Numerical investigation of heat transfer and pressure drop of in-line array of heated obstacles cooled by jet impingement in cross-flow

Maghrabie, Hussein M.; Attalla, M.; Fawaz, H.E.; Khalil, Mohamed

doi:10.1016/j.aej.2016.12.022

Cited by 28 publications

(9 citation statements)

References 18 publications

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“…The hydraulic diameter of the channel was calculated using Eq. ( 10) (Mergen 2014, Örs 2017, Maghrabie et al 2017, Incropera et al 2007, where Ac is the cross-sectional area of the channel, Pc is the wetted perimeter of the cross-section of the channel, H is the channel height, and W is the channel width.…”

Section: Channel Hydraulic Diametermentioning

confidence: 99%

Analysis of Thermal and Flow Characteristics in a Combined Cross-Flow and Jet-Flow Configuration with Flow-Guiding Fins

2022

JAFM

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This study investigated the enhanced cooling of electronic components at high temperatures with cross-flow and jet-flow combinations. The cooling performance of four different model geometries (Models 1, 2, 3, and 4) of an electronic component was analysed by considering different jet-to-channel inlet velocity ratios (Vj/Vc) and ratios of the distance between the jet and impinging surface to jet diameter (H/D). The Vj/Vc and H/D ratios were varied in the 0-3 and 2-4 ranges, respectively, in the computational fluid dynamics analysis. The thermal and flow characteristics were revealed through a comparative result analysis, also considering results from the literature. The heat transfer improved, the Nusselt number increased, and the electronic surface temperature decreased with an increase in the Vj/Vc ratio. However, the Nusselt number decreased with an increase in the H/D ratio. Models 2 and 4 had higher heat transfer from the electronic component than the other models. A low H/D ratio and low Vj/Vc ratio yielded higher heat transfer in Model 3 than in Model 1.

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Section: Channel Hydraulic Diametermentioning

confidence: 99%

Analysis of Thermal and Flow Characteristics in a Combined Cross-Flow and Jet-Flow Configuration with Flow-Guiding Fins

2022

JAFM

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“…It was discovered that a change in the position of the jet to the channel inlet could boost the heat transfer rate. The computational search resulting from the jet impingement with the cross-flow for cooling a set of hot components was analyzed by Maghrabie et al 31 The study revealed that the rise in the Re ratio enhances Nutrue¯. To minimize the temperature of electronic systems, Zunaid et al 32 studied the thermal efficiency of a set of inclined microjets.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigations of heat transfer around a hot block subject to a cross-flow and an extended jet hole using ternary hybrid nanofluids

Boudraa

Bessaïh

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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In the last few years, modern heat transfer technologies significantly improved to provide more efficient systems in industries. One of those technologies is cooling electronic components in laminar flow using water nanofluids, which is interesting. This research used a ternary hybrid nanofluid with various nanoparticle forms to conduct a numerical investigation of three-dimensional heat transfer and fluid flow over a heated block exposed to a horizontal flow and an impinging jet. The effects of several variables such as the Reynolds number ratio [Formula: see text], volume fraction of nanoparticles [Formula: see text], length of extended jet hole [Formula: see text], and the influence of the inclination angle of the impinging jet inlet [Formula: see text] on the fluid flow and heat transfer were examined. Using the Ansys-Fluent 14.5 program and under laminar flow conditions, the finite-volume method was applied with the help of the SIMPLE algorithm to solve continuity, momentum, and energy equations. Several characteristics are assessed, including velocity streamline, isotherm contours, Nusselt number contours, the average Nusselt number ([Formula: see text]), the friction factor [Formula: see text], and drop pressure [Formula: see text]. The findings of the current analysis revealed that adding an impinging jet can boost the heat transfer rate up to [Formula: see text] better than a non-impingement jet. Also, a significant enhancement in the heat transfer rate was obtained when growing one of these parameters α, [Formula: see text], and E. Moreover, the ternary hybrid nanofluid with different nanoparticle forms significantly boosts the heat transfer rate compared to the traditional nanofluid. The maximum heat transfer is reached as the velocity of the impinging jet rises. Inclining the angle of the impinging jet inlet with [Formula: see text] toward the channel inlet boosted the rate of heat transfer up to [Formula: see text] compared to the perpendicular impinging jet [Formula: see text]. A strong consensus has been reached with the theoretical and experimental findings found in the literature.

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“…Experimental and numerical studies of the effect of the nozzle shape on the heat transfer by an impingement jet of a heated circular cylinder were carried out by Singh et al 11 They found a better Nusselt number at the stagnation point. Maghrabie et al 12 carried out a numerical study of cooling by a jet entering the transverse flow of an online network of heated obstacles. Results show that an increase in the Re ratio improves Nu .…”

Section: Introductionmentioning

confidence: 99%

Three‐dimensional turbulent forced convection around a hot cubic block exposed to a cross‐flow and an impinging jet

Boudraa

Bessaïh

2020

Heat Trans

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A numerical study of a three-dimensional, turbulent, forced convection flow around a hot cubic block exposed to cross-flow and an impinging jet is carried out. The standard k-ε turbulence model is used to study the effects of Reynolds number ratio on the flow and heat transfer. For each value of the Reynolds number of the jet, the Reynolds number ratio is equal to 1, 1.5, and 2. The influence of the channel height and the jet axis location are also examined. The governing equations are solved by using Ansys Fluent software 14.5. Results show that the heat transfer increases with the increase in the Reynolds number ratio. At the top of the cube, better cooling occurs with an increase in the speed of the impinging jet. A reduction in the height of the channel and the displacement of the axis of the jet toward the channel inlet improve the heat transfer. Our simulations are compared with experimental data found in the literature, using different turbulence models.

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Numerical investigation of heat transfer and pressure drop of in-line array of heated obstacles cooled by jet impingement in cross-flow

Cited by 28 publications

References 18 publications

Analysis of Thermal and Flow Characteristics in a Combined Cross-Flow and Jet-Flow Configuration with Flow-Guiding Fins

Analysis of Thermal and Flow Characteristics in a Combined Cross-Flow and Jet-Flow Configuration with Flow-Guiding Fins

Numerical investigations of heat transfer around a hot block subject to a cross-flow and an extended jet hole using ternary hybrid nanofluids

Three‐dimensional turbulent forced convection around a hot cubic block exposed to a cross‐flow and an impinging jet

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