Boiling Heat Transfer in a Narrow Eccentric Annulus, Part I: Dryout

[+] Author and Article Information
B. S. Johnston, A. Sharon, Y. Kozawa, S. G. Bankoff

Department of Chemical Engineering, Northwestern University, Evanston, Ill. 60201

J. Eng. Power 105(4), 742-747 (Oct 01, 1983) (6 pages) doi:10.1115/1.3227476 History: Received July 27, 1982; Online September 28, 2009


An experimental apparatus was used to simulate the annular crevice formed by a heated tube and drilled tube support plate (TSP) in a pressurized water reactor recirculating steam generator. The aim of the experiment was to explore the conditions required for the formation and maintenance of a dry region. Water at 0.69 MPa or atmospheric pressure was circulated through the crevice. Visual observations and tube wall temperature measurements were obtained and compared to synthesize a description of the crevice boiling processes. It was determiend that a stable dry patch exists about a line of contact between tube and TSP above a wall superheat of 2–3°C. However, separating the tube and TSP by about 0.025 mm allows the dry patch to be rewet.

Copyright © 1983 by ASME
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