유동 채널 내장 공진구조 기반 점도 센서 내부의 유동 특성 분석

In the present study, the flow characteristics and energy transport inside a viscometer using a suspended microchannel resonator (SMR) were analyzed. Using the approaches of direct numerical simulation and the arbitrary Lagrangian-Eulerian method, the assumptions of Sader et al. (2010, JFM) for their analytic solution were verified. From energy balance based on the integrated energy equations, the energy transfer inside a SMR was analyzed and generation of the critical points of the quality factor was explained. The viscosity and relative velocity gradient affect energy dissipation in the on-axis cases, and the quality factor decreases due to additional pumping effect in the off-axis cases. It was found that acceleration of the SMR motion has a significant effect on the temporal variation of the dissipation. Finally, the effects of the design parameters on the range of the measurable viscosity were investigated based on the flow characteristics.