Simulation of Turbulent Mixing Effects on Essential NO<sub>x</sub>–O<sub>3</sub>–Hydrocarbon Photochemistry in Convective Boundary Layer
The turbulence kinetics model (TKM) describes an overall reaction rate for microscopic mass transfer phenomenon expressed as separation intensity, <i>I<sub>s</sub></i>, in a turbulent reacting flow. This study examines the effects of turbulent mixing in the convective boundar...
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MDPI AG
2019-01-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/9/2/357 |
| _version_ | 1818689379609083904 |
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| author | Mi-Sug Kim |
| author_facet | Mi-Sug Kim |
| author_sort | Mi-Sug Kim |
| collection | DOAJ |
| description | The turbulence kinetics model (TKM) describes an overall reaction rate for microscopic mass transfer phenomenon expressed as separation intensity, <i>I<sub>s</sub></i>, in a turbulent reacting flow. This study examines the effects of turbulent mixing in the convective boundary layer (CBL) on essential NOx⁻O<sub>3</sub>⁻Hydrocarbon photochemistry containing sources of NO and a surrogate reactive hydrocarbon. The modeling approach applies for all species except OH with an assumption of a photostationary steady state. The TKM results reveal principal findings as follows: (1) effects of turbulence on reaction rates lead to significant segregations throughout most of the CBL in reaction pairs NO + O<sub>3</sub>, RH + OH and NO + HO<sub>2</sub>; (2) segregations permit significantly higher concentrations of NO and RH to build up and endure in the CBL than would occur for a non-turbulent atmosphere; (3) turbulent segregation influences limit and shift the ranges of NO and O<sub>3</sub> concentrations compared to the non-turbulent case; (4) while there are differences between the TKM results and those for a published Large Eddy simulation (LES) of the same chemical system, there are also strong similarities. Therefore, a future study remains to compare model results to observations if and when appropriately time-resolved measurements of reacting species are obtained. |
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| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-12-17T12:09:10Z |
| publishDate | 2019-01-01 |
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| spelling | doaj.art-02f555df18c9455bb8cee6e8e7fa6dd02022-12-21T21:49:29ZengMDPI AGApplied Sciences2076-34172019-01-019235710.3390/app9020357app9020357Simulation of Turbulent Mixing Effects on Essential NO<sub>x</sub>–O<sub>3</sub>–Hydrocarbon Photochemistry in Convective Boundary LayerMi-Sug Kim0Department of Environmental Engineering, Mokpo National University, # B20-2012, 1666, Yeongsan-ro, Dorim-ri, Cheonggye-myeon, Muan-gun, Jeollanam-do 58554, KoreaThe turbulence kinetics model (TKM) describes an overall reaction rate for microscopic mass transfer phenomenon expressed as separation intensity, <i>I<sub>s</sub></i>, in a turbulent reacting flow. This study examines the effects of turbulent mixing in the convective boundary layer (CBL) on essential NOx⁻O<sub>3</sub>⁻Hydrocarbon photochemistry containing sources of NO and a surrogate reactive hydrocarbon. The modeling approach applies for all species except OH with an assumption of a photostationary steady state. The TKM results reveal principal findings as follows: (1) effects of turbulence on reaction rates lead to significant segregations throughout most of the CBL in reaction pairs NO + O<sub>3</sub>, RH + OH and NO + HO<sub>2</sub>; (2) segregations permit significantly higher concentrations of NO and RH to build up and endure in the CBL than would occur for a non-turbulent atmosphere; (3) turbulent segregation influences limit and shift the ranges of NO and O<sub>3</sub> concentrations compared to the non-turbulent case; (4) while there are differences between the TKM results and those for a published Large Eddy simulation (LES) of the same chemical system, there are also strong similarities. Therefore, a future study remains to compare model results to observations if and when appropriately time-resolved measurements of reacting species are obtained.https://www.mdpi.com/2076-3417/9/2/357turbulentmixingsegregationCBLphotochemistry |
| spellingShingle | Mi-Sug Kim Simulation of Turbulent Mixing Effects on Essential NO<sub>x</sub>–O<sub>3</sub>–Hydrocarbon Photochemistry in Convective Boundary Layer Applied Sciences turbulent mixing segregation CBL photochemistry |
| title | Simulation of Turbulent Mixing Effects on Essential NO<sub>x</sub>–O<sub>3</sub>–Hydrocarbon Photochemistry in Convective Boundary Layer |
| title_full | Simulation of Turbulent Mixing Effects on Essential NO<sub>x</sub>–O<sub>3</sub>–Hydrocarbon Photochemistry in Convective Boundary Layer |
| title_fullStr | Simulation of Turbulent Mixing Effects on Essential NO<sub>x</sub>–O<sub>3</sub>–Hydrocarbon Photochemistry in Convective Boundary Layer |
| title_full_unstemmed | Simulation of Turbulent Mixing Effects on Essential NO<sub>x</sub>–O<sub>3</sub>–Hydrocarbon Photochemistry in Convective Boundary Layer |
| title_short | Simulation of Turbulent Mixing Effects on Essential NO<sub>x</sub>–O<sub>3</sub>–Hydrocarbon Photochemistry in Convective Boundary Layer |
| title_sort | simulation of turbulent mixing effects on essential no sub x sub o sub 3 sub hydrocarbon photochemistry in convective boundary layer |
| topic | turbulent mixing segregation CBL photochemistry |
| url | https://www.mdpi.com/2076-3417/9/2/357 |
| work_keys_str_mv | AT misugkim simulationofturbulentmixingeffectsonessentialnosubxsubosub3subhydrocarbonphotochemistryinconvectiveboundarylayer |