Cole, Pamela Anne (2013). Cleaning of toothpaste from process equipment by fluid flow at laboratory and pilot scales. University of Birmingham. Eng.D.
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Cole13EngD.pdf
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Abstract
Cleaning studies were performed to remove toothpaste by fluid flow at different temperatures and velocities to mimic CIP (Cleaning-In-Place) processes on toothpaste coated coupons at laboratory scale and fully filled pipeline at pilot scale (different lengths and diameters). The cleaning time was reduced by increasing the velocity and temperature of the water, however no further time benefit was seen above 40°C.
The adhesive force for different pastes calculated from micromanipulation data followed the same trend as cleaning times on the laboratory cleaning rig. This cleaning data for the different paste formulations had a logarithmic relationship with the viscosity term from the Herschel-Bulkley rheological model.
Removal of toothpaste from pipes occurred by the core of the paste being removed from the centre of the pipe to leave a thin coating on the pipe wall, which was then eroded by flow. Pipes of lengths between 0.3 m and 2 m (47.7 mm diameter pipe) showed no difference in cleaning time. The rate limiting process was removal of the thin wall coating and therefore not a function of length. An inverse wall shear stress relationship with cleaning time was found to represent all the data, at all scales and under all conditions.
| Type of Work: | Thesis (Doctorates > Eng.D.) | ||||||||||||||||||
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| Award Type: | Doctorates > Eng.D. | ||||||||||||||||||
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| College/Faculty: | Colleges (2008 onwards) > College of Engineering & Physical Sciences | ||||||||||||||||||
| School or Department: | School of Chemical Engineering | ||||||||||||||||||
| Funders: | Engineering and Physical Sciences Research Council | ||||||||||||||||||
| Subjects: | T Technology > TP Chemical technology | ||||||||||||||||||
| URI: | http://etheses.bham.ac.uk/id/eprint/4128 |
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