On the location and mechanisms of dryout in top-fed and bottomfed particulate beds

Journal Article · Sun Apr 01 04:00:00 EST 1984 · Nucl. Technol.; (United States)

OSTI ID:5342531

Hofmann, G

Dryout experiments with inductively heated particulate beds and water were performed. The beds were up to 0.5 m deep and consisted of 3-mm particles. For bottom-fed conditions, the liquid was driven by natural convection from a downcomer annulus and entered the bed through a permeable base. Dryout started near the top of the bed, and the dryout heat flux was more than twice as high as in a comparable top-fed bed. For top-fed conditions, the base of the bed was impermeable. In this case, the elevation of incipient dryout depended on the heat flux. The appearance of the first dry spot was found to be preceded by a remarkable decrease of the liquid inventory in the bed, which delayed dryout and which is interpreted as a boil-off transient of reservoir liquid in the bed. A proposed model for predicting the dryout elevation that is based on the observed dryout mechanism is in qualitative agreement with the experimental data.

• Research Organization: Kernforschungszentrum Karlsruhe Institut fur Reaktorbauelemente, Karlsruhe,
• OSTI ID: 5342531
• Journal Information: Nucl. Technol.; (United States), Journal Name: Nucl. Technol.; (United States) Vol. 65:1; ISSN NUTYB
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220100* -- Nuclear Reactor Technology-- Theory & Calculation
CONVECTION
DRYOUT
ENERGY TRANSFER
FLUID MECHANICS
HEAT FLUX
HEAT TRANSFER
HOT SPOTS
HYDRAULICS
MASS TRANSFER
MATHEMATICAL MODELS
MECHANICS
NATURAL CONVECTION
PARTICLES
PARTICULATES
PERMEABILITY
TEMPERATURE DEPENDENCE