Terahertz wave propagation in a fluid-conveying single-walled carbon nanotube with initial stress subjected to temperature and magnetic fields

This paper studies terahertz wave propagation in a fluid-conveying single-walled carbon nanotube (SWCNT) under temperature and magnetic fields. The SWCNT is modelled as a Timoshenko beam based on the theory of nonlocal elasticity, where the nanoscale effects are only included in bending moment and shear force through a nonlocal parameter. The governing equations of motion are derived based on nonlocal Timoshenko beam theory. A wave analysis is carried out to get the equations of the dispersion characteristics of wave propagation. Numerical results confirm the validity of the present model by comparing the results in reduced cases with those reported in the published literature. The dispersion curves of wave propagation show that the initial stress plays a very important role on the shear and flexural frequencies of a fluid-conveying SWCNT. Meanwhile, the influences of the nonlocal parameter, fluid velocity, flow density, temperature change and magnetic field on the critical stress of a fluid-conveying SWCNT are discussed. This study may be useful for the design of smart nanodevices for the delivery of drugs to cells, carrying gases, and other applications of nanobeam devices.