Electrodiffusional wall shear rate analysis in scraped surface heat exchanger

Dumont, Éric; Fayolle, Francine; Legrand, Jack

doi:10.1002/aic.690460606

Cited by 20 publications

(10 citation statements)

References 26 publications

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“…This paper is part of a larger work that aims to optimize the overall operating conditions for the use of ice slurry, in order to enable its industrial use. As in many studies [29]we chose to uncouple the hydrodynamics and heat transfer by working in isothermal conditions, in order to analyze the hydrodynamics of ice slurry in the range of laminar to low turbulent flows. Further studies will deal with the coupled phenomena.…”

Section: Introductionmentioning

confidence: 99%

Experimental determination of the energy optimum for the transport of floating particles in pipes

Edelin

Czujko

Castelain

et al. 2015

Experimental Thermal and Fluid Science

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a b s t r a c tThis paper reports the results of an experimental investigation into the transport of fluids composed of water and polypropylene particles, in order to study the transport of floating particles.The determination of the pressure drop and the delivered concentration, for a wide combination of flow rates (0-0.5 kg s À1 ), solid loads (0-25 %vol) and particles mean sizes (341-756 lm), enabled the transport efficiency for this kind of slurry in a circular horizontal pipe (30 mm diameter) to be measured. The results are displayed in relation to flow patterns; they show that the size of the particles has a little impact on the transport efficiency. On the contrary, the flow rate and the volumetric concentration have a strong impact on efficiency, because of their large contribution to the flow pattern. The best operating conditions are obtained close to the limit deposition velocity, when the fully suspended pattern is reached. The solids are then well transported with no waste of energy due to a too high velocity. The optimum concentrations, for a wide range of high efficiency are around 20-25 %vol.

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Section: Introductionmentioning

confidence: 99%

Experimental determination of the energy optimum for the transport of floating particles in pipes

Edelin

Czujko

Castelain

et al. 2015

Experimental Thermal and Fluid Science

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“…Dumont et al (2000a) have shown with an electrochemical technique that large fluctuations of shear rates are observed and the maximum is obtained when blades scrape the measuring probe mounted at the wall surface. Dumont et al (2000b) indicated that the majority of shear rate models established for scraped surface heat exchangers are insufficient to predict high shear rates located at the wall scraped surface.…”

Section: With Two Bladesmentioning

confidence: 96%

“…Benezech and Maingonnat (1993) analysed the residence time distribution and indicated that the critical value of the Taylor number for which there was a transition from pure laminar flow to Taylor vortices flow lied between 10 and 25. Dumont, Fayolle, and Legrand (2000a) showed that the presence of blades promoted the appearance of instabilities at lower values of generalised Taylor number (Ta g % 10). Dumont et al (2000b) showed from visual investigations and wall shear rate measurements that the transition occurs for Ta g % 80, and that the Taylor vortices are thwarted by the rotation of blades at both ends of the exchanger.…”

Section: Introductionmentioning

confidence: 99%

Relation between mechanical treatment of starch and flow conditions in a scraped surface heat exchanger

Mabit

Loisel

Fayolle

et al. 2004

Food Research International

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“…S and S c were calculated in scraping situations in order to obtain the maximal value of wall shear rate (S max ). Dumont et al (2000b) concluded that the current variations were so fast (high values of dI=dt) that corrections were di cult to calculate accurately. Thus, the actual value of S max should stand between the wall shear rate S calculated using (Eq.…”

Section: Scraping Surface Studymentioning

confidence: 98%