Numerical investigation of the thermal-hydraulic characteristics of turbulent flow in conical tubes with dimples

Kaood, Amr; Aboulmagd, Ahmed; Othman, Hesham; ElDegwy, Ahmed

doi:10.1016/j.csite.2022.102166

Cited by 31 publications

(7 citation statements)

References 43 publications

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“…It suggests a convergent tube HEX design offers energy efficiency and environmental benefits, potentially reducing CO2 emissions. Fluid-dimple interactions and flow distribution are related to performance enhancement [9,10]. Demonstrates that dimples can significantly improve heat transfer efficiency and conduction, with a 27% increase in thermal efficiency and a 29% increase in Alumina nanofluids and the impact of pulsing flow on heat transfer efficiency in a V-shaped corrugated channel.…”

Section: Introductionmentioning

confidence: 99%

Impact of Different Protrusions in Energy Transfer and Fluid Flow Characteristics Using Al₂O₃ Nanofluid in Pipe Flow

Gulshan Kumar

2024

jes

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The study investigates how the protruded surface (the part sticking out of an otherwise flat surface) over the small channel affects flow characteristics and heat transfer within a circular flow regime, utilizing computational methods. This investigation uses an alumina nanofluid to compare and analyze the thermo-physical parameters of protruding pipes such as boxes, cylinders, dimples, and pyramids in pipe flow. Alumina nanofluid with varying volume fractions was evaluated as a thermo-fluid under laminar flow conditions, exploring its ability to enhance energy transmission (heat) over the protruded channels. The protruded surface induces turbulence around the protruded region, altering the coolant's physical characteristics. Since heat transfer predominantly occurs on surfaces, the alteration in surface geometry due to the protruded shape increases detectable heat transfer and the Nusselt number. With an increase in the volume percentage of nanofluids, there's a tendency for pressure loss to rise along the flow direction's centerline. The dimpled channel exhibits the highest Nusselt number among all protruding channels, indicating that increasing the Reynolds number also increases the surface heat transfer coefficient for all protrusions. When compared to the base fluid, cylindrical protrusions show the greatest pressure drop. Additionally, comparing a protruded channel with base fluid to one with a 4% volume of alumina nanofluid, it can be observed that the latter significantly improves heat transfer, followed by volume fractions of 1% to 3%.

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Section: Introductionmentioning

confidence: 99%

Impact of Different Protrusions in Energy Transfer and Fluid Flow Characteristics Using Al₂O₃ Nanofluid in Pipe Flow

Gulshan Kumar

2024

jes

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“…Furthermore, it was found that d ¼ 7 mm, PL ¼ 30 mm and H ¼ 1.0 mm present the optimum performance regarding hydrothermal behavior. A study aimed to determine the performance of DT has been carried out by Kaood et al (2022) numerically. In their study, it has been examined that Re ¼ 3000-40000, constant heat flux of q 00 ¼ 40000 W/m 2 and H 2 O as HTF.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, it was found that d = 7 mm , PL = 30 mm and H = 1.0 mm present the optimum performance regarding hydrothermal behavior. A study aimed to determine the performance of DT has been carried out by Kaood et al. (2022) numerically.…”

Section: Introductionmentioning

confidence: 99%

Investigation of magneto-convection characteristics in a sudden expanding channel with convex surface geometry under thermally developing flow conditions

Gürsoy,

Pazarlioğlu,

Gürdal

et al. 2024

HFF

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Purpose The purpose of this study is to analyse the magnetic field effect on Fe3O4/H2O Ferrofluid flowing in a sudden expansion tube, which has specific behaviour in terms of rheology, with convex dimple fins. Because the investigation of flow separation is a prominent application in performance, the effect of magnetic field and convex dimple on the thermo-hydraulic performance of sudden expansion tube are examined, in detail. Design/methodology/approach During the solution of the boundary conditions of the sudden expansion tube, finite volume method was used. Analyses have been conducted considering the single-phase solution, steady-state, incompressible fluid and no-slip condition of the wall under forced convection conditions. In the analyses, it has been assumed that the flow was developing thermally and has been fully developed hydrodynamically. Findings The present study focuses on exploring the influence of the magnetic field, nanofluid concentration and convex dimple fins on the thermo-hydraulic performance of sudden expansion tube. The results indicate that the strength of the magnetic field, nanofluid concentration and convex dimple fins have a positive effect on the convective heat transfer in the system. Originality/value The authors conducted numerical studies, determining through a literature search that no one had yet investigated enhancing heat transfer on a sudden expansion tube using combinations of magnetic fields, nanofluids and convex dimple fins. The results of the numerical analyses provide valuable information about the improvement of heat transfer and system performance in electronic device cooling and heat exchangers.

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“…Furthermore, it was found that d=7 mm, PL=30 mm, and H=1.0 mm present the optimum performance regarding hydrothermal behavior. A study aimed to determine the performance of DT has been carried out by Kaood et al [11]. The numerical study has been examined under Re=3000-40000, constant heat flux of q"=40000 W/m 2 and using H2O as HTF.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Magneto-Convection Characteristics in A Sudden Expanding Channel with Convex Surface Geometry Under Thermally Developing Flow Conditions

Gürsoy,

Pazarlıoğlu,

Gürdal

et al. 2023

Preprint

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The current study presents a novelty with focusing on the magnetic field effect on a sudden expansion tube with expansion ratio, total length, and pitch length of the dimpled fin is 2.5, 1500 mm, and 3.0, respectively. The magnetizable Fe3O4/H2O Ferrofluid with different nanoparticle volumetric concentrations (φ = 1.0% and 2.0%) were used as a heat transfer fluid, and magnetohydrodynamic effects were elaborately investigated in this study. The numerical analysis was conducted under laminar flow regime and the DC magnetic field (B0 = 0.03T, 0.05T, 0.3T, and 0.5T). The present study provided a comprehensive investigation, which presented the thermo-hydraulic performance of difference dimpled fins, Fe3O4/H2O Ferrofluid, and magnetic field. According to the results, dimple fins showed the best increment within heat transfer enhancement techniques. The heat transfer enhancement rate of the dimple tube and Fe3O4/H2O Ferrofluid were respectively acquired as 22.62% and 5.43%-6.28% (φ = 1.0% and 2.0%). When dimpled fin and Fe3O4/H2O Ferrofluid were used, the increment in Performance Evaluation Criteria was calculated as 21.31% and 4.85%-9.79% (φ = 1.0% and 2.0%). Although the highest average Nusselt number was obtained at B0 = 0.5T, the highest performance evaluation criteria were detected at B0 = 0.3T due to the friction factor showing an increment.

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Numerical investigation of the thermal-hydraulic characteristics of turbulent flow in conical tubes with dimples

Cited by 31 publications

References 43 publications

Impact of Different Protrusions in Energy Transfer and Fluid Flow Characteristics Using Al₂O₃ Nanofluid in Pipe Flow

Impact of Different Protrusions in Energy Transfer and Fluid Flow Characteristics Using Al₂O₃ Nanofluid in Pipe Flow

Investigation of magneto-convection characteristics in a sudden expanding channel with convex surface geometry under thermally developing flow conditions

Investigation of Magneto-Convection Characteristics in A Sudden Expanding Channel with Convex Surface Geometry Under Thermally Developing Flow Conditions

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