Fluid simulation of the sheath formation in a multi-component plasma containing charged dust nanoparticles

Numerical simulations of the multi-fluid equations are utilized to study the sheath structure in an acetylene plasma consists of electrons, different species of positive and negative ions, and charged nanosize dust particles. It is found that in the presence of negative ions spatially periodic fluctuations are developed in the profiles of the plasma and dust parameters. The fluctuations are enhanced with increasing the electronegativity, ion Mach number and neutral number density, while they are suppressed with increasing the dust Mach number. As the electronegativity increases, the incident dust flux on the wall decreases, whereas the positive ion flux increases. The sheath width is a descending function of the electronegativity, plasma number density, ion Mach number, and dust radius but increases monotonically with the neutral number density. - Highlights: • Numerical simulations of an acetylene sheath show spatial fluctuations in all plasma profiles. • The fluctuations are enhanced with increasing of the electronegativity α. • The incident dust flux decreases when α is increased. • The sheath width is a descending function of α, but increases with the dust radius