A numerical simulation of mixed convective and arbitrarily oblique radiative stagnation point slip flow of a CNT-water M
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A numerical simulation of mixed convective and arbitrarily oblique radiative stagnation point slip flow of a CNT‑water MHD nanofluid Prashanta Kumar Mandal1 · Gauri Shanker Seth1 · Subharthi Sarkar2 · Ali Chamkha3,4 Received: 25 July 2020 / Accepted: 5 October 2020 © Akadémiai Kiadó, Budapest, Hungary 2020
Abstract Numerical simulation of a non-linear mathematical model governing an arbitrarily oblique slip flow of a nanofluid, with suspended carbon nanotubes in water, agitated by magnetic field, mixed convection currents and thermal radiation is carried out. The cases for both single-wall carbon nanotubes (SWCNTs) and multi-wall carbon nanotubes (MWCNTs) are taken under consideration to gain a wider perspective. Globally, heat transfer rate for SWCNTs is found to be more effective in comparison to the MWCNTs, as the former offers less resistance in terms of the overall drag or shear. In addition, it is found that the magnetic field increases the skin friction by increasing the obliqueness of the flow. Numerical validation with available studies in the literature shows excellent conformity. The results will have bearing in thermal management of the heat exchange processes occurring within the devices used in polymer industries and polymer technology. Keywords Non-aligned stagnation point flow · Carbon nanotubes · Convective heat transfer · Navier slip · MHD flows
Introduction Due to the rapid advancement in automation in every sphere of day-to-day life, there is a steep demand for high performance and competent coolants in abundant industrial processes such as power production, automobiles, metallurgy, medical equipment and electronics. Liquids such as water, oils, polymer solutions, ethylene glycol have a poor heat transfer rate because of low thermal conductivity. Researchers moved on the way to the non-natural liquids by adding micro/nano-sized particles of metal and their oxides into those base liquids to improve the thermal conductivity which leads to the foundation of nanofluids. Indeed, it was Choi et al. [1] who initiated a sea change in the characteristics of * Ali Chamkha [email protected] 1
Department of Mathematics and Computing, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, India
2
Department of Mathematics, Banwarilal Bhalotia College, Asansol 713303, India
3
Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam
4
Institute of Theoretical and Applied Research (ITAR), Duy Tan University, Hanoi 100000, Vietnam
traditional liquids. This leads several researchers to engage their brilliant minds in advancing research involving nanofluids due to its insurmountable demand in an extensive range of engineering and industrial applications. As such, abundant research has been carried out in recent times to investigate the thermo-physical properties and uses of nanofluids [2–12]. In the paper by Buongiorno [2], he emphasized to consider the impacts of thermophoresis and Brownian motion in the study of nanofluids. This model is kn
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