Caltech Library System

About | Browse | Search | Caltech Student Instructions

Type of Document	Dissertation
Author	Dhawan, Satish
URN	etd-09262002-155504
Persistent URL	http://resolver.caltech.edu/CaltechETD:etd-09262002-155504
Title	Direct measurements of skin friction
Degree	PhD
Option	Aeronautics
Advisory Committee	Advisor Name Title Hans Wolfgang Liepmann Committee Chair
Keywords	none
Date of Defense	1951-01-01
Availability	unrestricted
Abstract A device has been developed to measure local skin friction on a flat plate by measuring the force exerted upon a very small movable part of the surface of a flat plate. These forces, which range from about 1 milligram to about 100 milligrams, are measured by means of a reluctance measuring device. The apparatus was first applied to measurements in the low-speed range, both for laminar and turbulant boundary layers. The measured skin friction coefficients show excellent agreement with Blasius' and Karman's results respectively. The device was then applied to high-speed subsonic flow and the turbulent skin friction coefficients were determined up to a Mach number of about 0.8. A few measurements in supersonic floor were also made. The paper describes the design and construction of the device and the results of the measurements.
Files	Filename       Size       Approximate Download Time (Hours:Minutes:Seconds)     28.8 Modem   56K Modem   ISDN (64 Kb)   ISDN (128 Kb)   Higher-speed Access    Dhawan_s_1951.pdf 11.12 Mb 00:51:28 00:26:28 00:23:09 00:11:34 00:00:59