Carbon nanotubes Casson fluid Heat transfer Laplace transform technique Moving disk BOUNDARY-LAYER CNTS FIELD FREE-CONVECTION FLOW Flow of fluids Fluid flow and heat transfers Friction HEAT-TRANSFER Heat transfer rate Laplace transform techniques Laplace transforms Magnetic strength Magnetohydrodynamics Multiwalled carbon nanotubes (MWCN) Nanofluidics Nanotubes Numerical values PLATE POROUS-MEDIUM Porosity Porosity effect Porous materials STATE-SPACE APPROACH Single-walled carbon nanotubes (SWCN) Skin friction