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48. Exploring shape and size variations significance in hybrid nanofluid flow via rotating porous channel.

Author

Raza, Qadeer, Wang, Xiaodong, Ali, Bagh, and Shah, Nehad Ali

Abstract

The current study investigates the thermal performance characteristics of metallic (Cu) and non‐metallic (TiO2) nanoparticles (NPs), considering variations in their shapes and sizes. Specifically, analysis is conducted for four distinct stable shapes of NPs. A hybrid model is developed to analyze the influence of rotating porous walls on the system, particularly focusing on the impact of the permeable Reynolds number and NPs within a specific range of 0<φ1,φ2≤0.1$0 < {\varphi }_1,{\varphi }_2 \le 0.1$, in conjunction with a Newtonian fluid under the influence of magnetohydrodynamics (MHDs). Additionally, we examine the phenomena of expansion/contraction in heat and mass transfer enhancement with chemical reactions. The governing partial differential equations (PDEs) are transformed into nonlinear differential equations using the help of similarity transformation. A 4th‐order Runge–Kutta method (RK), coupled with the shooting technique, is employed as a mathematical strategy to numerically solve these nonlinear differential equations. Boosting the values of 퐾푐푟 from 2 to 10 enhances the mass transfer rate between both porous channels. Higher values of 푅푒, 푀, and 푅 lead to increasing skin friction coefficients for both porous channels. Raising the values of both NP volume fractions (φ1,φ2)${\varphi }_1,{\varphi }_2)$ from 1% to 5% results in enhanced heat transfer rates particularly for much better in platelet‐shaped NPs as compared to other shapes such as spherical, brick, and cylinder. Larger values of 훼, M, and Re cause the radial velocity profile to exhibit opposite behaviors in the middle of the wall and momentum boundary layer thickness. [ABSTRACT FROM AUTHOR]

Published
2024
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49. Significance of tri‐hybrid nanoparticles on the dynamics of Ellis rotating nanofluid with thermal stratification.

Author

Sharif, Humaira, Ali, Bagh, Saman, Iqra, Shah, Nehad Ali, and El‐Rahman, Magda Abd

Abstract

The fluids flow containing nano size particles is essential in industrial applications, especially in nuclear cooling system and nuclear reactor to increase the energy performance. In connection to this, a trihybrid Ellis rotating nanofluid flow through a stretching surface for increasing the heat transportation is presented. By suspending three different types of nano size particles the trihybrid nanofluid is formed with distinct chemical and physical connection into base liquid. In this article, the nano size particles TiO2,MgO${\mathrm{Ti}}{{{\mathrm{O}}}_{\mathrm{2}}}{\mathrm{,}}\,{\mathrm{MgO}}$, and CoFe2O4${\mathrm{CoF}}{{{\mathrm{e}}}_{\mathrm{2}}}{{{\mathrm{O}}}_{\mathrm{4}}}$ are mixed in H2O${{{\mathrm{H}}}_{\mathrm{2}}}{\mathrm{O}}$ (water). This type of mixture helps in degradation of noxious substances, cleaning environmental and many other appliances that requires the cooling effect. In addition, the linear thermal radiation is also considered. The governing equations of the flow and fluid temperature are minimized to ordinary differential equations and these equations are solved by Runge Kutta order fourth (RK45) approach. The approximate results are analyzed via graphs and the results reveal that thermal conductivity of trihybrid nano type fluid is more valuable as compared to hybrid and single nanofluid. Higher values of magnetic and rotational parameter have aggrandized the fluid temperature and opposite trend has observed for Ellis and thermal stratification parameter. Moreover, the results are compared with previous literature and found an excellent agreement. [ABSTRACT FROM AUTHOR]

Published
2024
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