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Communication Dans Un Congrès Année : 2011

Influence of whey protein aggregation on the residence time distribution in a helically holding tube during heat treatment process

F.T. Ndoye
D. Flick
G. Alvarez
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Résumé

The residence time distribution (RTD) of a flowing whey protein (WP) suspension through a helically tubular system was studied. The experimental system is the helical holding section of a thermal process pilot. RTD was measured in isothermal conditions at 60°C, a temperature involving any WP aggregation, and at 87°C, temperature at which WP aggregates. Two flow rates (20 L/h and 49 L/h) were tested with two different lengths of holding tube in order to maintain the same order of magnitude of the holding time. Methylene blue was used as tracer and spectrophotometer analysis were performed to determine the outlet concentration. These investigations yielded to great differences between the RTD in aggregation and no aggregation conditions. The minimum residence time is shorter when WP aggregation occurs due to the modification of the velocity field inside the holding tube with the enhancement of the viscosity. The mean residence time remains the same whatever the holding temperature at the low flow rate. However, it is slightly shorter when the flow rate increases probably due to the increasing of secondary flow circulation which narrows the RTD in curved tubes. Fitting the experimental results with the generalized laminar model confirms the shorter minimum residence time when WP aggregate. These results help to understand the WP aggregates size dispersion.
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Dates et versions

hal-00801688 , version 1 (18-03-2013)

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F.T. Ndoye, N. Erabit, D. Flick, G. Alvarez. Influence of whey protein aggregation on the residence time distribution in a helically holding tube during heat treatment process. 11th International Congress On Engineering and Food, May 2011, Athènes, Greece. 2 p. ⟨hal-00801688⟩
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