Active-passive measurements and CFD based modelling for indoor radon dispersion study

Chauhan, Neetika; Chauhan, R. P.

doi:10.1016/j.jenvrad.2015.03.009

Cited by 17 publications

(7 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Equation 7is simplified as a two-dimensional (2D) equation presented in (8). Figure 2 describes the configuration of radon transport from the depth to the surface.…”

Section: Theorymentioning

confidence: 99%

See 1 more Smart Citation

Finite-Difference Time-Domain Simulations of Radon Transport in Porous Media

et al. 2020

View full text Add to dashboard Cite

“…Equation 7is simplified as a two-dimensional (2D) equation presented in (8). Figure 2 describes the configuration of radon transport from the depth to the surface.…”

Section: Theorymentioning

confidence: 99%

“…In the field of radon intrusion, a range of analytical and numerical models have been developed [5][6][7][8]. Several two-dimensional analytical models have been developed recently [5,9].…”

Section: Introduction mentioning

confidence: 99%

Finite-Difference Time-Domain Simulations of Radon Transport in Porous Media

et al. 2020

View full text Add to dashboard Cite

“…In previous studies, the pollution source was usually assumed to be fixed. 31–36 Chauhan and Chauhan 34 and Chauhan et al. 34,35 studied the diffusion of indoor radon and thorium using uniform pollutant emissions.…”

Section: Introductionmentioning

confidence: 99%

“…31–36 Chauhan and Chauhan 34 and Chauhan et al. 34,35 studied the diffusion of indoor radon and thorium using uniform pollutant emissions. Zhuang et al.…”

Section: Introductionmentioning

confidence: 99%

Implementing an emissions-rate model in computational fluid dynamics simulations of contaminant diffusion processes: A case study with xylene in painting workshops

Liu

Huang

Yuan³

et al. 2020

Indoor and Built Environment

View full text Add to dashboard Cite

Organic solvents frequently lead to substantial occupational health issues in secondary industries. This study examined the xylene diffusion process in painting workshops as a case study to develop a control of indoor air quality in manufacturing workshops. Three-dimensional simulations of xylene emission were built based on a ventilated chamber test to provide the source term for the mathematical model. An exponential relationship was established between xylene emissions rates and time. Numerical results obtained using the emissions rate model were more consistent with experimental data than those from constant emission rate. Owing to the property that is denser than air; therefore, given the coupled influence of molecular diffusion, gravity and environmental turbulence, the xylene concentration at a height of 0.75–2.5 m is high, and it could possibly exceed the Chinese standard, GBZ 2.1–2019 permissible concentration time weighted average (PC-TWA) of 50 mg/m3 in human-occupied zones. At the height of the human breathing zone (1.1 m), the aggregated concentration may even exceed the PC-TWA at 450 s by 100 times. Considering that the diffusion of xylene in a painting workshop represents heavy-gas pollutant diffusion problems, this study can be extended to predict pollutant concentration distributions in other secondary industrial workshops.

show abstract

“…The ven ti la tion is an im por tant fac tor that can in flu ence the mea sure ment of thoron. The ra don which is a gas sim i lar to thoron with half-life of 3.824 days has dif fer ent dis tri bu tion be hav iour when compared with thoron us ing CFD tech nique for a test room un der closed and open room con di tions [8,9]. The in let air ve loc ity var ied from 0.01 ms -1 (closed room con dition) to 2 ms -1 (open room un der dif fer ent ven ti la tion rate) while it takes value of only 0.5 ms -1 for nor mal living room con di tion.…”

Section: Introductionmentioning

confidence: 99%

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

2017

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Active-passive measurements and CFD based modelling for indoor radon dispersion study

Cited by 17 publications

References 7 publications

Finite-Difference Time-Domain Simulations of Radon Transport in Porous Media

Finite-Difference Time-Domain Simulations of Radon Transport in Porous Media

Implementing an emissions-rate model in computational fluid dynamics simulations of contaminant diffusion processes: A case study with xylene in painting workshops

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

Contact Info

Product

Resources

About