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Water jet intrusion into hot melt concomitant with direct-contact boiling of water

Abstract

Boiling of water poured on surface of high-temperature melt (molten metal or metal oxide) provides an efficient means for heat exchange or cooling of melt. The heat transfer surface area can be extended by forcing water into melt. Objectives of the present study are to elucidate key factors of the thermal and hydrodynamic interactions for the water jet injection into melt (Coolant Injection mode). Proposed applications include in in-vessel heat exchangers for liquid metal reactor and emergency measures for cooling of molten core debris in severe accidents of light water reactor. Water penetration into melt may occurs also as a result of fuel-coolant interaction (FCI) in modes other than CI, it is anticipated that the present study contributes to understand the fundamental mechanism of the FCI process. The previous works have been limited on understanding the melt-water interaction phenomena in the water-injection mode because of difficulty in experimental measurement where boiling occurs in opaque invisible hot melt unlike the melt-injection mode. We conducted visualization and measurement of melt-water-vapor multiphase flow phenomena by using a high-frame-rate neutron radiography technique and newly-developed probes. Although limited knowledge, however, has been gained even such an approach, the experimental data were analyzed deeply by comparing  More>>
Authors:
Sibamoto, Yasuteru [1] 
  1. Japan Atomic Energy Research Inst., Tokai Research Establishment, Tokai, Ibaraki (Japan)
Publication Date:
Aug 01, 2005
Product Type:
Technical Report
Report Number:
JAERI-Research-2005-016
Resource Relation:
Other Information: 75 refs., 59 figs., 7 tabs
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; BOUNDARY ELEMENT METHOD; FLOW VISUALIZATION; FUEL-COOLANT INTERACTIONS; HEAT TRANSFER; HYDRODYNAMICS; JETS; MELTDOWN; MOLTEN METAL-WATER REACTIONS; MULTIPHASE FLOW; NEUTRON RADIOGRAPHY; PRESSURE MEASUREMENT; PROBES; REACTOR COOLING SYSTEMS; SURFACES; WATER CHEMISTRY
OSTI ID:
20687481
Research Organizations:
Japan Atomic Energy Research Inst., Kashiwa, Chiba (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
TRN: JP0550411005866
Availability:
Available from INIS in electronic form; Also available from JAEA; URL: http://jolisf.tokai-sc.jaea.go.jp/pdf/tec/JAERI-Research-2005-016.pdf
Submitting Site:
INIS
Size:
143 pages
Announcement Date:
Mar 09, 2006

Citation Formats

Sibamoto, Yasuteru. Water jet intrusion into hot melt concomitant with direct-contact boiling of water. Japan: N. p., 2005. Web.
Sibamoto, Yasuteru. Water jet intrusion into hot melt concomitant with direct-contact boiling of water. Japan.
Sibamoto, Yasuteru. 2005. "Water jet intrusion into hot melt concomitant with direct-contact boiling of water." Japan.
@misc{etde_20687481,
title = {Water jet intrusion into hot melt concomitant with direct-contact boiling of water}
author = {Sibamoto, Yasuteru}
abstractNote = {Boiling of water poured on surface of high-temperature melt (molten metal or metal oxide) provides an efficient means for heat exchange or cooling of melt. The heat transfer surface area can be extended by forcing water into melt. Objectives of the present study are to elucidate key factors of the thermal and hydrodynamic interactions for the water jet injection into melt (Coolant Injection mode). Proposed applications include in in-vessel heat exchangers for liquid metal reactor and emergency measures for cooling of molten core debris in severe accidents of light water reactor. Water penetration into melt may occurs also as a result of fuel-coolant interaction (FCI) in modes other than CI, it is anticipated that the present study contributes to understand the fundamental mechanism of the FCI process. The previous works have been limited on understanding the melt-water interaction phenomena in the water-injection mode because of difficulty in experimental measurement where boiling occurs in opaque invisible hot melt unlike the melt-injection mode. We conducted visualization and measurement of melt-water-vapor multiphase flow phenomena by using a high-frame-rate neutron radiography technique and newly-developed probes. Although limited knowledge, however, has been gained even such an approach, the experimental data were analyzed deeply by comparing with the knowledge obtained from relevant matters. As a result, we succeeded in revealing several key phenomena and validity in the conditions under which stable heat transfer is established. Moreover, a non-intrusive technique for measurement of the velocity and pressure fields adjacent to a moving free surface is developed. The technique is based on the measurement of fluid surface profile, which is useful for elucidation of flow mechanism accompanied by a free surface like the present phenomena. (author)}
place = {Japan}
year = {2005}
month = {Aug}
}