Numerical simulation of nanofluid flow in an annulus with porous baffles based on combination of Darcy-Brinkman-Forchheimer model and two-phase mixture model

Document Type : Research Article

Authors

1 Islamic Azad University of Mashhad

2 Department of Mechanical Engineering, Mashhad Branch, Islamic Azad University, Mashhad, Iran

Abstract

In this paper, forced convection heat transfer of a nanofluid in an annulus with porous baffles on the inner and outer walls is investigated numerically. The nanofluid is simulated based on the two-phase mixture model while the flow in the porous region is described by the Darcy-Brinkman-Forchheimer model. The fluid flow is considered laminar, steady, axisymmetric, and incompressible. The governing equations have been solved using the finite volume method. The effect of parameters such as the Darcy number, the height of the porous baffles, the thermal conductivity ratio, and the volume fraction, and the type of the nanoparticles on the flow field, heat transfer, and pressure drop have been investigated. The results show that the use of the porous baffles in the flow path leads to significant variations in the characteristics of the flow and heat transfer. Reducing the Darcy and Reynolds numbers leads to the formation of vortices behind the baffles that has a significant impact on the heat transfer. By decreasing the Darcy number, the heat transfer increases substantially. This also causes a severe pressure drop in the flow. Increasing the thermal conductivity ratio raises the local Nusslet number at the wall near the baffles, which is more remarkable in higher values of permeability. Increasing the height of the porous baffles reduces the thickness of the boundary layer and enhances heat transfer.

Keywords

Main Subjects

References

[1] M.J. Maghrebi, M. Nazari, T. Armaghani, Forced convection heat transfer of nanofluids in a porous channel, Transport in Porous Media, 93(3) (2012) 401-413.
[2] M. Hajipour, A.M. Dehkordi, Analysis of nanofluid heat transfer in parallel-plate vertical channels partially filled with porous medium, International Journal of Thermal Sciences, 55 (2012) 103-113.
[3] M. Hajipour, A.M. Dehkordi, Mixed-convection flow of Al2O3–H2O nanofluid in a channel partially filled with porous metal foam: Experimental and numerical study, Experimental Thermal and Fluid Science, 53 (2014) 49-56.
[4] Y.T. Yang, C.Z. Hwang, Calculation of turbulent flow and heat transfer in a porous-baffled channel, International Journal of Heat and Mass Transfer, 46(5) (2003) 771-780.
[5] K.H. Ko, N.K. Anand, Use of porous baffles to enhance heat transfer in a rectangular channel, International Journal of Heat and Mass Transfer, 46(22) (2003) 4191-4199.
[6] N. Targui, H. Kahalerras, Analysis of fluid flow and heat transfer in a double pipe heat exchanger with porous structures, Energy Conversion and Management, 49 (11) (2008) 3217-3229.
[7] H. Li, K. Leong, L. Jin, J. Chai, Analysis of fluid flow and heat transfer in a channel with staggered porous blocks, International Journal of Thermal Sciences, 49(6) (2010) 950-962.
[8] A. Davari, M. Maerefat, Numerical analysis of fluid flow and heat transfer in entrance and fully developed regions of a channel with porous baffles, Journal of Heat Transfer, 138(6) (2016) 062601.
[9] M. Siavashi, H.R.T. Bahrami, H. Saffari, Numerical investigation of porous rib arrangement on heat transfer and entropy generation of nanofluid flow in an annulus using a two-phase mixture model, Numerical Heat Transfer, Part A: Applications, 71(12) (2017) 1251-1273.
[10] I. Zahmatkesh, S.A. Naghedifar, Oscillatory mixed convection in the jet impingement cooling of a horizontal surface immersed in a nanofluid-saturated porous medium, Numerical Heat Transfer, Part A: Applications, 72 (5) (2017) 401-416.
[11] I. Zahmatkesh, S.A. Naghedifar, Pulsating nanofluid jet impingement onto a partially heated surface immersed in a porous layer, Jordan Journal of Mechanical and Industrial Engineering, 12(2) (2018) 99-107.
[12] D.G.P. Guthrie, M. Torabi, N. Karimi, Combined heat and mass transfer analyses in catalytic microreactors partially filled with porous material - The influences of nanofluid and different porous-fluid interface models, International Journal of Thermal Sciences, 140 (2019) 96-113.
[13] J. Alsarraf, A. Moradikazerouni, A. Shahsavar, M. Afrand, H. Salehipour, M.D. Tran, Hydrothermal analysis of turbulent boehmite alumina nanofluid flow with different nanoparticle shapes in a minichannel heat exchanger using two-phase mixture model, Physica A, 520 (2019) 275–288.
[14] E. Torshizi, I. Zahmatkesh, Comparison between single-phase, two-phase mixture and Eulerian-Eulerian models for the description of jet impingement of nanofluids, Journal of Applied and Computational Sciences in Mechanics, 27(2) (2016) 55-70. (in Persian)
[15] S.E. Maiga, C.T. Nguyen, N. Galanis, G. Roy, Heat transfer behaviors of nanofluids in a uniformly heated tube, Superlattices and Microstructures, 35(3-6) (2004) 543-557.
[16] M. Manninen, V. Taivassalo, S. Kallio, On the mixture model for multiphase flow, Technical Research Centre of Finland, Finland, 1996.
[17] L. Schiller, A. Naumann, A drag coefficient correlation, Zeitschrift des Vereins Deutscher Ingenieure, 38 (1935) 318–320.
[18] K. Vafai, Convective flow and heat transfer in variable-porosity media, Journal of Fluid Mechanics, 147 (1984) 233-259.
[19] H. Li, K. Leong, L. Jin, J. Chai, Analysis of fluid flow and heat transfer in a channel with staggered porous blocks, International Journal of Thermal Sciences, 49(6) (2010) 950-962.
Amirkabir Journal of Mechanical Engineering
Volume 53, Issue 3 (Special Issue)
June 2021
Pages 1897-1914

Files

Share

How to cite

Statistics