad Omidi et.al [7] worked on short helical fins, different pitches, nano fluids along with experimental, numerical, cfd simulations and empirical studies. The vast literature leads to the present investigation for the performance enhancement of DPHE with Autodesk Commercial CFD software with theoretical analysis.…”

Section: Literature Surveymentioning

confidence: 99%

Performance Enhancement of Double Pipe Heat Exchanger with Helical Fin and Vortex Generator using CFD

Talakonda,

Jayachandraiah,

Reddy

2019

IJEAT

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Transferring heat from one fluid to another fluid without losing of major energy is a challenging task in the food processing and other industries. Double Pipe Heat Exchanger (DPHE) are light capacity Heat Exchangers (HE) used for air and other gas applications. In the present work an attempt is made to enhance the heat transfer of DPHE with helical fins and vortex generator. The working fluids are air and steam (water vapour) along outer and inner pipes. The parameters considered are helix angles, i.e. 350 , 400 , & 450 and pitch size i.e. 80 mm, 75 mm and 70 mm, and a vertex generator. CATIA V5 and Autodesk CFD are used for modelling and analysis. It is found that 400 angle helix fin 70 mm pitch along Delta Wing type (Triangular) vortex generator (VG) gives best performance

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“…A numerical analysis of vortex generators (VG), placed on the tubes of an exchanger, was carried out by J. Jang et al The results obtained showed that the optimal values of the angle of inclination (θ) and the transverse location (Ly), are respectively between: 30° < θ < 60° and 2 mm < Ly < 20 mm. Omidi et al (2019) numerically investigated the effect of alumina nanofluid inside a three-lobe twisted ribbon tube on heat exchanger performance for various volume fractions of nanofluid from 0 .01, 0.02 and 0.03 with a Reynolds number between 5000 and 20,000; they noticed that increasing the nanoparticle concentration improves the heat transfer rates for these cases, while it does not increase the relative Nusselt number inside the twist tube with a Y-insert at a Reynolds number and high nanoparticle concentration. Shobahana et al (2018) concluded that the overall performance of the double fin and tube heat exchanger can be improved by 27-91% using 20 degree RWVGs for the studied Reynolds number range.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of a Tubular Heat Exchanger Fitted with Triangular Ribs

BENAMARA¹,

LAHMER²,

MERZOUG³

et al. 2022

EPSTEM

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Turbulent heat transfer and fluid flow of alumina nanofluid inside three-lobed twisted tube

Cited by 33 publications

References 46 publications

Flow Field Structure, Characteristics of Thermo-Hydraulic and Heat Transfer Performance Analysis in a Three Dimensions Circular Tube with Different Ball Turbulators Configurations

Flow Field Structure, Characteristics of Thermo-Hydraulic and Heat Transfer Performance Analysis in a Three Dimensions Circular Tube with Different Ball Turbulators Configurations

Performance Enhancement of Double Pipe Heat Exchanger with Helical Fin and Vortex Generator using CFD

Numerical Investigation of a Tubular Heat Exchanger Fitted with Triangular Ribs

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