Numerical study of laminar pulsed impinging jet on the metallic foam blocks using the local thermal non-equilibrium model

Hosseinalipour, Seyed Mostafa; Rashidzadeh, Soroush; Moghimi, Mahdi; Esmailpour, Kazem

doi:10.1007/s10973-019-09225-1

Cited by 12 publications

(4 citation statements)

References 37 publications

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“…Hosseinalipour vd. [40] üzerinde gözenekli bir ısı alıcı bulunan sıcak düz bir plakanın hava jeti ile soğutulmasında periyodik hız değişiminin ısı transferi ve entropi üretimine etkilerini laminer akış için analiz etmişlerdir. Li vd.…”

Section: Gi̇ri̇ş (Introduction)unclassified

Elektronik Bileşenlerin Bir Çift Slot Jet ile Soğutulmasında Nozül Konumunun Soğutma Performansına Etkisi

2024

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Bu çalışmada, elektronik bileşenlerin bir çift slot jet ile soğutulmasında nozül konumunun akış yapısı ve taşınımla ısı transfer karakteristiklerine etkileri sayısal olarak incelenmiştir. Nozül genişlikleri ve jet Reynolds sayıları eşit alınarak dört farklı nozül konumu (JK 1-2, JK 1-3, JK 1-4 ve JK 1-5) için Reynolds sayısının 100 ile 500 değerleri arasında, laminer rejimde iki-boyutlu hesaplamalar gerçekleştirilmiştir. Sayısal hesaplamalar ANSYS Fluent yazılımı ile yürütülürken, farklı Reynolds sayıları ve jet konumları için hız ve sıcaklık konturları, ısı kaynaklarının yüzeylerinde yerel ve ortalama Nusselt sayılarının değişimi ve genel ortalama Nusselt sayısının değişimi incelenmiştir. Çalışma sonucunda, akış yapısı ve taşınımla ısı transfer karakteristiklerinin nozül konumundan oldukça etkilendiği, sistemin geneli için taşınımla ısı transfer hızının JK 1-2’de diğer durumlara oranla daha yüksek olduğu ve ikinci nozülün çıkışa doğru kayması ile birlikte taşınımla ısı transfer hızının sistemin geneli için azaldığı belirlenmiştir.

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Section: Gi̇ri̇ş (Introduction)unclassified

Elektronik Bileşenlerin Bir Çift Slot Jet ile Soğutulmasında Nozül Konumunun Soğutma Performansına Etkisi

2024

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“…Furthermore, the lowest entropy for flat impinging surface is presented for the nanofluid with nanoparticle volume concentration of 3.0% and blade shape of nanoparticles. A numerical investigation on pulsed imping jet on metal foam employing the local thermal nonequilibrium model is carried out by Hosseinalipour et al [4]. The authors found that higher amplitudes of pulsation increases the thermal performance of the impingement jet.…”

Section: Introductionmentioning

confidence: 99%

Entropy Generation Analysis on Confined Impinging Slot Jets with Nanofluids in Metal Foam

Buonomo

Pasqua

Manca

et al. 2022

J. Phys.: Conf. Ser.

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In this paper a numerical entropy generation analysis on confined slot impinging jets made up of a totally filled configuration of metal foam in mixed convection is presented. A two-dimensional domain is assumed and several Peclet numbers (equal to 350, 750, 1500) are considered. Rayleigh numbers is imposed equal to 30000. The employed working fluids are pure water or Al2O3/water based nanofluids. The nanoparticle volume concentrations are in a range from 0% to 4% and the nanoparticle diameter is varied in a range from 20 nm to 80nm. The target surface is characterized by a constant temperature, estimated starting to the value of Rayleigh number. The distance of the target surface is five times greater than the slot jet width. The thermal and fluid dynamic properties of nanofluids are evaluated by a single-phase model method. The model of local thermal non equilibrium (LTNE) is considere in order to simulate the behavior of the metal foam characterized by a number of pores per inch (PPI) equal to 5, 10, 20, 40 and a porosity around 0.90. The data in terms of total global entropy generation related to the thermal and viscous effects are given Results show increasing values of the total entropy generation for increasing values of Peclet number and nanoparticle concentration. This behaviour is more evident at higher Peclet number values. In addition, the total entropy generation increases with the increase of PPI in corresponding to the same porosity value.

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“…It was revealed that the reduction of Darcy number enhances the stagnation Nusselt number, excluding in the wall jet region. The study carried out by Hosseinalipour et al (2020) considered the problem of laminar pulsed impinging jet with porous blocks, and they presented the effect of pulsation frequencies and amplitudes, porous blocks on thermal behavior by using LTNE for porous medium.…”

Section: Introductionmentioning

confidence: 99%

Nanofluid jet impingement heating of a cooled surface with a constant heat flux in the presence of porous layer

Çiçek

Baytaş

2021

HFF

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Purpose The purpose of this study is to numerically investigate the confined single-walled carbon nanotube-water nanofluid jet impingement heating of a cooled surface with a uniform heat flux in the presence of a porous layer. The analysis of the convective heat transfer mechanism is introduced considering the buoyancy force effect under local thermal non-equilibrium conditions. Design/methodology/approach The governing equations for the nanofluid and solid phase are discretized by the finite volume method and the SIMPLE algorithm is used to solve these equations. Findings It is observed that there is an increase in a local variation of temperature along the upper wall with increasing Reynolds, Darcy and Grashof numbers. For given parameters, the optimum values of thermal conductivity ratio and porous layer thickness leading to better heating on the upper wall are found as Kr = 1.0 and S = 0.5, respectively. The maximum and minimum values of temperature on the upper wall are obtained in the case of higher nanoparticle volume fraction at Re = 100, however, the temperature values get higher along the upper wall with increasing nanoparticle volume fraction at Re = 300. Originality/value The effects of various parameters, such as Reynolds number, Darcy number and Grashof number, on thermal behavior and nanofluid flow are examined to determine the desirable heating conditions for the upper wall. This paper provides a solution to problems such as icing on the surface with a suitable thermal design and optimum geometric configuration.

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Numerical study of laminar pulsed impinging jet on the metallic foam blocks using the local thermal non-equilibrium model

Cited by 12 publications

References 37 publications

Elektronik Bileşenlerin Bir Çift Slot Jet ile Soğutulmasında Nozül Konumunun Soğutma Performansına Etkisi

Elektronik Bileşenlerin Bir Çift Slot Jet ile Soğutulmasında Nozül Konumunun Soğutma Performansına Etkisi

Entropy Generation Analysis on Confined Impinging Slot Jets with Nanofluids in Metal Foam

Nanofluid jet impingement heating of a cooled surface with a constant heat flux in the presence of porous layer

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