Abstract
A heat transfer coefficient identification model has been developed which considers multiple boundary with different conditions using influence coefficient matrix derived from a mathematically and numerically obtained Jacobian matrix. The model was applied to a top surface and bottom surface heat transfer estimation problem, i.e. two unknown quantities problem, for an infinite flat steel plate which is subject to different boundary conditions. The method yields thus fast and accurate heat transfer coefficient results as well as the temperature distribution which is in excellent agreement with measured one. Further application of the model was two-dimensional problem of a work roll temperature and boundary condition estimation while rolling a hot strip. The two-dimensional temperature distribution of a cross section of the roll was calculated by using heat transfer coefficient as input values which are inversely identified by the already calculated temperature distribution. The identified heat transfer coefficient directly confronted with the input value exhibiting the method’s capacity for multiple-point identification of heat transfer coefficient.
