Heat transfer enhancement of laminar impinging slot jets by nanofluids and metal foams

•Confined impinging slot jets in metal foams and nanofluids are numerically studied.•The heated wall is at assigned temperature and buoyancy effects are considered.•Metal foams in local thermal non-equilibrium and single-phase nanofluids are assumed.•The convective heat transfer increased with the Peclet number increase.•The heat transfer coefficient shows different behavior varying the porosity.