A Numerical Analysis of Laminar Forced Convection and Entropy Generation of a Diamond-Fe3O4/Water Hybrid Nanofluid in a Rectangular Minichannel

Abstract

The convective heat transfer and entropy generation of diamond-Fe3O4/water hybrid nanofluid through a rectangular minichannel is numerically investigated under laminar flow conditions. Nanoparticle volume fractions for diamond-Fe3O4/water hybrid nanofluid are in the range 0.05-0.20% and Reynolds number varies from 100 to 1000. The finite volume method is used in the numerical computation. The results obtained for diamond-Fe3O4/water hybrid nanofluid are compared with those of diamond/water and Fe3O4/water conventional nanofluids. It is found that 0.2% diamond-Fe3O4 hybrid nanoparticle addition to pure water provides convective heat transfer coefficient enhancement of 29.96%, at Re=1000. The results show that diamond-Fe3O4/water hybrid nanofluid has higher convective heat transfer coefficient and Nusselt number when compared with diamond/water and Fe3O4/water conventional nanofluids. For diamond-Fe3O4/water hybrid nanofluid, until Re=600, the lowest total entropy generation rate values are obtained for 0.20% nanoparticle volume fraction. However, after Re=800, diamond-Fe3O4/water hybrid nanofluid with 0.20% nanoparticle volume fraction has the highest total entropy generation rate compared to other nanoparticle volume fractions. A similar pattern emerges from the comparison with diamond/water and Fe3O4/water conventional nanofluids. For 0.2% nanoparticle volume fraction, diamond-Fe3O4/water hybrid nanofluid and diamond/water nanofluid have their minimum entropy generation rate at Re=500 and at Re=900, respectively. Moreover, this minimum entropy generation rate point changes with nanoparticle volume fraction values of nanofluids.

Mathematical modeling of (Cu−Al2O3) water based Maxwell hybrid nanofluids with Caputo-Fabrizio fractional derivative

“…To solve equations (11) and (14), the Laplace transform method will be used and closed form solutions will be developed for the velocity and temperature respectively subject to the corresponding initial and boundary conditions from equations (15) to (17).…”

“…Applying the Laplace transform to equation (14), keeping in mind the Laplace transform of Caputo-Fabrizio fractional operator defined in equation (8), and using the corresponding initial condition from equation (15) yield the following transformed energy balance:…”

“…Farhana et al 13 analyzed the flow of nano and hybrid nanofluid in tube of solar collector for three different designed models. Uysal et al 14 discussed the heat transfer due to conduction with entropy generation for a hybrid nanofluid flow through a minichannel and have been concluded that for a small addition of hybrid nanoparticle to pure water there is considerable increase in heat transfer coefficient and flux at boundary. Hayat et al 15 presented a comparison among the simple and hybrid nanofluids and found that even in the existence of heat source, chemical reaction, and radiations, the heat flux of Hybrid nanofluid is higher than the conventional nanofluid.…”

Radiative MHD flow of hybrid nanofluid past a porous stretching cylinder for heat transfer enhancement

“…They found that injection is a sufficient condition to reduce the skin friction and water is a better coolant than air under the injection process, and they also found that thermal conductivity enhances and the magnetic effect suppresses the skin friction. Following the footsteps of Wang, many researchers enriched the literature by discussing the various physical models in the arena of extending cylinders, such as Mukhopadhyay, 25 Wang, 26 Abbas et al, 27 Uysal et al, 28 and Usman et al 29 The influence of Lorentz force arising due to external applied magnetic field over an extending cylinder was initially analyzed by Ashorynejad et al 30 and was further discussed by Elbashbeshy et al 31 To the authors' best knowledge, no studies have been performed on the hybrid nanofluid movement past a stretching porous cylinder with the effect of radiation, Lorentz force, suction, and variable viscosity. The above-mentioned physical model has many applications in engineering and technology field.…”

Mitigation of Flow Maldistribution in Minichannel and Minigap Heat Exchangers by Introducing Threshold in Manifolds

“…There are among others: power industry (Mikielewicz & Mikielewicz, 2010), space industry (Brutin et al 2013), automotive industry (Sakamatapan & Wongwises, 2014), avionics industry (Najim & Feddaoui, 2018), solar industry (Zhou et al 2017), cryogenic industry (Zhou et al 2014), refrigeration industry (García-Cascales et al 2017), chemical and biological industry (Amador et al 2004). There are also some works that are trying to combine the minichannels with nanofluids (Uysal et al 2019).…”