Amirkabir University of Technology Amirkabir Journal of Mechanical Engineering 2008-6032 54 9 2022 11 22 Effect of Obstacles Location and Flow Injection on the Mixing of Two-Gaseous Flow in a Microchannel Effect of Obstacles Location and Flow Injection on the Mixing of Two-Gaseous Flow in a Microchannel 2139 2156 4886 10.22060/mej.2022.21339.7431 FA Elyas Lekzian Faculty of Aerospace Engineering,, Semnan University, Semnan, Iran 0000-0001-9287-5127 Hamid Reza Farshi Fasih Faculty of Aerospace Engineering Journal Article 2022 04 23 In the present study, the direct simulation Monte Carlo method is utilized to investigate the effect of obstacles number, location, and also flow injection on the mixing in a channel with 16 μm length and 1 μm height. A mixing length is defined which is the length at which two species are mixed completely. Eight cases with different blockage ratios are considered to study the obstacle effect on the mixing. The blockage ratio shows the reduced flow cross-section due to the addition of obstacles. In All cases, CO2 and N2 gases enter the domain and are separated by a splitter plate that extends up to 1/3 of the channel. The blockage ratio increasing decreases mixing length by up to 10%. Whereas the mass flow rate decreased significantly. Flow injection into the channel is also studied. Four cases are considered: the first case is a simple channel without injection, the second case has cross injection, the third case has inverse injection, and flow is injected vertically through an obstacle in the fourth case. Mixing length is increased by 17% and 5% for cases 2 and 3, respectively. In case 4, the mixing length is decreased by 2% due to the obstacle. In the present study, the direct simulation Monte Carlo method is utilized to investigate the effect of obstacles number, location, and also flow injection on the mixing in a channel with 16 μm length and 1 μm height. A mixing length is defined which is the length at which two species are mixed completely. Eight cases with different blockage ratios are considered to study the obstacle effect on the mixing. The blockage ratio shows the reduced flow cross-section due to the addition of obstacles. In All cases, CO2 and N2 gases enter the domain and are separated by a splitter plate that extends up to 1/3 of the channel. The blockage ratio increasing decreases mixing length by up to 10%. Whereas the mass flow rate decreased significantly. Flow injection into the channel is also studied. Four cases are considered: the first case is a simple channel without injection, the second case has cross injection, the third case has inverse injection, and flow is injected vertically through an obstacle in the fourth case. Mixing length is increased by 17% and 5% for cases 2 and 3, respectively. In case 4, the mixing length is decreased by 2% due to the obstacle.

https://mej.aut.ac.ir/article_4886_8164d892d7aea8f1875df07f4d82ffd0.pdf