Measurement of heat transfer coefficient and axial dispersion coefficient using temperature oscillations |
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| Authors: | Wilfried Roetzel Xing Luo Yimin Xuan |
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| Institution: | Institute of Thermodynamics, University of the Federal Armed Forces Hamburg, Hamburg, Germany |
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| Abstract: | A periodic transient test technique based on the axial dispersion model is proposed for the determination of both heat transfer coefficients and axial dispersion coefficients in heat exchangers. The model uses a parameter called the axial dispersive Peclet number to account for the deviation of the flow pattern from ideal plug flow. It takes both axial dispersion in the fluid and axial heat conduction in the wall into account and is solved analytically by means of a complex Fourier transform. Experiments conducted on dented copper tubes show that axial dispersion has a significant effect on the dynamic temperature response of a heat exchanger. |
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| Keywords: | heat exchangers axial dispersion measurement technique transient test technique periodic test technique dented tube complex Fourier transform |
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