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

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Abstract

In this study, thermal performance of an impingement jet with the presence of porous block is numerically investigated. The study is comprised of two main parts. At first, a parametric study is conducted on the steady impingement jet with porous block. Later, the effect of porous block is assessed on the pulsative impingement jet. The effect of different pulsation frequencies and amplitudes is analyzed on the heat transfer between the jet and porous block. In order to model the thermal performance, the local thermal non-equilibrium model is applied to the system. An entropy generation study was also conducted in order to investigate the system’s performance from second law of thermodynamics point of view. In addition to the mentioned studies, by utilizing the energy density flux vector, different regimes of heat transfer in various cases are demonstrated and some of the trends obtained in parametric study are justified. The results suggest that porous block can change the Nusselt number distribution on the target plate. A more flattened Nusselt number distribution is observed with the presence of porous blocks. While lower frequencies and amplitudes of pulsation do not affect the thermal performance of the jet, higher ones have a moderate effect on the heat transfer rate of the impinging jet.

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Abbreviations

\(a\) :

Interstitial area between phases

\({\text{Br}}\) :

Brinkman number

\(C\) :

Specific heat capacity

\(C_{\text{F}}\) :

Forchheimer coefficient

\({\text{Da}}\) :

Darcy number

\(d\) :

Inlet width

\(h\) :

Heat transfer coefficient

\(H\) :

Nozzle distance to target plate

\(H_{\text{p}}\) :

Height of porous block

\(H^{*}\) :

Dimensionless height, \(H^{*} = \frac{{H_{\text{p}} }}{H}\)

\(K\) :

Permeability

\(k\) :

Thermal conductivity

\({\text{Nu}}\) :

Nusselt number

\(p\) :

Thermodynamic pressure

\(q^{{\prime \prime }}\) :

Heat flux

\({\text{Re}}\) :

Reynolds number based on nozzle width

\({\text{St}}\) :

Strouhal number

\(T\) :

Temperature

\(u\) :

Velocity

\(\varphi\) :

Porosity

\(\mu\) :

Dynamic viscosity

\(\rho\) :

Density

f:

Fluid

j:

Inlet

s:

Solid

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Acknowledgements

We would like to thank the Energy, Water and Environment Research Laboratory at Iran University of Science and Technology for providing their expertise and encouragement throughout this project.

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Authors and Affiliations

  1. School of Mechanical Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran, 1684613114, Iran

    Seyed Mostafa Hosseinalipour, Soroush Rashidzadeh & Mahdi Moghimi

  2. Renewable Energy Research Center, Damavand Branch, Islamic Azad University, Damavand, Iran

    Kazem Esmailpour

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  1. Seyed Mostafa Hosseinalipour
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  2. Soroush Rashidzadeh
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  4. Kazem Esmailpour
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Correspondence to Mahdi Moghimi.

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Hosseinalipour, S.M., Rashidzadeh, S., Moghimi, M. et al. Numerical study of laminar pulsed impinging jet on the metallic foam blocks using the local thermal non-equilibrium model. J Therm Anal Calorim 141, 1859–1874 (2020). https://doi.org/10.1007/s10973-019-09225-1

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