The paper deals with heat transfer by convection between impinging gas jets and solid surfaces. It considers both
single and multiple jet systems. It emphasizes the flow and geometrical parameters as well as the environment
conditions at which the jet emerges. In particular, it points out the effect of the jet tilting, thermal entrainment and jet
confinement. ASN and ARN schemes are illustrated through industrial and aeronautical applications. Design
correlations are proposed. Experimental data obtained from infrared thermography are compared to CFD simulations