✦ LIBER ✦

Measurement of heat transfer coefficient and axial dispersion coefficient using temperature oscillations

✍ Scribed by Wilfried Roetzel; Xing Luo; Yimin Xuan

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 717 KB
Volume: 7
Category: Article
ISSN: 0894-1777
DOI: 10.1016/0894-1777(93)90057-p

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✦ Synopsis

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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