Determination of heat transfer coefficients during water cooling of metals

AbstractAbstractThe heat transfer coefficients for various cooling methods were investigated. Copper, aluminium, and nickel billets were heated and then subjected to cooling by water spray systems and immersion in water and mixtures of water and organic agents. The temperature close to the surface was measured and used for the calculation of the heat transfer coefficient by the implicit finite difference method. The results yielded a defined relation between the heat transfer coefficient and surface temperature, thermophysical material properties, and the intensity of spray cooling or the concentration of the organic agent in the bath. Using this data, a means for analytically formulating the heat transfer coefficient was obtained, enabling easy calculation to be made of the temperature field during quenching or cooling in continuous casting.MST/154