Effect of Obstacles Location and Flow Injection on the Mixing of Two-Gaseous Flow in a Microchannel

Document Type : Research Article

Authors

1 Faculty of Aerospace Engineering,, Semnan University, Semnan, Iran

2 Faculty of Aerospace Engineering

Abstract

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.

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References

[1] M.A. Moyet, Hossen, M. R., Ward, A., Adams, O., Mason, M. D., Collins, S. D., Smith, R. L., MEMS Micromixer for Ultra Fast Mixing of Fluids, in:  2020 IEEE 33rd International Conference on Micro Electro Mechanical Systems (MEMS), IEEE, China, 2020, pp. 1137-1140.
[2] B. Farshchian, Amirsadeghi, A., Choi, J. P., Daniel S., Namwon, P., 3D nanomolding and fluid mixing in micromixers with micro-patterned microchannel walls, Nano Convergence, 4(1) (2017) 1-10.
[3] Y. Su, Chen, G., Kenig, E. Y., An experimental study on the numbering-up of microchannels for liquid mixing, Lab on a Chip, 15(1) (2015) 179-187.
[4] I. Shah, Kim, S. W., Kim, K., Doh, Y. H., Choi, K. H., Experimental and numerical analysis of Y-shaped split and recombination micro-mixer with different mixing units, Chemical Engineering Journal, 358 (2019) 691-706.
[5] H.A. Stone, Kim, S, Microfluidics: basic issues, applications, and challenges, American Institute of Chemical Engineers. AIChE Journal, 47(6) (2001) 1250-1271.
[6] A.D. Stroock, Dertinger, Stephan KW, Ajdari, A., Mezic, I., Stone, H. A., Whitesides, G. M., Chaotic mixer for microchannels, Science, 295(5555) (2002) 647-651.
[7] S.S. Das, Tilekar, S. D., Wangikar, S. S, Patowari, P. K., Numerical and experimental study of passive fluids mixing in micro-channels of different configurations, Microsystem Technologies, 23(12) (2017) 5977-5988.
[8] C.Y. Lee, Wang, W. T., Liu, C. C., Fu, L. M., Passive mixers in microfluidic systems: A review, Chemical Engineering Journal, 288 (2016) 146-160.
[9] X. Shi, S. Huang, L. Wang, F. Li, Numerical analysis of passive micromixer with novel obstacle design, Journal of Dispersion Science and Technology, 42(3) (2021) 440-456.
[10] G. Cai, Xue, L., Zhang, H., Lin, J., A review on micromixers, Micromachines, 8(9) (2017) 274-281.
[11] X. Chen, S. Liu, Y. Chen, S. Wang, A review on species mixing in droplets using passive and active micromixers, International Journal of Environmental Analytical Chemistry, 101(3) (2021) 422-432.
[12] K. Ward, Fan, Z. H., Mixing in microfluidic devices and enhancement methods, Journal of Micromechanics and Microengineering, 25(9) (2015) 094-103.
[13] F. Yan, Farouk, B., Numerical simulation of gas flow and mixing in a microchannel using the direct simulation Monte Carlo method, Microscale thermophysical engineering, 6(3) (2002) 235-251.
[14] M. Wang, Li, Z., Gas mixing in microchannels using the direct simulation Monte Carlo method, International Journal of Heat and Mass Transfer, 49(9-10) (2006) 1696-1702.
[15] M. Le, Hassan, I, DSMC simulation of gas mixing in T-shape micromixer, Applied Thermal Engineering, 27(14-15) (2007) 2370-2377.
[16] M. Reyhanian, Croizet, Cédric, Gatignol, R, Numerical analysis of the mixing of two gases in a microchannel, Mechanics & Industry, 14(6) (2013) 453-460.
[17] M. Darbandi, , Sabouri, M., DSMC Study of Gas Mixing Enhancement in Nanoscales Using Throttling Technology, in: 5th International Conference on Nanostructures, Kish Island, 2014.
[18] M. Darbandi, Lakzian, E., Mixing enhancement of two gases in a microchannel using DSMC, in:  Applied Mechanics and Materials, Trans Tech Publ, Dubai, 2013, pp. 166-169.
