Method for measuring the pore size of enhanced tubes

Details Method for measuring the pore size of enhanced tubes Method for measuring the pore size of enhanced tubes

1987-02-24

1988-02-16

Goldberg, Howard N.

Metal working

Means to assemble or disassemble

Puller or pusher means, contained force multiplying operator

29407, B23Q 1700

Patent

active

047245913

ABSTRACT:
A method of determining the average size of a plurality of pores on the external surface of an enhanced tube having subsurface channels connecting adjacent pores. A pressure measurement apparatus is positioned on a portion of the enhanced tube surface and regulated air supply pressure is blown into the pressure measurement apparatus whereby a portion of the air pressure escapes through the pores and subsurface channels. Accordingly, the difference between the supply pressure and the pressure lost across the pores and subsurface channels is a measurement of the pore size which correlates to the boiling heat transfer coefficient of the tube.

REFERENCES:
patent: 3863492 (1975-02-01), Trask, II
John and Haberman, Introduction to Fluid Mechanics, 2nd ed., Prentice Hall, Englwood Cliffs, NJ, 1971, p. 82.
Holman, Heat Transfer, 4th ed., McGraw Hill, New York, New York, 1976, p. 369.

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