Effect of tilt angle on the multi-pipe channel with sinusoidal/curved walls – numerical modelling based on finite volume method

Abstract

Purpose This paper aims to investigate the two-dimensional numerical modeling of fluid flow and heat transfer in a fluid channel. Design/methodology/approach The channel is filled with the CuO-water nanofluid. The KKL model is used to estimate the dynamic viscosity and considering Brownian motion. On the other hand, the influence of CuO nanoparticles’ shapes on the heat transfer rate is taken account in the simulations. The channel is included with several active pipes with hot and cold temperatures. Furthermore, the external curved and sinusoidal walls have cold and hot temperatures, respectively. Findings Three different tilt angles are considered with similar boundary and operating conditions. The Rayleigh numbers, solid volume fraction of CuO nanoparticles in the pure water and the tilt angles are the governing parameters. Different cases studies, such as streamlines, heat transfer rate, local and total entropy generation and heatlines, are analysed under influences of these governing parameters. Originality/value The originality of this work is investigation of fluid flow, heat transfer and entropy generation within a nanofluid filled channel using FVM.

Dual-MRT lattice Boltzmann method combined with experimental measurements of nanofluid’s properties for analysis of fin-orientation effect on natural convection heat transfer

“…The existence of thermal and velocity gradients between the walls within the enclosures makes the fluid in a non-equilibrium state and creates the entropy generation in the fluid media. Combination of linear transport theory with the local thermodynamic equilibrium, the local entropy generation can be defined as follow (Cihat Baytas , 1997;Baytas , 2000;Hooshmand et al, 2018;KhakRah et al, 2019):…”

Smoothed/profile lattice Boltzmann method for hydrothermal analysis of a corrugated parabolic-trough solar collector filled with nanofluid predicted by Koo–Kleinstreuer–Li model

“…In regards of numerous applications of natural convection phenomenon in the industries, this phenomenon becomes one of the interesting engineering topics. Some of the well-known applications are solar collector, geothermal systems, heating, ventilation, and air conditioning, cooling system of electronic packages, microelectromechanical systems, furnaces and so on (Rahimi et al , 2018a; Rahimi et al , 2019a; Rahimi et al , 2019b; Rahimi et al , 2019c; KhakRah et al , 2019; Hooshmand et al , 2019).…”

“…In regards of numerous applications of natural convection phenomenon in the industries, this phenomenon becomes one of the interesting engineering topics. Some of the well-known applications are solar collector, geothermal systems, heating, ventilation, and air conditioning, cooling system of electronic packages, microelectromechanical systems, furnaces and so on (Rahimi et al, 2018a;Rahimi et al, 2019a;Rahimi et al, 2019b;Rahimi et al, 2019c;KhakRah et al, 2019;Hooshmand et al, 2019). Varol et al (2010) took a detailed look into the influence of inclination angle on the performance of natural convective flow and heat transfer inside a divided cavity which HFF 32,5 is filled with various types of working fluids.…”

Thermal performance of parabolic-trough solar collector using double-population LBM with single-node/curved scheme and experimental evaluation on properties of SiO2-TiO2/EG nanofluid

“…In recent years, several investigations have been published which focuses on the natural convection phenomenon in different aspects such as thermal performance, hydrodynamic view, entropy production. The mentioned interest of the researcher to this phenomenon can be justified by its several applications which can be found everywhere with temperature gradient, fluid domain and gravity such as furnaces, heat exchanger, HVAC, cooling of electronic devices, geothermal systems, nuclear power plants Rahimi et al (2018), Rahimi et al (2019a), KhakRah et al (2019), Hooshmand et al (2019), Al-Rashed et al (2019), Rao et al (2019).…”