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The study of the flow interaction and the heat transfer between air jets and a surface is of paramount importance in industrial processes that apply air jet impingement. To ensure a good performance of the process, high heat transfer rates and uniformization of the flow over the target plate are required. In this work, a particle image velocimetry (PIV) technique was implemented for the measurement of the flow velocity fields. However, as any real experiment, the values recorded by the PIV method are subjected to several errors that compromise the reliability and accuracy of the measurements. These errors can have different sources, from the installation and alignment to the particles seeding and calibration procedure. To maximize the accuracy of the experimental results, this paper focuses on the identification of measurement errors and uncertainty quantification of an experimental setup purposely built for the analysis of the interaction between air jets and a target surface. This paper presents an analysis of the system, and the source of errors are identified, quantified, and, when possible, corrected. The particle seeding is characterized, and its efficiency for the flow tracking is analyzed. The setup was tested to fully characterize the flow field in terms of mean velocity profile and turbulence intensity over a wide range of Reynolds numbers and temperature. Several velocity fields are then measured until convergence of the flow quantities is reached. The combination of these measurements with high spatial resolution and low measurement errors allows us to obtain accurate and precise measurements.

A series of experiments were carried out on water film flow formed by a water discharge system on the surface of steel shutters. The experiments used three types of steel shutters for fire protection. The rates for waterWssupplied to the steel shutter from the slit of the water discharge system was changed. First, the water film flow that formed on the convex surfaces of the main curved parts of connected shutter slats was observed under non-heating conditions. Then, the velocity of water film flow on the surface of steel shutter was analyzed by direct cross-correlation method using PIV system. Next, the temperature distribution and other parameters of the water film flow were investigated under heating conditions using a radiation panel. The heating condition was changed by adjusting the separation distance between the radiation panel and the test specimen. To measure the temperatures on the non-heated side of the test specimen, K-type thermocouples were used. Fundamental knowledge was obtained about the behavior of water film flow on steel shutter surfaces under non-heating conditions as well as the thermal insulation and other effects of the water film under heating conditions.