| Summary: | The unsteady stagnation point flow of hybrid nanofluid past an impermeable disk is investigated
with the presence of thermal radiation. The pair of aluminium oxide and copper with 2% of φhnf
are numerically analyzed using the existing correlations of hybrid nanofluid. The governing
model is simplified into a set of differential (similarity) equations and then, numerically solved by
employing the bvp4c solver in the Matlab software. The dual solutions are presented while the
stability analysis certifies the physical/real solution. The availability of dual solutions is detected
when the range of control parameters are 1.5 ≤ B ≤ 1 (unsteadiness decelerating parameter),
0 ≤ R ≤ 0.1 (radiation parameter) and λc ≤ λ ≤ 0.5 (velocity ratio parameter). The accession of
radiation parameter and the use of different nanofluids (Cu-H2O, Al2O3-H2O and Cu-Al2O3/H2O)
are not prolonging the boundary layer separation. However, the addition of R, B and the use of
Cu-Al2O3/H2O hybrid nanofluid enhance the thermal performance of the working fluid.
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