Accession Number : AD0636438

Title :   ON THE ADDED MASS OF A SPHERE IN A CIRCULAR CYLINDER CONSIDERING REAL FLUID EFFECTS.

Corporate Author : CALIFORNIA INST OF TECH PASADENA HYDRODYNAMICS LAB

Personal Author(s) : Mellsen , Stanley B. ; Ellis,Albert T. ; Waugh,John G.

Report Date : MAR 1966

Pagination or Media Count : 137

Abstract : An experimental method combined with boundary layer theory is given for evaluating the added mass of a sphere moving along the axis of a circular cylinder filled with water or oil. The real fluid effects are separated from idela fluid effects. The experimental method consists essentially of a magnetic steel sphere propelled from rest by an electromagnetic coil in which the current is accurately controlled so that it only supplies force for a short time interval which is within the laminar flow regime of the fluid. The motion of the sphere as a function of time is recorded on single frame photographs using a short-arc multiple flash lamp with accurately controlled time intervals between flashes. A concept of the effect of boundary layer displacement on the fluid flow around a sphere is introduced to evaluate the real fluid effects on the added mass. Surprisingly accurate agreement between experiment and theory is achieved. (Author)

Descriptors :   (*DRAG, *SPHERES), FLUIDS, CYLINDRICAL BODIES, ELECTROMAGNETISM, MOTION

Subject Categories : Fluid Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE