Numerical simulation of heat transfer and turbulent flow of water nanofluids copper oxide in rectangular microchannel with semi-attached rib

Abstract

In this research, the effect of utilizing semi-attached rib on heat transfer and liquid turbulent flow of nanofluid watercopper oxide in three-dimensional rectangular microchannel has been investigated. The results of numerical examination of this study in comparison to those of smooth channel have also been evaluated. The range of Reynolds numbers is between 10,000 and 60,000 and the volume fraction of copper oxide nanoparticle in 0%, 2%, and 4% was examined. In this numerical simulation, the effects of the changes in parameters such as dimensions of semi-attached rib, volume fraction of the nanoparticle, and Reynolds number were considered. The results of this study showed that utilizing semiattached rib in microchannel with a ratio of 0 \ R/W 0.325 in producing stronger vortices, which causes better mixture in fluid layers, is weaker than that with tooth mode of R/W = 0 ratio. However, the main advantage of using tooth with a ratio of 0 \ R/W 0.325 in comparison to ordinary tooth is the increase in heat transfer and reduction in coefficient friction and pumping power.

Numerical investigation of the effect of water/Al2O3 nanofluid on heat transfer in trapezoidal, sinusoidal and stepped microchannels

“…In equations ( 1) to (8), the subscritps z, dr and m are denote the secondary phase of z, driving and mixture states (solid-liquid phases) (Tavakoli et al, 2019). Average Nusselt number is a dimensionless number which is the ratio of the convection heat transfer to conductive heat transfer (Khodabandeh et al, 2018a;Bakhshi et al, 2018;Pourdel et al, 2018;Manca et al, 2012;Akbari et al, 2016c;Alipour et al, 2017):…”

Thermal and Hydraulic Performance of CuO/Water Nanofluids: A Review

“…Several experiments have indicated that nanofluids are colloids [18][19][20][21][22] for specific applications, such as various general flow configurations [23][24][25][26][27][28][29] and radiators [30][31][32][33], because of their shear stress, non-Newtonian behaviour, and viscoelastic properties. Many researchers have reported the results of heat transfer for straight tube and microchannel at turbulent nanofluid [16,23,34,35] and laminar [28,36,37] flows. The common base fluids used for nanofluid preparations include engine oil, water and ethylene glycol [38][39][40].…”

WEDM of Copper for the Fabrication of Large Surface-Area Micro-Channels: A Prerequisite for the High Heat-Transfer Rate

“…Another way of enhancing the surface area is the use of different shapes of the micro-channels, e.g., plain, wavy, and interrupted fin [12]. Likewise, the use of V-shaped ribs arranged in a periodic order can augment the surface area [13] to improve the performance of micro-channels [14]. The saw-toothed profile is another alternate for high surface area [15].…”