Electrokinetic energy conversion of electro-magneto-hydro-dynamic nanofluids through a microannulus under the time-periodic excitation

Abstract In this work, the effects of externally applied axial pressure gradients and transverse magnetic fields on electrokinetic energy conversion (EKEC) efficiency streaming potential nanofluids through a microannulus are studied. The analytical solution for electro-magneto-hydro-dynamic (EMHD) flow is obtained under condition Debye-Hückel linearization. Especially, Green’s function method used to obtain solutions velocity field. result shows that distribution characterized by dimensionless frequency Ω, Hartmann number Ha , volume fraction nanoparticles φ geometric radius ratio wall ζ b . Moreover, three kinds periodic excitations compared discussed. results also show excitation square waveform more effective in increasing EKEC efficiency. It worth noting adjusting can affect