Analysis on heat transfer in metal quenching experiments with sprays and jets are presented in this book. Under different cooling methods, the influence of specific process parameters is discussed. The samples of different kind of metals heated up to the designated initial temperature are used in the study. An infrared camera is used to measure the transient temperature during the quenching process which is the basis for the determination of the Leidenfrost and DNB temperature, the maximum heat flux, and the heat transfer coefficient in the film boiling regime. Review on the width of the wetting front is also presented. One-dimensional energy balance model is applied to analyze the heat transfer by considering its comparison to two-dimensional inverse analysis. Discussion on the spray quenching is started by presenting a theoretical model used to estimate heat flux in the film boiling regime. The model is based on the hydrodynamic of a single droplet which is separated from the metal by a vapor film. The influence of size and velocity of the droplet, impingement density, surface temperature, temperature of the cooling water, material properties, and the salinity level from the experimental and calculated results are compared. The influence of salinity in the cooling water is studied separately by comparing different type of solutions from various concentrations including the real solutions used in different metal processing industries. The electrical conductivity (EC) is proposed to be used instead of concentration for the sake of practicability when measuring the salinity level in the cooling water. Review on quenching with small section of real mold in form of series of jets is carried out under static and moving mechanism. The influence of different jet velocities, initial temperatures, kind of metals, water temperatures and casting speeds is studied. Under the moving mechanism, the mold traverses from the lower to the upper part of the sample to have a similar relative displacement between mold and aluminum strand as in the real DC casting process.weiterlesen