Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Analisys of the rarefied flow in microchannels with various geometries.
Submission Author:
Vinicius Daher , 26 , Brazil
Co-Authors:
Vinicius Daher, Ruan Ramon Penha dos Passos Pereira, Cayo Prado Fernandes Francisco
Presenter: Ruan Ramon Penha dos Passos Pereira
doi://10.26678/ABCM.COBEM2023.COB2023-1362
Abstract
The use of microelectromechanical systems (MEMS) offer great potential to meet technological requirements in miniaturized systems. For example, implementing MEMS-scale space thrusters, as well as microfluidic machines, such as micropumps and microcompressors present new challenges in manufacturing, material compatibility, and fluid dynamics modeling. Understanding flow behavior at micro and nanoscales, where the continuum hypothesis is not always applicable, is essential for the development of more efficient MEMS designs. In this paper, a Poiseuille-type flow of a rarefied gas through microchannels with three different geometries and isothermal wall conditions was investigated numerically. The simulations were performed using the Direct Numerical Simulation Monte Carlo(DSMC) technique for 3 degrees of rarefaction, with Knuden numbers (Kn) 0,027, 0,055 and 0,11 corresponding to the transitional regime, along a straight microchannel, a microchannel with 90 degrees curvature and a rounded 90 degree bend. The results obtained indicated that the inclusion of a curvature in the microchannel had a positive impact on the amount of mass transport. Also, the rounding on the curvature of the microchannel allowed an additional efficiency gain in relation to the pressure drop magnitude.
Keywords
Microfluidic, Microchannel, DSMC, Rarefied flow
