Impinging jets are used for heat and mass transfer in some industries. Previous impinging jet studies used thermocouples or liquid crystals to determine convection coefficients. These methods have inaccuracies that can be avoided with an infrared image temperature measurement. For this research, an infrared camera with a resolution of 0.025 degree(s)C was used to store images containing 52785 temperatures. The camera was checked for accuracy with a thermometer calibrated with a NIST standard. A facility for measuring surface heat transfer coefficients due to an impinging jet was developed. The infrared images obtained with the facility were used to identify impingement flow characteristics and to calculate local convection coefficients for in-line and radial jets. The results include photographs and convection coefficient graphs.
Thomas C. Gruber,
Robert H. Page,
"Infrared technique: heat transfer measurement", Proc. SPIE 2005, Optical Diagnostics in Fluid and Thermal Flow, (2 December 1993); doi: 10.1117/12.163706; https://doi.org/10.1117/12.163706