Temperaturfeldberechnung aus einer Particle Image Velocimetry Messung

The article presents a calculation method for determining fluid flow temperature field data using a laser optical measurement procedure. Basis for solving the energy transport (heat) equation are velocity fields obtained by stereoscopic Particle Image Velocimetry (PIV) measurements. PIV is a laser optical measurement method for quantitatively capturing velocity fields. Since there is no intrusive sensor necessary it allows for undisturbed flow measurements. Stereoscopic PIV measures generate grid data with pixel-wise information of all three components of velocity vectors within a single two-dimensional image layer of the flow. The temperature distribution at the domain boundaries is determined punctually (by temperature diodes) and surface-wise by extensive infrared imaging. Energy transport from the boundaries through the interior of the measurement area is calculated in terms of the inlet flow characteristics. The energy equation of the Navier-Stokes equations defines the fundamentals for the energy transport within the fluid. Its solution using a numerical model results in the temperature distribution of the measurement area. The method is demonstrated by the free convection plume of a human. The procedure is promising since it is possible to get high resolution temperature field data of indoor air flows, as related laser induced fluorescence methods (LIF) are not appropriate in doors as in this case harmful tracers and toxic particles must be used