Mixed convective flow of Casson magneto-trihybrid nanofluid with Cattaneo–Christov heat fluxing and Ohmic heating: Applying pseudo-spectral collocation method

This study focuses on examining the magnetized bioconvection flow of Casson ternary nanofluid. The mathematical modeling is developed considering Cattaneo–Christov double diffusion (CCDD), Joule heating, and viscous dissipative effects. The Cattaneo–Christov heat flux model is employed to account for finite thermal relaxation time, which addresses limitations of the conventional Fourier’s law by capturing non-instantaneous heat propagation and magnetic responsive boundary conditions considered. The transformation of the governing equations is done using a group of similarity variables. The reduced nonlinear differential equations flow model is numerically solved using the pseudo-spectral collocating integration method. MAPLE develops a graphical illustration of the involved flow parameters. The obtained outcomes are validated by comparing them to recent investigations in the same field. The most important outcome of the work is that growing the Casson variable improves microorganism fluxing at the wall, whereas increasing the mixed convective parameter decreases it. As the thermal relaxation coefficient grows, the Nusselt numbers fall. Conversely, as the thermophoretic parameter increases, the Nusselt number improves. The Brownian diffusion factor and chemical reactive rate reduce the Sherwood numbers and mass transference in a hybrid ternary nanofluid. The findings provide critical insights into optimizing heat transfer mechanisms in industrial cooling, microfluidic devices, and energy storage systems, where precise control over fluid properties and heat flux is essential.