Impact of Shape-Dependent Hybrid Nanofluid on Transient Efficiency of a Fully Wet Porous Longitudinal Fin

In the article, transient heat transfer characteristics of a convective–radiative longitudinal fin fully wetted in a hybrid nanofluid have been analysed. The fin medium is porous, and Darcy law has been implemented to formulate the fluid–solid interactions. The hybrid nanofluid is obtained by immersing MoS 2 and Ag nanoparticles in the hybrid base fluid C 2 H 6 O 2 - H 2 O , and the study is based on a fractional approach. Further, three different shapes, namely brick, blade, and lamina, have been selected for the investigation. The scrutiny presented in dimensionless form is a nonlinear partial differential equation which is solved by employing the implicit finite difference method. The effect of shape factor, nanoparticle volume fraction, dimensionless time, wet porous parameter, and other relevant parameters on the thermal field and efficiency of the fin structure has been graphically analysed and discussed. The examination has resulted in a novel outcome that the presence of hybrid nanofluid enhances the fin efficiency and also the highest fin efficiency is achieved in the presence of lamina-shaped nanoparticles. The findings of the investigation play a prominent role in the heat transfer enhancement of industrial processes.