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Measurement and simulation of the turbulent dispersion of a radioactive tracer in a two-phase flow system

Abstract

The turbulent dispersion of a radiotracer in an experimental setup with a natural convection liquid-gaseous flow was investigated. A liquid-gaseous bubbly flow was generated in a narrow tank by injection of pressurized air into water or by catalytic disintegration of H{sub 2}O{sub 2}. Turbulent Prandtl numbers for gas and tracer dispersion were varied. In the case of higher gas superficial velocities (J{sub gas}{approx}5-15 mm/s), a reasonable agreement was achieved between calculated and measured tracer transport velocity and dispersion coefficient values. A nearly linear correlation between j{sub gas} and D was found in agreement with other authors. The calculation results contribute to a better understanding of the phenomena and interpretation of the measurement results as well as to the validation of the CFD code for turbulent two-phase flow applications. Further investigations are necessary to improve the agreement in the cases of H{sub 2}O{sub 2} disintegration and low gas superficial velocities. (orig.)
Authors:
Publication Date:
Oct 01, 1998
Product Type:
Miscellaneous
Report Number:
FZR-238
Reference Number:
SCA: 420400; PA: DEN-99:0F8123; EDB-99:063692; SN: 99002106202
Resource Relation:
Other Information: PBD: Oct 1998; Related Information: Is Part Of Forschungszentrum Rossendorf, Institute of Safety Research. Annual report 1997; Weiss, F.P.; Rindelhardt, U. [eds.]; PB: 192 p.
Subject:
42 ENGINEERING NOT INCLUDED IN OTHER CATEGORIES; TWO-PHASE FLOW; TURBULENCE; TRACER TECHNIQUES; TOMOGRAPHY; BUBBLES; COMPUTERIZED SIMULATION; VALIDATION; DISPERSIONS; FLOW MODELS; COMPARATIVE EVALUATIONS; FLOW VISUALIZATION; VOID FRACTION; PRANDTL NUMBER
OSTI ID:
352069
Research Organizations:
Forschungszentrum Rossendorf e.V. (FZR) (Germany). Inst. fuer Sicherheitsforschung
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Other: ON: DE99750737; TRN: DE99F8123
Availability:
INIS; OSTI as DE99750737
Submitting Site:
DEN
Size:
pp. 48-56
Announcement Date:

Citation Formats

Hensel, F, and Rohde, U. Measurement and simulation of the turbulent dispersion of a radioactive tracer in a two-phase flow system. Germany: N. p., 1998. Web.
Hensel, F, & Rohde, U. Measurement and simulation of the turbulent dispersion of a radioactive tracer in a two-phase flow system. Germany.
Hensel, F, and Rohde, U. 1998. "Measurement and simulation of the turbulent dispersion of a radioactive tracer in a two-phase flow system." Germany.
@misc{etde_352069,
title = {Measurement and simulation of the turbulent dispersion of a radioactive tracer in a two-phase flow system}
author = {Hensel, F, and Rohde, U}
abstractNote = {The turbulent dispersion of a radiotracer in an experimental setup with a natural convection liquid-gaseous flow was investigated. A liquid-gaseous bubbly flow was generated in a narrow tank by injection of pressurized air into water or by catalytic disintegration of H{sub 2}O{sub 2}. Turbulent Prandtl numbers for gas and tracer dispersion were varied. In the case of higher gas superficial velocities (J{sub gas}{approx}5-15 mm/s), a reasonable agreement was achieved between calculated and measured tracer transport velocity and dispersion coefficient values. A nearly linear correlation between j{sub gas} and D was found in agreement with other authors. The calculation results contribute to a better understanding of the phenomena and interpretation of the measurement results as well as to the validation of the CFD code for turbulent two-phase flow applications. Further investigations are necessary to improve the agreement in the cases of H{sub 2}O{sub 2} disintegration and low gas superficial velocities. (orig.)}
place = {Germany}
year = {1998}
month = {Oct}
}