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The heat diffusion in the cylindrical film stream of the second-grade cross nanofluid is examined numerically. In this study, solid nanoparticles of the aluminum alloys AA7072 and AA7075 are submerged in water as the base liquid. A consistent magnetic field is effective to the stream along with the nonlinear radiation, Ohmic heating, and Catteneo–Christov heat flux to inspect base fluid and composite nanofluids’ stream and thermal transport properties. The flow model is created and solved mathematically utilizing the bvp5c MATLAB scheme. Comparable outcomes for water and composite nanofluids have been delivered and explored. The present research focuses on using solar energy with parabolic trough solar collectors (PTSC). It is discovered that the thermal diffusion rate of the AA7072-AA7075-water combination is more remarkable than the base liquid. The external magnetic field's drag force can be used to moderate the flow and thermal areas. Also, radiative heat contributes to boosting the thermal transport rate of composite nanofluid without impacting the wall resistance. Therefore, AA7072-AA7075-water pumping through PTSC will help to improve heat diffusion to a higher level. The findings are original and aid in understanding how well hybrid nanomaterials function in a second-grade non-Newtonian liquid. The information from this study about the elements that contribute to the working fluid's thermal improvement is also helpful to researchers in this field and a broad audience from industries.

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A numerical examination is accomplished to explore the thermal transmission in the cylindrical film flow of Casson–Williamson hybrid nano liquids. This work incorporates water as a base fluid embedded with aluminum oxide (Al2O3) and copper oxide (CuO), two forms of solid nanoparticles. A consistent magnetic field is applied along a radial path in the presence of Ohmic heating, thermal radiation and Catteneo–Christov thermal flux to examine Williamson and Casson hybrid nano liquids’ flow and heat transmission characteristics. The flow model is developed and resolved numerically using the bvp5c Matlab software. A relative outcome for Casson and Williamson cross nano liquids is obtained and discussed. The current study is on solar energy application to parabolic trough solar collectors. It is found that the heat spread rate of Casson cross nano liquid is more advanced than Williamson hybrid nano liquid. The flow and heat regions can be controlled by the drag force produced by the external magnetic field.

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