Evaluation method of single blow experiment for the determination of heat transfer coefficient and dispersive Peclet number

• Autorzy: Roetzel W. , Na Ranong C.

Identyfikatory

DOI

10.1515/aoter-2015-0029

• Języki publikacji: EN

Abstrakty

EN

An evaluation method is developed for single blow experiments with liquids on heat exchangers. The method is based on the unity Mach number dispersion model. The evaluation of one experiment yields merely one equation for the two unknowns, the number of transfer units and the dispersive Peclet number. Calculations on an example confirm that one single blow test alone cannot provide reliable values of the unknowns. A second test with a liquid of differing heat capacity is required, or a tracer experiment for the measurement of the Peclet number. A modified method is developed for gases. One experiment yields the effective number of transfer units and approximate values of the two unknowns. The numerical evaluation of calculated experiments demonstrates the applicability of the evaluation methods.

Słowa kluczowe

EN

heat exchanger; single blow experiment; evaluation method; dispersion model

PL

wymiennik ciepła; eksperyment; metoda oceny; model dyspersji

• Wydawca: Wydawnictwo Instytutu Maszyn Przepływowych PAN ; Komitet Termodynamiki i Spalania PAN
• Czasopismo: Archives of Thermodynamics
• Rocznik: 2015
• Tom: Vol. 36, no. 4
• Strony: 3--24
• Opis fizyczny: Bibliogr. 9 poz., rys., tab.

Twórcy

autor

Roetzel W.

• Helmut Schmidt University/University of the Federal Armed Forces Hamburg, Insitute of Thermodynamics, 22039 Hamburg, Germany

autor

Na Ranong C.

• Helmut Schmidt University/University of the Federal Armed Forces Hamburg, Insitute of Thermodynamics, 22039 Hamburg, Germany

Bibliografia

• [1] HEGGS P.J., BURNS D.: Single-blow experimental prediction of heat transfer coefficients – a comparison of four commonly used techniques. Exp. Therm. Fluid Sci. 1(1988), 3 , 243–251.
• [2] ROETZEL W., XUAN Y.: Dynamic behaviour of heat exchangers. WIT Press, Comput. Mech. Publ., Southhampton 1999.
• [3] LUO X., ROETZEL W., LÜDERSEN U.: The single-blow transient testing technique considering longitudinal core conduction and fluid dispersion. Heat Mass Transfer 44(2001), 121–129.
• [4] ROETZEL W., Na RANONG C., FIEG G.: New axial dispersion model for heat exchanger design. Heat Mass Transfer 47(2011), 1009–1017.
• [5] VDI Wärmeatlas, 11. Auflage. Springer, Berlin 2013.
• [6] ROETZEL W., NA RANONG C.: Evaluation of residence time measurements on heat exchangers for the determination of dispersive Peclet numbers. In: Proc. 14th Int. Symp. on Heat Transfer and Renewable Sources of Energy, 2012, 219–228. Revised and extended version: Arch. Thermodyn. 35(2014), 2, 103–115, DOI: 10.2478/aoter-2014-0016 (accessed on Dec. 2014).
• [7] NA RANONG C., ROETZEL W.: Unity Mach number axial dispersion model for heat exchanger design. 6th European Thermal Sciences Conf. Eurotherm, 2012. In: J. Phys. Conf. Ser. 395 012052, http://dx.doi.org/10.1088/1742-6596/395/1/012052.
• [8] HONIG G.: Zur numerischen Lösung partieller Differentialgleichungen mit Laplace-Transformation. Berichte der Kernforschungsanstalt Jülich, Jülich 1978 (in German).
• [9] ROETZEL W., NA RANONG C.: On the application of the Wilson plot technique. Heat Technol. 21(2003), 2, 125–130.