Indications of segmental flow in straight pipes by flow injection with spectrophotometric detection

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Author list: Andersen JET

Publisher: Royal Swedish Academy of Sciences; 1999

Place: STOCKHOLM

Publication year: 2000

Journal: Physica Scripta -Supplement T- (0281-1847)

Journal acronym: PHYS SCRIPTA

Volume number: 62

Issue number: 4

Start page: 331

End page: 340

Number of pages: 10

ISSN: 0281-1847

Languages: English-Great Britain (EN-GB)

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Abstract

A procedure of spectrophotometric analysis of fluid how in pipes is described and its performance is tested on three different dye compounds. The procedure follows measurement and mathematical de-convolution of the signal with an exponential function that is associated with molecular diffusion. Evidence is provided for the presence of segmental how and the three dye compounds, used as tracer molecules, indicate that the solute molecules gain velocity, predominantly in the streamwise direction, from the solvent how rate. The additional velocity, as gained from the solvent flow rate, depends on a kinetic-diffusion constant and the internal friction of the system. The model allows a calculation of the dow-injection signal and serves as a tool for the investigation of properties of fluid dynamics.

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