Newtonian flow over a porous stretching/shrinking sheet with CNTS and heat transfer

•An MHD flow and heat transfer of SWCNTs and MWCNTs with the impact of radiation are considered.•N-S are solved analytically and temperature equation is solved hypergeometric function.•Axial and transverse velocities increase as the parameters such as Brinkmann ratio, Reynold number increase in both SWCNTS and MWCNTs cases.•The extensive of the boundary layer increases with an increase in the mass transpiration.•For both PST and PHF cases, a positive power-index value revealed interesting and intricate heat transfer features.•Heat transfer as a result of a shrinking sheet is found to be expressively altered as of that due to a stretching sheet.•The extensive of the thermal boundary layer is reduced as the Prandtl number increases, consequently the same as the thermal radiation.