Abstract
The authors of the present paper sought to conduct a numerical study on the convection heat transfer, along with the radiation and entropy generation (EGE) of a nanofluids (NFs) in a two and three-dimensional square enclosure, by using the FVM. The enclosure contained a high-temperature blade in the form of a vertical elliptical quadrant in the lower corner of the enclosure. The right edge of the enclosure was kept at low temperature, while the other edges were insulated. The enclosure was subjected to a magnetic field (MGF) and could be adjusted to different angles. In this research, two laboratory relationships dependent on temperature and volume fraction were used to simulate thermal conductivity and viscosity. The variables of this problem were Ra, Ha, RAP, nanoparticle (NP) volume fraction, blade aspect ratio, enclosure angles, and MGF. Evaluating the effects of these variables on heat transfer rate (HTR), EGE, and Be revealed that increasing the Ra and reducing the Ha could increase the HTR and EGE. On the other hand, adding radiation HTR to the enclosure increased the overall HTR. Moreover, an augmentation of the volume fraction of magnesium oxide NPs led to an increased amount of HTR and EGE. Furthermore, any changes to the MGF and the enclosure angle imposed various effects on the HTR. The results indicated that an augmentation of the size of the blade increased and then decreased the HTR and the generated entropy. Finally, increasing the blade always increased the Be.
Highlights
Far, a large body of research has been conducted on nanofluids (NFs), which are referred to as fluids containing one or more NPs in a base fluid [1,2,3]
The novelty of the present work is the use of an MgO/water nanofluid in a cavity while considering volumetric radiaotifoannaMndgOde/swpaitteerthneaneollfliputiidcailnbaarcraiveirtybewinhgileucnodnesridtheeriinngflvuoelnucmeeotfriac mraadgianteiotinc afinedldd. espite the elliptical barrier being under the influence of a magnetic field
PTsh.eInadthdiisticoanseo,fbNotPhsgirnacprheasssehdowtheanthaesrcmenadl icnogntdruenctdivity of the with increaflsuinidg aNnPdsuinltiwmaatteerl.yTihnceraedasdeidtioHnToRf aNnPdsEinGcEre. ased the thermal conductivity of the fluid and increased heat transfer rate (HTR) and EGE
Summary
A large body of research has been conducted on nanofluids (NFs), which are referred to as fluids containing one or more NPs in a base fluid [1,2,3]. Due to the advantages of numerical simulation, many researchers have used numerical methods to analyze fluid flow and heat transfer [7,8,9,10,11] In this regard, closed enclosures are among the uses of NFs [12,13,14,15,16]. The relations derived from the experimental data were used to simulate the thermal conductivity and viscosity These relationships were found to depend on the volume fraction of the NPs and the temperature. Processes 2021, 9, 1277 used to simulate the thermal conductivity and viscosity The novelty of the present work is the use of an MgO/water nanofluid in a cavity while considering volumetric radiaotifoannaMndgOde/swpaitteerthneaneollfliputiidcailnbaarcraiveirtybewinhgileucnodnesridtheeriinngflvuoelnucmeeotfriac mraadgianteiotinc afinedldd. espite the elliptical barrier being under the influence of a magnetic field
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