Application of the hydrogen-bubble technique for velocity measurements in thin liquid films.A unique adaptation of the hydrogen-bubble flow visualization method was applied to measure velocity profiles and film thicknesses of very thin films on an inclined plane wall. Data were obtained in the three flow regions for a developing falling film with an initially uniform velocity profile and thickness less than or equal to 0.1 in. The measured profiles compared more favorably with parabolic profiles in the intermediate fully developed region than in the initial developing region. However, measured film thicknesses compared favorably with a simplified solution of the integral momentum equation based on parabolic velocity profiles. The results confirm the theoretical prediction that a relatively long distance may be required even for a thin film before nonaccelerating flow with a constant film thickness is obtained and Nusselt's classical analysis applies. The experimental technique was shown to be a practical experimental method for obtaining data for the two-dimensional laminar flow of thin liquid films.
Document ID
19730050231
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Thomas, W. C.
Rice, J. C. (Virginia Polytechnic Institute and State University Blacksburg, Va., United States)
Date Acquired
August 7, 2013
Publication Date
June 1, 1973
Subject Category
Fluid Mechanics
Report/Patent Number
ASME PAPER 73-APM-8
Meeting Information
Meeting: Applied Mechanics Summer Conference
Location: Atlanta, GA
Start Date: June 20, 1973
End Date: June 22, 1973
Sponsors: American Society of Mechanical Engineers