Publikacje

Abstract:

The paper deals with analysis of a thermal field measured by means of a thermovision camera. A two-dimensional ill-posed problem of heat transfer was solved using a fin as an example. The quantity that needs to be found is the heat flux leaving the invisible inner surface of the fin. The method of heat functions was used for the calculations. The results of the numerical analysis of the problem are some local values of the transfer coefficients. The convergence of the calculation procedures was chacked by applying the heat balance to the considered area. Then, the optimal degree of the heat polynomials for such a problem was determined and the range of the method convergence was analysed. During the experiments, the heat transfer from the surface of a fin submerged in boiling water was observed. Values of heat transfer coefficients were determined and compared with the calculation results. A reasonable degree of congruence was found to exist between the calculation and experimental results.

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On determining the temperature dependent heat transfer coefficient