Effects of flux chamber configuration on the sampling of odorous gases emissions
作者： Willian L Andreão , Jane M Santos , Neyval C Reis Jr , Ademir A Prata Jr , Richard M Stuetz
DOI: 10.1016/J.IJHEATMASSTRANSFER.2019.06.029
关键词: Mechanics 、 Materials science 、 Turbulence 、 Flux 、 Mass transfer 、 Boundary layer 、 Inlet 、 Shear velocity 、 Airflow 、 Mixing (process engineering) 、 Mechanical engineering 、 Condensed matter physics 、 Fluid Flow and Transfer Processes
摘要: Abstract Flux chambers are commonly used to measure emission rates of odorous compounds at passive liquid surfaces in wastewater treatment plants. Different flux configurations found the literature and main concern regards mixing inside chamber, which is linked impact on overall mass transfer between emitting surface headspace, sampling recovery efficiency. However, aspects related airflow influence measured rates. The coefficients gas phases functions friction velocity surface. This work investigates transport (with different Henry’s law constants) a chamber using Computational Fluid Dynamics, determine inlet rate (2, 5 10 L min−1), (4, 6 8 holes) inclusion internal fans rate. results showed complex flow concentration field that reaches steady state after residence times. use an fan promoting downward increased turbulence produced values interface closer those near boundary layer, whereas all other tested much lower velocity. Therefore, recommended.
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