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Natural convection heat transfer is found in many industrial applications such as nuclear technologies, electronic circuit board cooling, solar panel cooling and many other fields. When natural convection heat transfer coefficients are insufficient, passive heat transfer enhancement devices (called ribs/fins) are often used. In this paper, the effect of periodic patterns of protrusions (ribs) on the free-convection heat transfer of a vertical plate, with a uniform heat flux rate boundary condition, is experimentally investigated. The convective fluid is air. Two-dimensional, high resolution heat transfer measurements are performed by using infrared thermography and the heated thin foil technique. Experiments are performed on two types of ribs pattern topology: single or two staggered rows of ribs inclined at different angles and single or two-staggered rows of V-ribs

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The purpose of this work is the investigation of convective heat transfer through a row of circular air jets internally impinging on an airfoil leading edge surface for anti-icing purposes. Measurements are performed with infrared thermography applied to the heated thin foil technique. Tests are carried out by varying: diameter and mutual spacing of jets, impinging distance, Reynolds and Mach numbers. A geometrical calibration of the infrared camera is performed. Data is presented in terms of Nusselt number maps. A new data correlation is proposed between the average Nusselt number and the Reynolds number, by accounting for the impingement angle.