Application of different CFD multiphase models to investigate effects of baffles and nanoparticles on heat transfer enhancement

doi:10.1007/s11705-014-1437-7

Front. Chem. Sci. Eng.

2014, Vol. 8

Issue (3) : 320-329 https://doi.org/10.1007/s11705-014-1437-7

RESEARCH ARTICLE

Application of different CFD multiphase models to investigate effects of baffles and nanoparticles on heat transfer enhancement

Ali SHAHMOHAMMADI,Arezou JAFARI(

)

Chemical Engineering Department, Tarbiat Modares University, Tehran 114-14115, Iran

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Abstract

In this work, the effect of baffles in a pipe on heat transfer enhancement was studied using computational fluid dynamics (CFD) in the presence of Al₂O₃ nanoparticles which are dispersed into water. Fluid flow through the horizontal tube with uniform heat flux was simulated numerically and three dimensional governing partial differential equations were solved. To find an accurate model for CFD simulations, the results obtained by the single phase were compared with those obtained by three different multiphase models including Eulerian, mixture and volume of fluid (VOF) at Reynolds numbers in range of 600 to 3000, and two different nanoparticle concentrations (1% and 1.6%). It was found that multiphase models could better predict the heat transfer in nanofluids. The effect of baffles on heat transfer of nanofluid flow was also investigated through a baffled geometry. The numerical results show that at Reynolds numbers in the range of 600 to 2100, the heat transfer of nanofluid flowing in the geometry without baffle is greater than that of water flowing through a tube with baffle, whereas the difference between these effects (nanofluid and baffle) decreases with increasing the Reynolds number. At higher Reynolds numbers (2100–3000) the baffle has a greater effect on heat transfer enhancement than the nanofluid.

Keywords CFD simulation heat transfer nanofluid baffle single phase model multiphase model

Corresponding Author(s): Arezou JAFARI

Issue Date: 11 October 2014

Cite this article:

Ali SHAHMOHAMMADI,Arezou JAFARI. Application of different CFD multiphase models to investigate effects of baffles and nanoparticles on heat transfer enhancement[J]. Front. Chem. Sci. Eng., 2014, 8(3): 320-329.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-014-1437-7
https://academic.hep.com.cn/fcse/EN/Y2014/V8/I3/320

Fig.1 (a) Schematic view of pipe1, and (b) grid of pipe 1

Fig.2 (a) Schematic view of pipe 2 with seven internal baffles, and (b) grid of pipe 2

Tab.1 Thermo-physical properties of Al₂O₃-water nano?uids

Tab.2 Nusselt number at different grids

Fig.3 Comparison of numerical and experimental data at x = 285 mm (a= 0.6%, b= 1%, c= 1.6%)

Fig.4 Comparison of numerical and experimental data at x = 522 mm (a= 0.6%, b= 1%, c= 1.6%)

Fig.5 Difference between Eulerian and mixture models at 10% concentration of nanoparticle

Tab.3 Comparison between Eulerian and mixture models at turbulent regime

Fig.6 Effect of baffle (pipe 2) on Nusselt number at (a) x = 285 mm, and (b) x = 522 mm

Fig.7 Effects of baffle (pipe 2) and the nanofluid (pipe 1) with different volume fractions on the Nusselt number at (a) x = 285 mm, and (b) x = 522 mm

Fig.8 Temperature contour of fluid flow through baffled and non-baffled geometry (a) at Re= 1600 and (b) at Re= 2500

Fig.9 Effect of baffle on heat transfer of Al₂O₃/water nanofluids (a: x = 285 mm, b: x = 522 mm)

Tab.4 Nomenclature

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