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Visual Measurement Technique for Analysis of Nucleate Flow Boiling.


pdf icon Visual Measurement Technique for Analysis of Nucleate Flow Boiling. (4011 K)
Kedzierski, M. A.; Crowder, J. M.; Jacobi, A. M.; Zhang, L.

NISTIR 5519; 96 p. October 1994.

Available from:

National Technical Information Service
Order number: PB95-143301

Keywords:

bubbles; boiling; visualization technique; digital image analysis; alternative refrigerants

Abstract:

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.