Experimental Investigation of Dynamic Parameters of Viscous Fluids in Unsteady Flow

The main objective of this paper is to conduct a series of experimental investigations to measure the effective mass moment of inertia and damping coefficient of a viscous fluid due to an immersed rod fitted in a circular cylindrical container which experiences roll oscillations. This work is mainly oriented to the dynamic analysis of liquid propellant rockets. The measured results are used to examine the validity of the solution of the linearized Navier-Stokes equations. It is shown that the liquid inertia and damping are dependent upon the tank roll frequency and fairly agree with the predicted analytical results.