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Original title:
Aspects of Dosage from Short and Long Duration Emissions
Authors: Robins, A. ; Hayden, P. ; Gallacher, D. ; Pace, S. ; Chaloupecká, Hana
Document type: Papers
Conference/Event: PHYSMOD 2022 - The International Workshop on Physical Modelling of Flow and Dispersion Phenomena, Praha (CZ), 20220829
Year: 2022
Language: eng
Abstract: The objectives of this work were to use wind tunnel concentration measurements to describe the structure of dispersing clouds from an elevated source in a deep turbulent boundary layer and to develop scaling rules that reduce the results to a universal form. The experiments were carried out in the EnFlo meteorological wind tunnel at the University of Surrey. Ensembles of between 100 and 200\nrepeat emissions were used, emission durations between 0.067 and 1.02s and a reference flow speed of 2ms-1. The fetch studied extended to about six source heights downwind (about two boundary layer depths). The structure of the evolving clouds was analysed to determine time of flight, along-wind spread and dosage and to compare the dosage behaviour with the concentration field in a plume from the same source. This illustrated how the two were related and how cloud dosage statistics (mean and\nstandard deviation) could be derived from plume data. It also demonstrated that much larger ensembles were required to reduce the statistical uncertainty in the mean cloud properties. The next steps involve testing these conclusions in a wider range of flow and dispersion conditions, in the presence of obstacles or complex urban areas.
Keywords: dosage; dose; gas releases; wind tunnel
Host item entry: International Workshop on Physical Modeling of Flow and Dispersion Phenomena - Book of Abstracts, ISBN 978-80-87012-81-9
Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: https://hdl.handle.net/11104/0339222
Permalink: http://www.nusl.cz/ntk/nusl-520535
The record appears in these collections:
Research > Institutes ASCR > Institute of Thermomechanics
Conference materials > Papers
Authors: Robins, A. ; Hayden, P. ; Gallacher, D. ; Pace, S. ; Chaloupecká, Hana
Document type: Papers
Conference/Event: PHYSMOD 2022 - The International Workshop on Physical Modelling of Flow and Dispersion Phenomena, Praha (CZ), 20220829
Year: 2022
Language: eng
Abstract: The objectives of this work were to use wind tunnel concentration measurements to describe the structure of dispersing clouds from an elevated source in a deep turbulent boundary layer and to develop scaling rules that reduce the results to a universal form. The experiments were carried out in the EnFlo meteorological wind tunnel at the University of Surrey. Ensembles of between 100 and 200\nrepeat emissions were used, emission durations between 0.067 and 1.02s and a reference flow speed of 2ms-1. The fetch studied extended to about six source heights downwind (about two boundary layer depths). The structure of the evolving clouds was analysed to determine time of flight, along-wind spread and dosage and to compare the dosage behaviour with the concentration field in a plume from the same source. This illustrated how the two were related and how cloud dosage statistics (mean and\nstandard deviation) could be derived from plume data. It also demonstrated that much larger ensembles were required to reduce the statistical uncertainty in the mean cloud properties. The next steps involve testing these conclusions in a wider range of flow and dispersion conditions, in the presence of obstacles or complex urban areas.
Keywords: dosage; dose; gas releases; wind tunnel
Host item entry: International Workshop on Physical Modeling of Flow and Dispersion Phenomena - Book of Abstracts, ISBN 978-80-87012-81-9
Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: https://hdl.handle.net/11104/0339222
Permalink: http://www.nusl.cz/ntk/nusl-520535
The record appears in these collections:
Research > Institutes ASCR > Institute of Thermomechanics
Conference materials > Papers
Record created 2023-02-12, last modified 2023-12-06