Measurements and CFD modeling of indoor thoron distribution

Chauhan, Neetika; Chauhan, R. P.; Joshi, Manish; Agarwal, Tarun K.; Sapra, B.K.

doi:10.1016/j.atmosenv.2015.01.029

Cited by 16 publications

(8 citation statements)

References 21 publications

(28 reference statements)

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“…The radon concentration field could, therefore, be obtained using scalarTransportFoam, which is a solver for passive scalar transport in a given velocity field [26]. Transport equations for mass, momentum, and concentration of species were described, following [27].…”

Section: Governing Equationsmentioning

confidence: 99%

Computational Fluid Dynamic Simulation of Inhaled Radon Dilution by Auxiliary Ventilation in a Stone-Coal Mine Laneway and Dosage Assessment of Miners

Zhou

Chang

2019

Processes

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Inhaled radon status in the laneways of some Chinese stone-coal mines is a cause of concern. In this study, computational fluid dynamics simulations were employed to investigate three flowrates of the dilution gas (2.5, 5, and 7.5 m 3 /s) and radon distributions at realistic breathing levels (1.6, 1.75, and 1.9 m). The results showed that there are obvious jet-flow, backflow, and vortex zones near the heading face, and a circulation flow at the rear of the laneway. A high radon concentration area was found to be caused by the mining machinery. As the ventilation rate increased, the radon concentrations dropped significantly. An airflow of 7.5 m 3 /s showed the best dilution performance: The maximum radon concentration decreased to 541.62 Bq/m 3 , which is within the safe range recommended by the International Commission on Radiological Protection. Annual effective doses for the three air flowrates were 8.61, 5.50, and 4.12 mSv.

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Section: Governing Equationsmentioning

confidence: 99%

Computational Fluid Dynamic Simulation of Inhaled Radon Dilution by Auxiliary Ventilation in a Stone-Coal Mine Laneway and Dosage Assessment of Miners

Zhou

Chang

2019

Processes

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“…To study the effect of in let air ve loc ity, mag ni tude on the in door thoron dis tri bu tion pat tern, mod el ing was per formed on CFD plat form. The mea sure ment of thoron flux from the wall was mea sured with ac tive tech niques and re sults for the same test room are shown else where [14]. The de tails of the ge om e try and mesh of the test room can be found in our ear lier stud ies [9], how ever bound ary con di tions were changed ac cord ing to the in let ve loc ity at the door.…”

Section: Cfd Mod El Ingmentioning

confidence: 99%

“…Steady-state flow field was es tab - lished in the room af ter solv ing the mass and mo mentum equa tions. The gov ern ing math e mat i cal equa tions and sim u la tion pa ram e ters are de scribed else where [14].…”

Section: Cfd Mod El Ingmentioning

confidence: 99%

“…This model in cludes the pro duc tion from the wall and de cay (due to ra dio ac tive de cay and ven ti la tion) of thoron. The ex ha la tion of thoron gas from the room surfaces was con sid ered as the main source mea sured in ear lier study [14]. The pres ent model gives the knowl -edge of thoron dis per sion in the in door en vi ron ment to as sess the in door ra di a tion ex po sure.…”

Section: Introductionmentioning

confidence: 99%

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Distribution of indoor thoron in dwellings under normal and turbulent flow conditions using CFD simulation technique

2017

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Ex ten sive work has been car ried out on mea sure ment of ra don and thoron lev els in in door envi ron ment in last three de cades. These stud ies are im por tant from ra di a tion pro tec tion point of view, if one con sid ered the con tri bu tion of ra don, thoron and their de cay prod ucts to to tal in ha la tion dose. Nu mer ous stud ies on ra don mea sure ment well es tab lished the be hav iour of its dis per sion in dwell ings. But the short lives of thoron cause the dif fi culty to un der stand the dis tri bu tion of thoron in dwell ings. The prob lem be comes more com pli cated when thoron dis per sion is stud ied un der dif fer ent in let air flow rate. Dif fer ent air flow pat tern may cause dif fer ent thoron level at dif fer ent point in test dwell ings caus ing un cer tainty in the mea surements. This work uti lized the CFD sim u la tion tech nique for study of in door thoron dis persion in test dwell ings un der nor mal and tur bu lent flow of air. The sim u la tion study for thoron dis tri bu tion in a test room was per formed for air ve loc i ties 0.10 ms-1 , 0.25 ms-1 , 0.50 ms-1 , 1.0 ms-1 , 1.5 ms-1 , and 2.0 ms-1. The re sults show that the thoron dis tri bu tion be comes uniform for the in let ve loc ity more than 0.5 ms-1 and ap pro pri ate to mea sure in door thoron concen tra tion. While in nor mal con di tion the mea sured thoron level var ies de pend ing upon the lo ca tion of do sim e ter. Thoron dif fu sion and mi gra tion length are also in creased with air flow rate.

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“…In recent years also advanced Computational Fluid Dynamics (CFD) models have been developed to model the dispersion of thoron (Chauhan et al, 2015) and its progeny as well as the attachment and deposition of the progeny nuclides (De With and De Jong, 2011).…”

Section: Introductionmentioning

confidence: 99%

Impact from indoor air mixing on the thoron progeny concentration and attachment fraction

Jong

2016

Journal of Environmental Radioactivity

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Measurements and CFD modeling of indoor thoron distribution

Cited by 16 publications

References 21 publications

Computational Fluid Dynamic Simulation of Inhaled Radon Dilution by Auxiliary Ventilation in a Stone-Coal Mine Laneway and Dosage Assessment of Miners

Computational Fluid Dynamic Simulation of Inhaled Radon Dilution by Auxiliary Ventilation in a Stone-Coal Mine Laneway and Dosage Assessment of Miners

Distribution of indoor thoron in dwellings under normal and turbulent flow conditions using CFD simulation technique

Impact from indoor air mixing on the thoron progeny concentration and attachment fraction

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