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Direct Measurements of Skin Friction


Dhawan, Satish (1951) Direct Measurements of Skin Friction. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/1S03-8631.


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 turbulent 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.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Aeronautics and Mathematics)
Degree Grantor:California Institute of Technology
Division:Engineering and Applied Science
Major Option:Aeronautics
Minor Option:Mathematics
Awards:Caltech Distinguished Alumni Award, 1969
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Liepmann, Hans Wolfgang
Group:GALCIT, Caltech Distinguished Alumni Award
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1951
Record Number:CaltechETD:etd-09262002-155504
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3779
Deposited By: Imported from ETD-db
Deposited On:27 Sep 2002
Last Modified:22 Jul 2021 22:43

Thesis Files

PDF (Dhawan_s_1951.pdf) - Final Version
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