AN ANALYSIS OF THE EFFECT OF A POLYMER ADDITIVE ON TURBULENT WALL FRICTION AND PRESSURE FLUCTUATIONS,
Abstract
The analysis first shows that flat plate drag reduction by polymers is also due merely to the thickening of the sublayer. Even though the plate friction decrease can be very large, the study then shows that the turbulent wall pressure is almost unaffected by the presence of the additive. The calculations of flow noise reveal that the additive has much the same effect as a favorable pressure gradient in Newtonian flow, namely, almost no change in mean pressure level but a small increase in the convection speed and the longitudinal correlation length. Tables and graphs show the estimated effect of various polymers on both friction and turbulent wall pressure. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 29, 1967
- Accession Number
- AD0666818
Entities
People
- Frank M. White
Organizations
- Navy Underwater Sound Laboratory