Enhancement of heat transfer of nanofluids in the presence of sinusoidal side obstacles between two parallel plates through the lattice Boltzmann method. (June 2019)

• Record Type: Journal Article
• Authors: Abchouyeh, Monireh Asadi; Fard, Omid Solaymani; Mohebbi, Rasul; Sheremet, Mikhail A.
• Is Part Of: International journal of mechanical sciences. Volume 156(2019)
• Page Start: 159
• Page End: 169
• Publication Date: 2019-06
• Subjects: Nanofluid -- Forced convection heat transfer -- LBM -- Nusselt number -- Sinusoidal side obstacles; Mechanical engineering -- Periodicals; Génie mécanique -- Périodiques; Mechanical engineering; Maschinenbau; Mechanik; Zeitschrift; Periodicals; 621.05
• DOI: 10.1016/j.ijmecsci.2019.03.035
• Languages: English
• ISSNs: 0020-7403

Abstract

Highlights: Heat transfer and nanofluid flow around four sinusoidal side obstacles in a horizontal channel is numerically studied by LBM. Effects of the Reynolds number and nanoparticles volume fraction at different non-dimensional amplitudes of the wavy wall of the sinusoidal obstacles are studied. A growth of the Reynolds number leads to a rise of the temperature gradient on the walls of the channel. An increment of nanoparticles concentration results in the heat transfer enhancement. Abstract: In the present study, heat transfer by two-dimensional incompressible nanofluids around four sinusoidal side obstacles in a horizontal channel is numerically analyzed via the lattice Boltzmann method (LBM). The liquid in the channel is a water containing copper nano-sized particles. The viscosity and effective thermal conductivity of the nanoliquid are respectively defined through the Brinkman and Patel approaches. Analysis is run for various magnitudes of the Reynolds number ( Re = 100, 200, 400) and nano-sized particles concentration ( ϕ = 0, 0.03, 0.05) at different non-dimensional amplitudes ( A = 0, 10, 20) of the wavy wall of the sinusoidal obstacles. The effects of changing the distance between the obstacles regarding their arrangement inside the channel are also investigated. The obtained data are presented with reference to the streamlines, temperature and Nusselt numbers profiles. The results indicate that, as the magnitude of the nano-sized particles concentration increases and the distance between the obstacles decreases, the mean Nusselt number rises. In addition, decreasing in the wavy border amplitude results to the thermal transmission enhancement. Graphical abstract: Image, graphical abstract