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Study on heat transfer and fluid flow in the stand pipe rupture accident. Buoyancy driven exchange flow behavior through the broken stand pipe

Technical Report:

Abstract

This paper deals with an experimental investigation of the buoyancy driven exchange flow which takes place through a narrow cylindrical channel, during the stand pipe rupture accident in a high temperature gas-cooled reactor (HTGR). The velocity distribution through the cylindrical channel is measured by a laser Doppler velocimeter, in order to evaluate the air ingress flow rate. The experiments are performed under atmospheric pressure with nitrogen as a working fluid. Rayleigh number ranges from 1.3 x 10{sup 7} to 7.0 x 10{sup 7}. The following conclusions were obtained: (1) The laser Doppler velocimeter was found a good method for the measurement of the velocity of the exchange flow. (2) When the temperature of the hemisphere and the bottom heated plate, which simulate the top cover of the reactor, was kept uniform, the volumetric exchange flow rate agreed well with Epstein`s result. (3) The exchange flow through a narrow cylindrical channel fluctuated irregularly with time and space. (author).
Authors:
Fumizawa, Motoo; Hishida, Makoto [1] 
  1. Japan Atomic Energy Research Inst., Tokai, Ibaraki (Japan). Tokai Research Establishment
Publication Date:
Sep 01, 1991
Product Type:
Technical Report
Report Number:
JAERI-M-91-146
Reference Number:
SCA: 210300; 220900; PA: JPN-91:012158; SN: 92000659192
Resource Relation:
Other Information: PBD: Sep 1991
Subject:
21 SPECIFIC NUCLEAR REACTORS AND ASSOCIATED PLANTS; 22 GENERAL STUDIES OF NUCLEAR REACTORS; HEAT TRANSFER; GAS FLOW; RUPTURES; PIPES; HTGR TYPE REACTORS; VELOCIMETERS; FLUCTUATIONS; FLOW VISUALIZATION; NITROGEN; TEMPERATURE DEPENDENCE; LOSS OF COOLANT; FLOW RATE; 210300; 220900; POWER REACTORS, NONBREEDING, GRAPHITE MODERATED; REACTOR SAFETY
OSTI ID:
10117027
Research Organizations:
Japan Atomic Energy Research Inst., Tokyo (Japan)
Country of Origin:
Japan
Language:
Japanese
Other Identifying Numbers:
Other: ON: DE92768080; TRN: JP9112158
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
JPN
Size:
35 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Fumizawa, Motoo, and Hishida, Makoto. Study on heat transfer and fluid flow in the stand pipe rupture accident. Buoyancy driven exchange flow behavior through the broken stand pipe. Japan: N. p., 1991. Web.
Fumizawa, Motoo, & Hishida, Makoto. Study on heat transfer and fluid flow in the stand pipe rupture accident. Buoyancy driven exchange flow behavior through the broken stand pipe. Japan.
Fumizawa, Motoo, and Hishida, Makoto. 1991. "Study on heat transfer and fluid flow in the stand pipe rupture accident. Buoyancy driven exchange flow behavior through the broken stand pipe." Japan.
@misc{etde_10117027,
title = {Study on heat transfer and fluid flow in the stand pipe rupture accident. Buoyancy driven exchange flow behavior through the broken stand pipe}
author = {Fumizawa, Motoo, and Hishida, Makoto}
abstractNote = {This paper deals with an experimental investigation of the buoyancy driven exchange flow which takes place through a narrow cylindrical channel, during the stand pipe rupture accident in a high temperature gas-cooled reactor (HTGR). The velocity distribution through the cylindrical channel is measured by a laser Doppler velocimeter, in order to evaluate the air ingress flow rate. The experiments are performed under atmospheric pressure with nitrogen as a working fluid. Rayleigh number ranges from 1.3 x 10{sup 7} to 7.0 x 10{sup 7}. The following conclusions were obtained: (1) The laser Doppler velocimeter was found a good method for the measurement of the velocity of the exchange flow. (2) When the temperature of the hemisphere and the bottom heated plate, which simulate the top cover of the reactor, was kept uniform, the volumetric exchange flow rate agreed well with Epstein`s result. (3) The exchange flow through a narrow cylindrical channel fluctuated irregularly with time and space. (author).}
place = {Japan}
year = {1991}
month = {Sep}
}