Gast ::
| Hauptseite > Publikationsdatenbank > Experimental determination of convective heat flux to a PMMA surface |
| Hauptseite > Publikationsdatenbank > Experimental determination of convective heat flux to a PMMA surface |
| Poster (After Call) | FZJ-2017-06177 |
; ;
2017
Please use a persistent id in citations: http://hdl.handle.net/2128/15239
Abstract: In the presented experimental study we investigate the thermal interaction of small scale buoyant flows with solid boundaries. The generated data will be used for FDS (Fire Dynamics Simulator) validation. In our previous studies of a spill plume, the experimental data differed significantly from the simulation data. This simplified experiment will allow us to examine the heat flux through the enclosure walls, made out of Plexiglas (PMMA), and to analyse the potential contribution to the differences. The experimental setup consists of a rectangular Plexiglas box with the dimensions of 0.32 x 0.32 x 0.25 [m^3] and a variable opening on one side. The heating source, an electrically powered block of copper, which can be operated at different power settings and can therefore produce laminar and turbulent plumes, is placed in the centre of this enclosure. As we focus on the spatially and temporally resolved heat flux through the enclosure, the temperatures are recorded with a thermal imaging camera to determine them on the inside and outside surfaces. The heat flux through the walls (including the ceiling) is then calculated by the local temperature difference between the inner and the outer side, while taking the thermal properties of the enclosure into account. In addition to this, temperatures are recorded by thermocouples at selected positions at the surfaces, as a reference for the thermal imaging measurements, and in the free gas volume of the enclosure. With the heat flux data further simulations are realized using FDS. The temperatures, the flow velocity and the occurrence of turbulence in the spill plume in these simulations are compared to experimental data. A further step will be to apply the findings to an extended experimental setup. This examines the influence of the ceiling height and inclination on the flow properties and the heat transfer through the enclosure.
|
The record appears in these collections: |
PDF
PDF (PDFA)