The Interaction Between the Torsional Vibration of a Circular Rod and an Adjacent Viscous Fluid

원형 봉의 비틀림 진동과 인접 점성유체의 상호작용

This paper deals with the effect of an adjacent viscous fluid on the torsional vibration of a circular rod excited by a transducer at one end. The interaction between the torsional vibration of the rod and the fluid has been studied theoretically and expressed in terms of the mechanical impedance. The theoretically-obtained trend that the mechanical impedance is proportional to the square root of the viscosity times density of the fluid has been confirmed by the impedance measurement. The paper demonstrates that a torsionally-vibrating rod can be used as a sensor measuring the viscosity of a fluid.