Investigation of swirl pipe for improving cleaning efficiency in closed processing system
This thesis provides unique insights into the fundamentals of improving the efficiency of ‘Clean-In-Place’ procedures in closed processing systems by locally introducing intensified hydrodynamic force from swirl flows induced by an optimised four-lobed swirl pipe without increasing the overall flow...
| Main Author: | |
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| Format: | Thesis (University of Nottingham only) |
| Language: | English |
| Published: |
2016
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| Online Access: | https://eprints.nottingham.ac.uk/33779/ |
| _version_ | 1848794703351250944 |
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| author | LI, Guozhen |
| author_facet | LI, Guozhen |
| author_sort | LI, Guozhen |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | This thesis provides unique insights into the fundamentals of improving the efficiency of ‘Clean-In-Place’ procedures in closed processing systems by locally introducing intensified hydrodynamic force from swirl flows induced by an optimised four-lobed swirl pipe without increasing the overall flow velocities.
The studies, carried out employing Computational Fluid Dynamics (CFD) techniques, pressure transmitters and a fast response Constant Temperature Anemometer (CTA) system, covered further optimisation of the four-lobed swirl pipe, RANS-based modelling and Large Eddy Simulation of the swirl flows, and experimental validation of the CFD models through the measurements of pressure drop and wall shear stress in swirl flows with various Reynolds Number.
The computational and experimental work showed that the swirl pipe gives rise to a clear increase of mean wall shear stress to the downstream with its value and variation trend being dependent on swirl intensity. Moreover, it promotes a stronger fluctuation rate of wall shear stress to the downstream especially further downstream where swirl effect is less dominant.
As the increase of either the mean or the fluctuation rates of wall shear stress contributes to the improvement of CIP procedures in the closed processing systems. This thesis demonstrates that, with the ability to exert strengthened hydrodynamic force to the internal surface of the pipe downstream of it without increasing the overall flow velocity, the introduction of swirl pipe to the CIP procedures should improve the cleaning efficiency in the closed processing systems, consequently shortening the downtime for cleaning, and reducing the costs for chemicals and power energy. |
| first_indexed | 2025-11-14T19:20:24Z |
| format | Thesis (University of Nottingham only) |
| id | nottingham-33779 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T19:20:24Z |
| publishDate | 2016 |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-337792025-02-28T11:49:24Z https://eprints.nottingham.ac.uk/33779/ Investigation of swirl pipe for improving cleaning efficiency in closed processing system LI, Guozhen This thesis provides unique insights into the fundamentals of improving the efficiency of ‘Clean-In-Place’ procedures in closed processing systems by locally introducing intensified hydrodynamic force from swirl flows induced by an optimised four-lobed swirl pipe without increasing the overall flow velocities. The studies, carried out employing Computational Fluid Dynamics (CFD) techniques, pressure transmitters and a fast response Constant Temperature Anemometer (CTA) system, covered further optimisation of the four-lobed swirl pipe, RANS-based modelling and Large Eddy Simulation of the swirl flows, and experimental validation of the CFD models through the measurements of pressure drop and wall shear stress in swirl flows with various Reynolds Number. The computational and experimental work showed that the swirl pipe gives rise to a clear increase of mean wall shear stress to the downstream with its value and variation trend being dependent on swirl intensity. Moreover, it promotes a stronger fluctuation rate of wall shear stress to the downstream especially further downstream where swirl effect is less dominant. As the increase of either the mean or the fluctuation rates of wall shear stress contributes to the improvement of CIP procedures in the closed processing systems. This thesis demonstrates that, with the ability to exert strengthened hydrodynamic force to the internal surface of the pipe downstream of it without increasing the overall flow velocity, the introduction of swirl pipe to the CIP procedures should improve the cleaning efficiency in the closed processing systems, consequently shortening the downtime for cleaning, and reducing the costs for chemicals and power energy. 2016-06-03 Thesis (University of Nottingham only) NonPeerReviewed application/pdf en arr https://eprints.nottingham.ac.uk/33779/1/INVESTIGATION%20OF%20SWIRL%20PIPE%20FOR%20IMPROVING%20CLEANING%20EFFICIENCY%20IN%20CLOSED%20PROCESSING%20SYSTEM.pdf LI, Guozhen (2016) Investigation of swirl pipe for improving cleaning efficiency in closed processing system. PhD thesis, University of Nottingham. Swirl pipe Clean-In-Place Wall shear stress CFD Large Eddy Simulation hot-film Anemometry |
| spellingShingle | Swirl pipe Clean-In-Place Wall shear stress CFD Large Eddy Simulation hot-film Anemometry LI, Guozhen Investigation of swirl pipe for improving cleaning efficiency in closed processing system |
| title | Investigation of swirl pipe for improving cleaning efficiency in closed processing system |
| title_full | Investigation of swirl pipe for improving cleaning efficiency in closed processing system |
| title_fullStr | Investigation of swirl pipe for improving cleaning efficiency in closed processing system |
| title_full_unstemmed | Investigation of swirl pipe for improving cleaning efficiency in closed processing system |
| title_short | Investigation of swirl pipe for improving cleaning efficiency in closed processing system |
| title_sort | investigation of swirl pipe for improving cleaning efficiency in closed processing system |
| topic | Swirl pipe Clean-In-Place Wall shear stress CFD Large Eddy Simulation hot-film Anemometry |
| url | https://eprints.nottingham.ac.uk/33779/ |