Abstract
The natural convection heat transfer of hybrid nanofluids over a vertical plate embedded in a saturated Darcy porous medium is analytically investigated. The base partial differential equations were reduced to a set of high-order nonlinear differential equations by using appropriate similarity variables. A new analytical solution based on the power series-transformation method is presented, and the effect of the presence of hybrid nanoparticles in the form of nondimensional parameters is investigated.