Numerical Modelling of Fluid Flow and Heat Transfer of (TiO₂-Water) Nanofluids in Wavy duct

Abstract

This paper investigates numerically pressure drop and forced convection heat transfer of TiO2-water nanofluids laminar flow through a horizontal curvilinear form or wavy duct with using four baffle height ratio h/H=0.15, 0.25, 0.35 and 0.45. This flow has been investigated assuming constant wall heat flux boundary condition by using ANSYS-Fluent with the finite volume method to discretize the nanofluids. The study has aimed to show the possibility of intensification of heat transfer by adding nanoparticles to the main coolant. The model employed in this study is a single phase (homogenous and dispersion). The effects of various factors, such as Reynolds number (Re) and nanoparticle concentration (φ), on the flow field and thermal distribution of the Nanofluids, have been analysed. The present results show that nanoparticle concentration and Reynolds number play a prevalent role in the horizontal wavy duct. The Nusselt number has increased by 54 % when using high nanoparticle concentration of (0.4 vol. %) at high Reynolds number of (1250), also the skin friction factor increased by (32%) in the same conditions. The results provide good predictions to enhancement the heat transfer. Predictably, as nanoparticle volume fraction and/or the Reynolds number increases, the heat transfer increases. However, the flow is accompanied by high friction factor and consequently, higher pressure drop.

Experimental and Numerical Investigation of Convection Heat Transfer in an Enclosure With a Vertical Heated Block and Baffles

“…Many engineering applications, such as heat exchangers, electronic system cooling, air conditioning, nuclear reactor cooling, industrial furnaces and solar energy storage, require deep investigation for convective heat transfer system. Different methods, such as Nano fluids, functionally graded materials and extrude baffles, are widely used to enhance heat transfer which is useful to keep the temperature-dependent material properties at designed ranges, increase efficiency of cooling units or reduce pump power of heat exchanger [1][2][3][4][5]. Many experimental and theoretical investigations are performed to study the heat transfer performance in enclosures with baffles.…”