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3.6.26 14:30 s.t. - Seminarroom 25.32 O2.51
Shang-Yik Reigh: „Diffusioosmotic Flows in a Microchannel”
Seoul National University, Seoul, Republic of Korea
Diffusioosmotic flow refers to fluid motion induced by concentration gradients within a microchannel. Unlike Poiseuille flow, diffusioosmotic flow is an autonomous flow generated in the absence of external driving forces. The flow originates within thin interfacial potential regions (boundary layers)-where interactions between fluid particles and channel walls are significant-thereby driving global flow in the bulk fluid. Consequently, fluid-wall molecular interactions, coupled with concentration gradients, play a crucial role in the diffusioosmotic mechanism. Furthermore, the fluid density and viscosity can vary within these thin potential regions due to molecular interactions, which can lead to significant changes in the flow velocity. In this talk, I will show that diffusioosmotic flows can indeed be autonomously generated by establishing concentration gradients together with fluid-wall molecular interactions. Using Multiparticle Collision Dynamics (MPCD), a coarse-grained particle-based simulation method, diffusioosmotic flows are investigated and quantitatively compared with predictions from continuum theory that incorporates density and viscosity variations. Based on this understanding, we have further studied a variety of many-particle systems in which both diffusioosmotic and diffusiophoretic mechanisms operate simultaneously.
References
- . V. Derjaguin, G. P. Sidorenkov, E. A. Zubashchenko, and E. V. Kiseleva, Kolloidn. Zh. 9 335 (1947)
- . L. Anderson Annu. Rev. Fluid Mech. 21 61 (1989)
- . Gil, S. Y. Reigh, and Y. Jung J. Chem. Phys. 163 134902 (2025)
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