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International Heat Transfer Conference 6

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

TEMPERATURE DISTRIBUTION IN A STEAM GENERATING TUBE WITH A RIBBON-LIKE DRY-OUT PATCH

L.B. Kapp
Marchwood Engineering Laboratories, CEGB, Southampton, England

A.C. Robinson
Marchwood Engineering Laboratories, CEGB, Southampton, England

B. Chojnowski
Central Electricity Generating Board Technology Planning and Research Division Marchwood Engineering Laboratories Marchwood, Southampton, UK

B. Scruton
Nuclear Electric Division of CEGB Marchwood Engineering Laboratories, Southampton, UK

J. Horrocks
Central Electricity Research Laboratories, CEGB, Leatherhead, England

DOI: 10.1615/IHTC6.1830
pages 351-354

Abstract

A method is described for calculating the temperature distribution in the wall of a thick wall steam generating tube with a partial dryout patch. A perfectly lagged, resistance heated tube is considered, in which the internal flow is stratified with vapour phase of uniform and constant angular width next to the wall.

Poisson's equation is solved by expansion in eigen-functions in the co-ordinates г, ø. The expansion coefficients are then found by solving a system of simultaneous equations.

The computer program is written for the IBM370 system and provides a complete temperature distribution in the tube wall. This provides for thermocouple diagnosis of flow conditions and could also be of use in stress studies.

Results agree closely with those from a finite difference program, but computing costs are very much less.

An Appendix describes an approximate analytical method devised by Scruton and Horrocks to cover the same conditions, and gives a comparison of the results.

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