기계공학부 구성원들의 많은 관심과 참여 부탁드립니다.

▣ 주 제:  When fluid mechanics meets rheology and electrokinetics

▣ 연 사:  Prof. Jae Sung Park

▣ 소 속:  University of Nebraska-Lincoln

▣ 일 시:  2024. 9. 10.(Tue) 15:00

▣ 장 소:  제4공학관 D602호

▣ 초 청:  이준상 교수

▣ 초 록

This talk will start by introducing diverse fluid-mechanics projects conducted in the Park research group at Nebraska, including complex fluids, laminar-to-turbulent transition, and turbulent drag reduction. I will then focus on complex fluids, where a concentrated suspension of highly conductive particles in an electric field is studied. The dynamics and rheology of such suspension become more complex as fluid mechanics is coupled with nonlinear electrokinetics. In particular, I will present our intriguing findings at high concentrations, which could be useful for many applications, especially suspension-based flow batteries and desalination processes. The intriguing findings include enhanced hydrodynamics diffusion and negative particle pressure. The shear viscosity of such suspensions is then examined, where the shear thickening starts to arise at a concentration of 30%. Lastly, we examine the influence of the magnitude, direction, and frequency of the electric field as a means of active rheology control