Experimental Investigation on Intermittent Gas-liquid Two-phase Flow Approaching Tube Bundle
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Abstract
In an intermittent gas-liquid two-phase flow, liquid slugs are generated and flowing and those can cause flow-induced vibration when acting on a structure such as tube bundle. For example, there are some locations in a steam generator where the secondary side steam-water two-phase flow is flowing as such an intermittent flow.
This study focuses on the intermittent gas-liquid two-phase flow approaching tube bundle. Air-water twophase flow experiment was conducted. In this separate effect test, vertical upward two-phase flow approaches the horizontal square array tube bundle and intermittent liquid slugs are generated in large fluid space upstream of the bundle.
In a low void fraction flow with the void fraction approximately from 40% to 70%, those non-homogeneous or intermittent impact forces are considered to play an important role, in evaluating the flow-induced vibration of the tubes.
The two-phase flow behaviors flowing into the tube bundle were visualized. It was observed that gas slugs and liquid slugs colliding intermittently to the first row of horizontal tube bundle. Void fraction, interfacial velocity and liquid chord length distribution were measured using bi-optical probes, upstream of the tube bundle and adjacent locations to the first row of the tube bundle.