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International Heat Transfer Conference 6

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

EXPERIMENTAL INVESTIGATION OF THE ALTERNATE DRY AND REWET (ADR) ON HEATED TUBES WITH AND WITHOUT AN OBSTRUCTION IN FLOW BOILING

Kotohiko Sekoguchi
Kyushu University, Fukuoka, Japan

O. Tanaka
Kyushu University, Fukuoka, Japan

T. Furukawa
Sasebo Technical College, Nagasaki, Japan

S. Esaki
Kyushu University, Fukuoka, Japan

T. Fukano
Dept. of Environmental Symbiosis Engineering, Kurume Institute of Technology, Fukuoka, Japan

DOI: 10.1615/IHTC6.1840
pages 355-360

Abstract

An investigation was made into the effects of a flow obstruction on the alternate dry and rewet process of the heated tube in the evaporating steam-water two-phase flow system. The experiments were performed using the vertical concentric double tubes consiting of an inner stainless steel tube (heater) and an outer glass tube, through which flow patterns and dry patches were observed.

The results for both the test sections with and without an obstruction show that the dry and rewet process strongly depends upon the inlet water velocity and the flow pattern. In particular it was revealed that the alternate dry and rewet caused in front of flow obstruction are closely related to the heat flux and the residence time of vapor slug.

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