A mathematical model is presented for unsteady free convective flow and heat transfer of a viscous nanofluid from a moving vertical cylinder in the presence of thermal radiation. A range of nanofluids containing nanoparticles of Al2O3, Cu, TiO2 and Ag with nanoparticle volume fraction range less than or equal to 0.04 are considered. The governing partial differential equations with the corresponding initial and boundary conditions are solved numerically by a robust, well-tested, implicit finite difference scheme of Crank–Nicolson type, which is efficient, unconditionally stable and convergent. The obtained results are benchmarked with previously published work for special cases of the problem in order to access the accuracy of the numerical method and found to be in excellent agreement. The influence of significant parameters such as nanoparticle volume fraction, nanofluid type, thermal conduction–radiation parameter and thermal Grashof number on the flow and heat transfer characteristics is discussed. This study is relevant to high-temperature nanofluid materials’ processing, chemical engineering coating operations exploiting nanomaterials and so on.
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