Accession Number:

ADA027597

Title:

A Note on the Inhibition of Cavitation in Dilute Polymer Solutions.

Descriptive Note:

Technical memo.,

Corporate Author:

PENNSYLVANIA STATE UNIV UNIVERSITY PARK APPLIED RESEARCH LAB

Personal Author(s):

• Arndt,R. E. A.
• Billet,M. L.
• Holl,J. W.
• Baker,C. B.

Report Date:

1975-11-13

Pagination or Media Count:

15.0

Abstract:

Cavitation inception was investigated on a series of hemispherical nosed bodies rangine in diameter from 6.3 mm 14 inch to 203.2 mm 8 inches in both pure water and dilute aqueous polymer solutions. The desinent value of cavitation index is reduced by as much as 50 on the smaller bodies but the polymer effect is almost negligible on the largest body. There is strong evidence that the favorable effect of polymer addition is due to a reorientation of the flow field near a laminar separation bubble. It is further noted that the effect is probably limited to Reynolds numbers typical of laboratory experiments and would not exist at full scale conditions.

Descriptors:

• *POLYMERS
• *HEMISPHERES
• *NOSES
• *CAVITATION
• ORIENTATION(DIRECTION)
• FLOW FIELDS
• ADDITIVES
• SEPARATION
• INHIBITION
• LAMINAR FLOW
• WATER TUNNELS
• DRAG REDUCTION

Subject Categories:

• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE