Year: 2017
Type: article
Abstract: Electroconvective flows of nonuniformly heated poorly conducting fluid are studied. Fluid is placed in harmonic alternating electric field of horizontal capacitor heating from below. We consider the situation, when electroconductive mechanism makes the main contribution. Electroconductive charge formation mechanism associates with the dependence of the electrical conductivity on the fluid temperature. A system of eight nonlinear differential equations describing electroconvection is obtained using the Bubnov–Galerkin method with a small number of basic functions. The integration of the system is carried out using the fourth order Runge–Kutta–Merson method. As a result, nonlinear properties of various flow regimes and heat transfer through the capacitor are analyzed. A map of the electroconvection regimes of poorly conducting fluid is plotted on the parameter plane “period – the amplitude of the external field”. The evolution of emerging flows in the supercritical region for eigenfrequency of the system is analyzed. The dependence of the convective flows intensity on the dimensionless electric parameter is obtained. Time dependence of the harmonics amplitudes of the stream function is built. Isolines of perturbation of the charge density, temperature, stream function are obtained for several values of the electrical parameter. The different types of electroconvection oscillation regime are discovered. The coexistence regions of perturbations with different heat flow values are found.Received 19.01.2017; accepted 11.05.2017
Author: Natalya Kartavykh
Institution: Perm State University
Language: Russian
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2770165232