UMD Theses and Dissertations

Permanent URI for this collectionhttp://hdl.handle.net/1903/3

New submissions to the thesis/dissertation collections are added automatically as they are received from the Graduate School. Currently, the Graduate School deposits all theses and dissertations from a given semester after the official graduation date. This means that there may be up to a 4 month delay in the appearance of a given thesis/dissertation in DRUM.

More information is available at Theses and Dissertations at University of Maryland Libraries.

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Subject: search.filters.subject.Pressurized Thermal Shock

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    MIXING CHARACTERISTICS OF SINGLE-PLUME AND MULTI-PLUME HIGH PRESSURE INJECTION TESTS
    (2007-06-13) Knowles, Philip; Kiger, Kenneth T; Mechanical Engineering; Digital Repository at the University of Maryland; University of Maryland (College Park, Md.)
    The purpose of this thesis is to examine effects of multiple plumes in a Pressurized Water Reactor downcomer under scaled Pressurized Thermal Shock conditions, then assess the flow patterns and mixing compared to a single plume. Most computational and experimental studies have been performed using only single plumes; the findings of multiple plume experiments indicate that plume interaction significantly changes the flow pattern in the downcomer. A globally-induced recirculation region was created by the collective interaction of the multiple plumes in the UMD experiments, which does not occur for a single plume under similar conditions. From the evolving concentration field measurements and entrainment theory, it's argued that two merged plumes experience lower entrainment rates than a single plume. This implies the possibility of a higher thermal stress on the downcomer wall than would be inferred from single plume tests. Flow visualization was employed to examine the differences in plume behavior.