Visual Measurement Technique for Analysis of Nucleate Flow Boiling.
Visual Measurement Technique for Analysis of Nucleate
Kedzierski, M. A.; Crowder, J. M.; Jacobi, A. M.; Zhang,
NISTIR 5519; 96 p. October 1994.
Available from: National Technical Information Service
Order number: PB95-143301
bubbles; boiling; visualization technique; digital image
analysis; alternative refrigerants
This report records a visual measurement technique for
analyzing bubbles formed by nucleate flow boiling. The
purpose of measuring these bubbles is to expand
understanding the boiling process. By studying the
behavior of these vapor bubbles, a better understanding
of the physics controlling boiling heat transfer will be
gained. The boiling of refrigerants is simultaneously
filmed with a high speed 16 mm camera while heat
transfer measurements are taken. These tests are
performed over a range of heat fluxes and flow
velocities to study the effect of these conditions on
the bubble dynamics. Analysis of the 16 mm films
evolved from a manual to a computer-assisted system, and
finally to a digital image analysis system. The
following is an overview of the filming apparatus and
the bubble measurement schemes.