The following information was submitted:
Transactions: WSEAS TRANSACTIONS ON HEAT AND MASS TRANSFER
Transactions ID Number: 52-637
Full Name: Jose Rabi
Position: Professor
Age: ON
Sex: Male
Address: Av. Duque de Caxias Norte 225, 13635-900, Pirassununga, SP
Country: BRAZIL
Tel: +55-19-35654257
Tel prefix:
Fax: +55-19-35654284
E-mail address: jrabi@usp.br
Other E-mails: jose_rabi@hotmail.com
Title of the Paper: radon-222 accumulation in air confined by phosphogypsum-bearing boundaries: simulation for distinct exhaling scenarios
Authors as they appear in the Paper: Jose Rabi, Nivaldo Silva
Email addresses of all the authors: jrabi@usp.br, ncsilva@cnen.gov.br
Number of paper pages: 10
Abstract: Understanding radon-222 exhalation from phosphogypsum-bearing materials and its accumulation in confined air is fundamental for radiation exposure assessment and radiological protection design based on human health risks. Despite evoking time dependence, zero-order models with respect to space assume uniform distribution of radon-222 activity. If detailed description is desired, one must consider spatial dependence as well. Accordingly, this work proposes a time-varying two-dimensional diffusion-dominant model where radon-222 self-decay is accounted as a sink term in the governing differential equation while its exhalation from boundaries is modelled as Neumann-type boundary condition. By adapting an existing academic simulator for transport phenomena, distinct exhaling scenarios are numerically simulated and discussed bearing in mind the failure of the aforesaid homogeneous distribution hypothesis as well as future extensions of the simulator.
Keywords: Mass transfer, Modelling, Simulation, Phosphogypsum, Radon-222, Radiological protection
EXTENSION of the file: .pdf
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How Did you learn about congress: Simulation, Modeling and Experimental Research in heat and mass transfer, Transport Phenomena, Indoor pollution, Environmental protection, Waste Management
IP ADDRESS: 143.107.188.8
