APPLICATION OF THE METHOD OF NUMERICAL SIMULATION OF THE THREE-DIMENSIONAL FLOW OF THE WORKING MEDIUM TO ASSESS THE ISOKINETICITY OF SAMPLING IN ARMS SYSTEMS
Journal: ANRI
№ 2
, 2025
Rubrics: SCIENTIFIC ARTICLE
Authors:
1.
Nuclear Safety Institute of the Russian Academy of Science
(Senior Research Fellow)
Russian Federation
Russian Federation
2.
Nuclear Safety Institute of the Russian Academy of Sciences (IBRAE RAN)
3.
Nuclear Safety Institute of the Russian Academy of Sciences (IBRAE RAN)
4.
SPC «Doza», Ltd
(Lead Engineer)
Russian Federation
Russian Federation
5.
SPC «Doza», Ltd
(director of department)
Russian Federation
Russian Federation
Type:
Article
Pages:
from 65
to 71
Status:
Published
Received:
16.06.2025
Accepted:
16.06.2025
Published:
16.06.2025
Subject area:
UDC 539.16.07
UDC 519.6
UDC 519.6
Language:
Russian
Keywords:
ARMS, sampling, sampling probe, isokineticity
Abstract (English):
To assess the isokineticity of sampling using a slot-type probe, the method of numerical modeling of the spatial flow of the working media was used. A three-dimensional digital model of the work area, including a sampling probe, was created. Based on the analysis of the flow conditions, concentration and size of aerosol particles, an appropriate mathematical model was formulated, considering the turbulence of the flow and the roughness of the surfaces. An unstructured computational grid is constructed for approximating the differential equations of the model by the second-order finite volume method. Calculations of four flow modes were carried out to determine the degree of isokinetic sampling using a specific slot-type probe. For one of the flow modes, calculations were made for different pressures at the outlet of the sampling probe. Calculations show that the degree of isokinetic sampling can be controlled by outlet pressure
To assess the isokineticity of sampling using a slot-type probe, the method of numerical modeling of the spatial flow of the working media was used. A three-dimensional digital model of the work area, including a sampling probe, was created. Based on the analysis of the flow conditions, concentration and size of aerosol particles, an appropriate mathematical model was formulated, considering the turbulence of the flow and the roughness of the surfaces. An unstructured computational grid is constructed for approximating the differential equations of the model by the second-order finite volume method. Calculations of four flow modes were carried out to determine the degree of isokinetic sampling using a specific slot-type probe. For one of the flow modes, calculations were made for different pressures at the outlet of the sampling probe. Calculations show that the degree of isokinetic sampling can be controlled by outlet pressure
Keywords:
ARMS, sampling, sampling probe, isokineticity
ARMS, sampling, sampling probe, isokineticity
1. GOST R 9096/ISO 2889-2010. Vybrosy stacionarnyh istochnikov. Opredelenie massovoy koncentracii tverdyh chastic ruchnym gravimetricheskim metodom.
2. Derevich I.V., Zaychik L.I. Uravnenie dlya plotnosti veroyatnosti skorosti i temperatury chastic v tubulentnom potoke, modeliruemom gaussovym sluchaynym polem//Prikl. matematika i mehanika. 1990. T. 54. Vyp. 5. S. 767-774.
3. Volkov E.P., Zaychik L.I., Pershukov V.A. Modelirovanie goreniya tverdogo topliva. M.: Nauka, 1994. 320 s.
4. B.E. Launder, D.B. Spalding, «The numerical computation of turbulent flows», Comp. Meth. App. Mech.Eng., vol. 3, №1, rr. 269-289, 1974.
