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On the Added Mass of a Sphere in a Circular Cylinder Considering Real Fluid Effects


Mellsen, Stanley Brun (1966) On the Added Mass of a Sphere in a Circular Cylinder Considering Real Fluid Effects. Engineer's thesis, California Institute of Technology. doi:10.7907/63N8-1N50.


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 ideal 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.

Item Type:Thesis (Engineer's thesis)
Subject Keywords:(Mechanical Engineering)
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Mechanical Engineering
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Ellis, Albert T. (advisor)
  • Acosta, Allan J. (advisor)
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1966
Funding AgencyGrant Number
Record Number:CaltechTHESIS:10052015-161503645
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:9202
Deposited On:06 Oct 2015 17:39
Last Modified:05 Mar 2024 22:27

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