[19] C.Y. Huang, Wan, S. A., Hu, Y. H., Oxygen and nitrogen gases mixing in T-type micromixers visualized and quantitatively characterized using pressure-sensitive paint, International Journal of Heat and Mass Transfer, 111 (2017) 520-531.
[20] C.Y. Huang, Hu, Y. H., Wan, S. A., Nagai, H., Application of pressure-sensitive paint for the characterization of mixing with various gases in T-type micromixers, International Journal of Heat and Mass Transfer, 156 (2020) 119-131.
[21] G. Karniadakis, Beskok, A., Aluru, N., Microflows and nanoflows: fundamentals and simulation, Springer Science & Business Media, 2006.
[22] N. Shah, Gavasane, A., Agrawal, A., Bhandarkar, U., Comparison of Various Pressure Based Boundary Conditions for Three-Dimensional Subsonic DSMC Simulation, Journal of Fluids Engineering, 140(3) (2018) 217-233.
[23] M. Wang, Z. Li, Simulations for gas flows in microgeometries using the direct simulation Monte Carlo method, International Journal of Heat and Fluid Flow, 25(6) (2004) 975-985.
[24] E. Lekzian, Ebrahimi, A, Parhizkar, H, Performance analysis of microelectromechanical thrusters using a direct simulation Monte Carlo solver, Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering, 232(7) (2018) 1212-1222.
[25] E. Roohi, Stefanov, S., Shoja-Sani, A., Ejraei, H., A generalized form of the Bernoulli Trial collision scheme in DSMC: Derivation and evaluation, Journal of Computational Physics, 354 (2018) 476-492.
[26] M. Shamseddine, Lakkis, I., A novel spatio-temporally adaptive parallel three-dimensional DSMC solver for unsteady rarefied micro/nano gas flows, Computers & Fluids, 186 (2019) 1-14.
[27] D. Bothe, C. Stemich, H.-J. Warnecke, Fluid mixing in a T-shaped micro-mixer, Chemical Engineering Science, 61(9) (2006) 2950-2958.
[28] L.T. Rao, S. Goel, S.K. Dubey, A. Javed, Performance Investigation of T-Shaped Micromixer with Different Obstacles, in:  Journal of Physics: Conference Series, IOP Publishing, 2019, pp. 12-21.
[29] C.-Y. Wu, B.-H. Lai, Numerical study of T-shaped micromixers with vortex-inducing obstacles in the inlet channels, Micromachines, 11(12) (2020) 1122.
[30] D. Gobby, P. Angeli, A. Gavriilidis, Mixing characteristics of T-type microfluidic mixers, Journal of Micromechanics and microengineering, 11(2) (2001) 126.
[31] A. Lobasov, A. Minakov, Analyzing mixing quality in a T-shaped micromixer for different fluids properties through numerical simulation, Chemical Engineering and Processing-Process Intensification, 124(4) (2018) 11-23.
[32] C.A. Roseman, Argrow, Brian M, Low-Speed DSMC Simulations of Hotwire Anemometers at High-Altitude Conditions, Fluids, 6(1) (2021) 20-32.
[33] A. Uyanwaththa, Malalasekera, W., Hargrave, G., Dubal, M., Large eddy simulation of scalar mixing in jet in a cross-flow, Journal of Engineering for Gas Turbines and Power, 141(6) (2019) 531-542.
[34] C. Priere, Gicquel, L. Y. M., Kaufmann, P., Krebs, W., Poinsot, T., Large eddy simulation predictions of mixing enhancement for jets in cross-flows, Journal of Turbulence, 5 (2004) 303-313.
[35] X. Chu, Zeng, X., Zheng, T. ,Z., Weihuang, Y., Yifan, Z., Wei, H. Y., Structural design and performance research of methanol steam reforming microchannel for hydrogen production based on mixing effect, International journal of hydrogen energy, 45(41) (2020) 0859-0874.
Amirkabir Journal of Mechanical Engineering
Volume 54, Issue 9
December 2022
Pages 2139-2156

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