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Water-based ‘nanofluid’ flow owing to an unsteady stretched surface is inspected in this paper considering Stefan blowing and thermal radiation. ‘Similarity transformations’ are applied to reduce the governing ‘partial differential equations’ (PDEs) for momentum, energy and concentration into ‘nonlinear’ ‘ordinary differential equations’ (ODEs). By using a shooting technique, those equations are solved numerically with the help of fourth-order ‘Runge–Kutta method’. ‘Wall shear stress’ rises but ‘heat transfer’ as well as ‘mass transfer coefficients’ reduce for the augmentation in ‘Stefan blowing/suction parameter’. ‘Temperature’ and ‘concentration’ of nanoliquid are found to rise but liquid’s ‘velocity’ reduces for the growing of ‘nanoparticle’s volume fraction’. Liquid’s ‘velocity’ and ‘concentration’ are observed to decrease for enhanced ‘Lewis number’. Based on the results presented here as well as their anatomical analysis, the relevant parameters significantly affect the stream, warmth and mass transports.

This paper investigates the dissipative Casson ternary hybrid nanoflow comprising Ag, Cu, and ${\mathrm{\text{MoS}}}_2$ nanocomposite, over a flat plate. Incorporating the thermal source, varying temperature, and concentration provides the required novelty of the study. The physical flow model has been computationally resolved using the Bvp4c approach, after the transformation of the system of PDEs into coupled ODEs. The effects of various parameters on the velocity, temperature, mass distribution profiles, rate of shear stress, Nusselt number, and Sherwood number are shown in figures and tables. The thermo transposition rate in Newtonian, hybrid Newtonian, Casson, and Casson hybrid Newtonian fluids increases by 83%, 115%, 152%, and 183%, respectively, with the enhancement of the dissipation effect. Furthermore, the Sherwood coefficient increases by 31% for each of the four fluid types, while the variable mass index measurement improves. The results indicate a significant advancement in bio-nanofluid dynamics, presenting considerable prospects for optimizing heat transfer in bioengineering. An important concordance between the present investigation and the prior one has also been shown.

In this paper, the swirling nanofluid flow which is driven by a rotating bottom disk of a cylindrical container under magnetic field effect and temperature gradient is considered. Effects of electrical conductivity of cylindrical walls on heat transfer enhancement are numerically analyzed. The governing equations that describe the combined problem (magnetohydrodynamics and mixed convection) under the adoptive assumptions are solved numerically by the finite volume technique. Calculations were made for fixed Reynolds number (Re$=$1000), Richardson number (0$\le$Ri$\le$2), aspect ratio ($H/R=2$), Hartmann number (0$\le$Ha$\le$60), and solid nanoparticle (copper) with volume fraction ($\varphi =0.1$). Five cases are considered in this study: (EI-Walls), (EC-Walls), (EC-Bottom), (EC-Top), and (EC-Sidewall). A decrease in the mean Nusselt number was found with the increase of the Richardson number due to stratification layers. These latter limits the heat transfers between the hot and cold zones of the cylinder. The results indicate that the Nusselt number gets bigger within a certain range of Hartmann numbers, and especially when the rotating lid is electrically conducting. Indeed, average Nusselt number decreases while the Hartmann number increase after it exceeds a critical value. Finally, the electrical conductivity of the rotating lid plays an important role in heat transfer enhancement in nanofluid swirling flow.