Analytical study of Al2O3-Cu/water micropolar hybrid nanofluid in a porous channel with expanding/contracting walls in the presence of magnetic field

Abstract

Abstract. Forced convection uid ow and heat transfer were investigated in a porous channel with expanding or contracting walls, which was lled with Al2O3-Cu/water micropolar hybrid nano uid in the presence of magnetic eld. In order to solve the governing equations analytically, the least square method was employed. The hot bottom wall was cooled by the coolant uid, which was injected into the channel from the top wall. The range of nanoparticles volume fraction (90% Al 2 O 3 and 10% Cu by volume) was between 0% and 2%. The e ects of consequential parameters such as Reynolds number, Hartmann number, micro rotation factor, and nanoparticles volume fraction on velocity and temperature pro les were examined. The results show that with increasing Reynolds number, the values of temperature and micro rotation pro les decrease. Furthermore, when the hybrid nano uid is used, compared to common nano uid, the heat transfer coe cient will increase signi cantly. It is also observed that when the Hartmann number increases, Nusselt number increases, too.

Hybrid nanofluid flow and heat transfer over a nonlinear permeable stretching/shrinking surface

“…They examined the behavior between pure water, Cu/water nanofluid and Cu-TiO 2 /water hybrid nanofluid on the velocity, microrotation and temperature distribution. There are many investigations on hybrid nanofluid that were conducted with various aspects by the researchers such as Yen et al (2007); Labib et al (2013), Nasrin and Alim (2014); Takabi and Shokouhmand (2015); Ghadikolaei et al (2017); Hayat and Nadeem (2017); Jamshed and Aziz (2018); Ashorynejad and Shahriari (2018); Ghalambaz et al (2019); Mollamahdi et al (2018); Usman et al (2018) and Rostami et al (2018). For instance, the collection of papers on nanofluids or hybrid nanofluids can be found in the book by Das et al (2007) and in the review papers such as Trisaksri and Wongwises (2007); Wang and Mujumdar (2007, 2008a, 2008b; Kakac and Pramuanjaroenkij (2009); Kamyar et al (2012); Sarkar et al (2015); Sidik et al (2016); Sundar et al (2017); Akilu et al (2016), Babu et al (2017); Leong et al (2017), Ahmadi et al (2018); Ali et al (2018) and Huminic and Huminic (2018).…”

Flow and heat transfer along a permeable stretching/shrinking curved surface in a hybrid nanofluid

“…They examined the behavior between pure water, Cu/water nanofluid and Cu-TiO 2 /water hybrid nanofluid on the velocity, microrotation and temperature distribution. More investigations on hybrid nanofluids have been conducted with various aspects by researchers such as Takabi and Shokouhmand [29], Ghadikolaei et al [30], Jamshed and Aziz [31], Ashorynejad and Shahriari [32], Ghalambaz et al [33], Mollamahdi et al [34], Usman et al [35] and Rostami et al [36]. For instance, a collection of papers on nanofluids or hybrid nanofluids can be found in the book by Das et al [37] and in review papers such as Trisaksri and Wongwises [38], Wang and Mujumdar [39][40][41], Kakaç and Pramuanjaroenkij [42], Kamyar et al [43], Sarkar et al [44], Sidik et al [45], Sundar et al [46], Akilu et al [47], Babu et al [48], Leong et al [49], Ahmadi et al [50], Ali et al [51], Huminic and Huminic [52], etc.…”

Numerical investigation into unsteady magnetohydrodynamics flow of micropolar hybrid nanofluid in porous medium

“…/ micropolar hybrid nanofluid in a permeable channel were scrutinized by Mollamahdi et al [12]. Shelukhin et al [13] discussed the thermodynamic properties of Bingham fluids with micropolar theory.…”