Investigation of non-Newtonian behavior of dusty plasma liquid

Abstract

The paper presents experimental investigation of flow of dusty plasma medium formed by macroparticles in argon plasma. The dependences of the coefficient of shear viscosity of such liquid on the external force causing the flow of dusty plasma liquid and on the pressure of plasma-generating gas are studied. It is found that the viscosity of the dusty plasma medium decreases with increasing shear stress and increases with increasing pressure of buffer gas. An experimental investigation of the dynamics of macroparticles in an unperturbed liquid dusty plasma medium as a function of coupling parameter is performed; in so doing, formations of particles whose motion is correlated are observed in the region of high values of coupling parameter. It is assumed that the non-Newtonian pattern of dusty plasma liquid may be due to the emergence of crystal-like dusty plasma clusters in the ‘liquid’ phase. An experimental investigation of a crystalline dusty plasma structure under the effect of laser radiation is performed; in so doing, a macroscopic flow of the crystalline dusty plasma structure is observed under the effect of shear stress. The mechanism of formation and subsequent annihilation of edge misfit dislocations is observed and the threshold pattern of such flow is established; the threshold value of power of laser radiation is determined.

Breaking stress of neutron star crust

“…Its breaking stress can be measured in the laboratory as a threshold stress which is needed to obtain flow. The presence of such a threshold has been recently experimentally demonstrated by Gavrikov et al (2010).…”

Laser excitation of long-lived oscillatory states in a dusty-plasma trap

“…Earlier, we studied the effect of laser radiation on the character of volume flow of the dusty plasma fluid and, in particular, on its viscoplastic properties [23,24]. In the present work, we continue our investi gation of the dynamics of particles in a dusty plasma and consider the effect of laser radiation on the motion of a single particle in a dusty plasma sheath, which is manifested, in particular, by their self excited vertical oscillations.…”

“…One of the key tasks in investigating a dusty plasma is to study the interactions of various types (including electric [17][18][19], gasdynamic [20,21], and optical [22][23][24]) between particles and their beams [25,26] and the resulting perturbations that arise in the dusty plasma. Earlier, we studied the effect of laser radiation on the character of volume flow of the dusty plasma fluid and, in particular, on its viscoplastic properties [23,24].…”

Пороговый Характер Раскручивания Объемного Пылевого Кластера В Магнитном Поле

“…Одной из экспериментально обнаруженных особенностей ее механических свойств является проявление пороговых эффектов. Среди них известны порог возникновения течения в пылевом образовании при лазерном сдвиговом воздействии [5,6], появление собственного вращения у уединенных пылевых частиц (возникновение у них магнитных моментов) [7,8], а также масштабные эффекты (зависимость от числа частиц, размера структуры) появления вращательного движения пылевой структуры в магнитном поле [9,10].…”