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Numerical Analysis of Two-Phase Flow in Inclined Channel with Downward- Facing Heated Wall

Numerical Analysis of Two-Phase Flow in Inclined Channel wit...

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The Fifth China-Korea Workshop on Nuclear Reactor Thermal Hydraulics

作者： Hae-Kyun Park Wan-Sik Yeon Kwang-Hyun Bang jungsoo suh Yong Soo Kim Department of Mechanical and Energy Systems Engineering Korea Maritime University 1 Dongsam-dong Yeongdo-gu Busan 606-791 S.Korea Advanced Power Plant Development Office KHNP Central Research Institute Korea Hydro & Nuclear Power Co.25-1 Jang-dong Yuseong-gu Daejeon 305-343 S.Korea

Wall boiling and bubble population balance equations combined with a two-fluid model are employed to predict boiling two-phase flow in an inclined channel with downward- facing heated wall. For vertical flow, these models have been highlighted by the mechanistic formulation of bubble nucleation on a vertical heated wall by the bubble sliding and lift-off formulations. For downward-facing heated wall in an inclined channel, however, the bubble nucleation and departure behaviors are affected by the large bubbles near the heated wall as vapor accumulates near the upper wall of the inclined channel. In order to observe the boiling behavior on the inclined, downward-facing heated wall, a visualization experiment was carried out with a 100 mm x 100 mm of the cross section, one meter long rectangular channel, inclined by 10 o from the horizontal plane. The size of the heated wall was 50 mm by 750 mm and the heat flux was provided by the Joule heating of the heated wall using the DC electrical current. High speed video images showed the bubble nucleation and growth, sweeping of these bubbles by a large bubble sliding near the wall. For these circumstances of wall boiling and two-phase flow in the inclined channel, the existing wall boiling model encompassing bubble growth and sliding were modified by considering the influence of large bubbles near the heated wall. Using the model developed, boiling two-phase flow in a 3 m long, inclined channel with downward-facing heated wall was analyzed.

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