On determining the temperature dependent heat transfer coefficient

• Autorzy: Orzechowski T.
• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

boiling heat transfer; fin; heat polynomials; ill-posed problem; thermovision

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN ; Komitet Termodynamiki i Spalania PAN
• Czasopismo: Archives of Thermodynamics
• Rocznik: 2003
• Tom: Vol. 24, no 2
• Strony: 69--88
• Opis fizyczny: Bibliogr. 8 poz.,Rys., tabl.,

Twórcy

autor

Orzechowski T.

• Kielce University of Technology, al. 1000-lecia PP, 25-314 Kielce

Bibliografia

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• [3] CIALKOWSKI M. J., GRYSA K., JANKOWSKI J.: Numerical stability nvestigation of the inverse heat conduction problem, ZAMM, 74, 1994, T558-T560.
• [4] TALER J.: A general method for the experimental determiantion of local heat transfer coefficients, Waerme- und Stoffuebertragung, Bd 23(1988), 283-288.
• [5] MACIAG A., ORZECHOWSKI T., SZNAJDER D.: Analysis of 2D illposed problem of heat transfer in a rib, [in:] Heat Transfer and Renewable Sources of Energy, Ed. J. Mikielewicz and W. Nowak, Szczecin, 2002.
• [6] ÜNAL H. C.: An analytic study of boiling heat transfer from a fin, Int. J. Heat Mass Transfer, 30(1987), 341-349.
• [7] SEN A. K., TRINH S.: An exact solution for the rate of heat transfer from a rectangular fin governed by a power law-type temperature dependence, J. of Heat Transfer, 108(1986), 457-459.
• [8] ORZECHOWSKI T.: A local value of the heat transfer coefficient determination with the use of thermovision technique, Metrology and Measuring Systems, 7(2000), 101- 113, (in Polish).