The effects of shape of barriers on normal distribution of fluid within different regions of microchannels using molecular dynamics simulation

Abstract

In this work, molecular dynamics simulation of boiling flow of argon fluid is presented inside microchannels with ideal and roughened surfaces. In the first step, fluid flow is simulated inside ideal microchannels. Then, roughness elements with cone, cubic, and spherical shapes are simulated on the surfaces ofideal microchannels. Boundary conditions are unique to get comparable results in density, velocity, and temperature profiles. Results of density profiles are reported at four-time steps of 250000, 500000, 750000, and 1000000, respectively. Next, velocity and temperature profiles are presented at 1000000-time steps. It was reported that density distribution in the 300 layers in the center of a microchannel with cubic barriers commences at initial time steps while other microchannels begin in higher time steps. But, with the progress of boiling flow, central layers of a rough microchannel with cubic barriers have lower density values than those of other microchannels. On the other side, quantitative results indicate that density differences in the central regions of microchannels are compensated with increasing time steps. Therefore, it is concluded that the shape of barriers is important and reasonable to bother normal distribution of atoms within different regions of microchannels.