Conjugate heat transfer in a porous cavity filled with nanofluids and heated by a triangular thick wall

► Conjugate heat transfer in a square porous cavity heated diagonally and filled with nanofluids is studied. ► Heat transfer may be enhanced or deteriorated with increasing nanoparticles volume fraction. ► The Rayleigh number and the triangular wall thickness are important factors. ► Copper nanoparticles give greater heat transfer than alumina oxide and titanium oxide.