Measurements of Skin Friction in Channel Flow

The purpose of these experiments have been to measure the effect of passive means for affecting the skin friction in channel flow. Early measurements indicated that a semi-random distribution of chevrons with a thickness of 5 to 6 wall units could reduce the overall friction in the channel by as muc...

Full description

Saved in:
Bibliographic Details
Main Authors: Sirovich, Lawrence, Karlsson, Sture
Format: Report
Language:English
Subjects:
CHANNEL FLOW
DRAG REDUCTION
FLOW FIELDS
Fluid Mechanics
HEAT TRANSFER
SKIN FRICTION
Online Access:Request full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:The purpose of these experiments have been to measure the effect of passive means for affecting the skin friction in channel flow. Early measurements indicated that a semi-random distribution of chevrons with a thickness of 5 to 6 wall units could reduce the overall friction in the channel by as much as 12%, whereas the same type of chevrons uniformly spaced increased the channel friction by 20%. The measurements where these results were obtained were made in a portion of the channel that had not yet reached fully developed channel flow properties.