Wind Tunnel Measurement of Turbulent and Advective Scalar Fluxes: A Case Study on Intersection Ventilation
The objective of this study is to determine processes of pollution ventilation in the X-shaped street intersection in an idealized symmetric urban area for the changing approach flow direction. A unique experimental setup for simultaneous wind tunnel measurement of the flow velocity and the tracer g...
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| Format: | Article |
| Language: | English |
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Wiley
2012-01-01
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| Series: | The Scientific World Journal |
| Online Access: | http://dx.doi.org/10.1100/2012/381357 |
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| author | Libor Kukačka Štĕpán Nosek Radka Kellnerová Klára Jurčáková Zbyněk Jaňour |
| author_facet | Libor Kukačka Štĕpán Nosek Radka Kellnerová Klára Jurčáková Zbyněk Jaňour |
| author_sort | Libor Kukačka |
| collection | DOAJ |
| description | The objective of this study is to determine processes of pollution ventilation in the X-shaped street intersection in an idealized symmetric urban area for the changing approach flow direction. A unique experimental setup for simultaneous wind tunnel measurement of the flow velocity and the tracer gas concentration in a high temporal resolution is assembled. Advective horizontal and vertical scalar fluxes are computed from averaged measured velocity and concentration data within the street intersection. Vertical advective and turbulent scalar fluxes are computed from synchronized velocity and concentration signals measured in the plane above the intersection. All the results are obtained for five approach flow directions. The influence of the approach flow on the advective and turbulent fluxes is determined. The contribution of the advective and turbulent flux to the ventilation is discussed. Wind direction with the best dispersive conditions in the area is found.
The quadrant analysis is applied to the synchronized signals of velocity and concentration fluctuation to determine events with the dominant contribution to the momentum flux and turbulent scalar flux. |
| format | Article |
| id | doaj-art-e9ab41a0fb054f7caaff543a856f1969 |
| institution | Kabale University |
| issn | 1537-744X |
| language | English |
| publishDate | 2012-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | The Scientific World Journal |
| spelling | doaj-art-e9ab41a0fb054f7caaff543a856f19692025-02-03T01:20:41ZengWileyThe Scientific World Journal1537-744X2012-01-01201210.1100/2012/381357381357Wind Tunnel Measurement of Turbulent and Advective Scalar Fluxes: A Case Study on Intersection VentilationLibor Kukačka0Štĕpán Nosek1Radka Kellnerová2Klára Jurčáková3Zbyněk Jaňour4Department of Meteorology and Environment Protection, Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, 180 00 Prague, Czech RepublicInstitute of Thermomechanics AS CR, v.v.i., Dolejškova 1402/5, 182 00 Prague, Czech RepublicDepartment of Meteorology and Environment Protection, Faculty of Mathematics and Physics, Charles University in Prague, V Holešovičkách 2, 180 00 Prague, Czech RepublicInstitute of Thermomechanics AS CR, v.v.i., Dolejškova 1402/5, 182 00 Prague, Czech RepublicInstitute of Thermomechanics AS CR, v.v.i., Dolejškova 1402/5, 182 00 Prague, Czech RepublicThe objective of this study is to determine processes of pollution ventilation in the X-shaped street intersection in an idealized symmetric urban area for the changing approach flow direction. A unique experimental setup for simultaneous wind tunnel measurement of the flow velocity and the tracer gas concentration in a high temporal resolution is assembled. Advective horizontal and vertical scalar fluxes are computed from averaged measured velocity and concentration data within the street intersection. Vertical advective and turbulent scalar fluxes are computed from synchronized velocity and concentration signals measured in the plane above the intersection. All the results are obtained for five approach flow directions. The influence of the approach flow on the advective and turbulent fluxes is determined. The contribution of the advective and turbulent flux to the ventilation is discussed. Wind direction with the best dispersive conditions in the area is found. The quadrant analysis is applied to the synchronized signals of velocity and concentration fluctuation to determine events with the dominant contribution to the momentum flux and turbulent scalar flux.http://dx.doi.org/10.1100/2012/381357 |
| spellingShingle | Libor Kukačka Štĕpán Nosek Radka Kellnerová Klára Jurčáková Zbyněk Jaňour Wind Tunnel Measurement of Turbulent and Advective Scalar Fluxes: A Case Study on Intersection Ventilation The Scientific World Journal |
| title | Wind Tunnel Measurement of Turbulent and Advective Scalar Fluxes: A Case Study on Intersection Ventilation |
| title_full | Wind Tunnel Measurement of Turbulent and Advective Scalar Fluxes: A Case Study on Intersection Ventilation |
| title_fullStr | Wind Tunnel Measurement of Turbulent and Advective Scalar Fluxes: A Case Study on Intersection Ventilation |
| title_full_unstemmed | Wind Tunnel Measurement of Turbulent and Advective Scalar Fluxes: A Case Study on Intersection Ventilation |
| title_short | Wind Tunnel Measurement of Turbulent and Advective Scalar Fluxes: A Case Study on Intersection Ventilation |
| title_sort | wind tunnel measurement of turbulent and advective scalar fluxes a case study on intersection ventilation |
| url | http://dx.doi.org/10.1100/2012/381357 |
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