This title appears in the Scientific Report : 2021 
SETCOM: Separate Effect Test for Condensation Modelling
Belt, Alexander (Corresponding author)
Arnold, Lukas / Kelm, Stephan / Floyd, Jason / Mc Dermott, Randall / Gross, Eva
Zivile Sicherheitsforschung; IAS-7
2021
3th International Symposium on Fire Safety Science, Waterloo (Canada), 2021-04-26 - 2021-04-30
Poster
Enabling Computational- & Data-Intensive Science and Engineering
OpenAccess
Please use the identifier: http://hdl.handle.net/2128/27834 in citations.


The SETCOM (Separate Effect Test for Condensation Modeling) facility operated at Forschungszentrum Jülich (Germany) is an experimental flow channel originally designed to analyze the near wall condensation phenomena in presence of non-condensable gases in the context of a loss of coolant accident (LOCA) of light water reactors (LWR). In this work, SETCOM measurements of velocity, temperature, and heat flux in the presence of wall condensation are being used to test the new wall condensation modeling capability in the Fire Dynamics Simulator (FDS). In addition, wall models describing the wall shear and heat flux for large- eddy simulation (LES) in the presence of mass transfer are being tested and improved through this validation exercise.Condensation can play a role in large scale plume rise, as occurs in unstable atmospheric boundary layers. Plume dynamics then affect the fallout pattern of smoke emissions from fires. Within tunnels, at long distances from a fire source, surfaces may be cool enough to condense water vapor and this may effect aerosol deposition rates as well. In this work, the existing aerosol transport algorithms in FDS have been developed to include a volumetric source/sink term that allows for condensation (conversion of gas species to liquid species with associated energy conversion). The SETCOM data presents a first step in validating the FDS condensation model.SETCOM enables a systematic experimental investigation of the near wall phenomena for a large range of Richardson numbers (Ri). The test facility is a 6 m long rectangular (0.44 x 0.44 m2) flow channel, which is integrated to a closed loop system. It provides boundary conditions from laminar to turbulent and from mixed to forced convection. Further, the experiment can be operated under condensing conditions (air-steam- mixture). By a variable inclination (0°-90°) of the test channel and by cooling one of the surfaces buoyancy effects can be investigated systematically. By suitable optical accesses measurement, e.g., Particle Image Velocimetry and Laser Doppler Velocimetry, for the quantification of the near wall properties can be applied. The range of inlet gas temperature is from ambient to 100°C. Flow velocities from 0.5 to 5 m/s can be arranged. This leads to a range of Ri from 0.05 to 120.Within the poster session the SETCOM facility will be introduced more in detail and the first results of the FDS wall condensation model validation will be presented.