Shear rates investigation in a scraped surface heat exchanger
The electrodiffusion technique was performed in order to investigate the shear rate on a scraped surface heat exchanger. Microelectrodes were placed inside: the walls of the outer cylinder; the inlet and outlet bowls; the rotor and the blades. Highly viscous Newtonian fluid (Emkarox HV45 solutions)...
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| Veröffentlicht in: | Chemical engineering science 2003-11, Vol.58 (20), p.4667-4679 |
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| creator | Mabit, Jérôme Fayolle, Francine Legrand, Jack |
| description | The electrodiffusion technique was performed in order to investigate the shear rate on a scraped surface heat exchanger. Microelectrodes were placed inside: the walls of the outer cylinder; the inlet and outlet bowls; the rotor and the blades. Highly viscous Newtonian fluid (Emkarox HV45 solutions) and non-Newtonian model fluid (aqueous solutions of CMC) were used. The electrodiffusion method allowed us to measure wall shear rates. Maximum shear rate was observed at the scraping surface and caused by blades scraping, high shear rate was also measured on the leading edge of the blades. In the other parts of the exchanger, shear rate remained low but the development of Taylor vortices completely modified the scraped surface heat exchangers behaviour inside the surface of the bowls. A dimensionless representation of the friction factor was established for the inner and outer wall surface of the exchanger. |
| doi_str_mv | 10.1016/j.ces.2003.07.001 |
| format | Article |
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Microelectrodes were placed inside: the walls of the outer cylinder; the inlet and outlet bowls; the rotor and the blades. Highly viscous Newtonian fluid (Emkarox HV45 solutions) and non-Newtonian model fluid (aqueous solutions of CMC) were used. The electrodiffusion method allowed us to measure wall shear rates. Maximum shear rate was observed at the scraping surface and caused by blades scraping, high shear rate was also measured on the leading edge of the blades. In the other parts of the exchanger, shear rate remained low but the development of Taylor vortices completely modified the scraped surface heat exchangers behaviour inside the surface of the bowls. A dimensionless representation of the friction factor was established for the inner and outer wall surface of the exchanger.</description><identifier>ISSN: 0009-2509</identifier><identifier>EISSN: 1873-4405</identifier><identifier>DOI: 10.1016/j.ces.2003.07.001</identifier><identifier>CODEN: CESCAC</identifier><language>eng</language><publisher>Oxford: Elsevier Ltd</publisher><subject>Applied sciences ; Devices using thermal energy ; Electrochemistry ; Energy ; Energy. 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Microelectrodes were placed inside: the walls of the outer cylinder; the inlet and outlet bowls; the rotor and the blades. Highly viscous Newtonian fluid (Emkarox HV45 solutions) and non-Newtonian model fluid (aqueous solutions of CMC) were used. The electrodiffusion method allowed us to measure wall shear rates. Maximum shear rate was observed at the scraping surface and caused by blades scraping, high shear rate was also measured on the leading edge of the blades. In the other parts of the exchanger, shear rate remained low but the development of Taylor vortices completely modified the scraped surface heat exchangers behaviour inside the surface of the bowls. A dimensionless representation of the friction factor was established for the inner and outer wall surface of the exchanger.</description><subject>Applied sciences</subject><subject>Devices using thermal energy</subject><subject>Electrochemistry</subject><subject>Energy</subject><subject>Energy. Thermal use of fuels</subject><subject>Exact sciences and technology</subject><subject>Fluid mechanics</subject><subject>Food processing</subject><subject>Heat exchangers (included heat transformers, condensers, cooling towers)</subject><subject>Non-Newtonian fluids</subject><subject>Scraped surface heat exchanger</subject><subject>Taylor–Couette–Poiseuille flow</subject><issn>0009-2509</issn><issn>1873-4405</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2003</creationdate><recordtype>article</recordtype><recordid>eNqNkMFqGzEQhkVJoY6TB-htL81ttyNp19ql5BBMkhYCPaQ5i9nRyJFxdl1pbZK3j4wNvYWehh--mfn5hPgqoZIgF9_XFXGqFICuwFQA8pOYydbosq6hORMzAOhK1UD3RZyntM7RGAkzcf34zBiLiBOnIgx7TlNY4RTGIacCi0QRt-yKtIseiYtMTwW_0jMOK44X4rPHTeLL05yLp7vbP8uf5cPv-1_Lm4eSdGumcuE6p71G8NoDm54kcNsrQNeiNr4hJkd93yjtmHsDPndG5xrFhuueGj0XV8e72zj-3eWO9iUk4s0GBx53ySrTtaqr_ws0rTImg_IIUhxTiuztNoYXjG9Wgj0YtWubjdqDUQvGZqN559vpOCbCjY84UEj_FhtpFnWnMvfjyHFWsg8cbaLAA7ELkWmybgwffHkHee-MKQ</recordid><startdate>20031101</startdate><enddate>20031101</enddate><creator>Mabit, Jérôme</creator><creator>Fayolle, Francine</creator><creator>Legrand, Jack</creator><general>Elsevier Ltd</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>F28</scope><scope>FR3</scope><scope>7TB</scope></search><sort><creationdate>20031101</creationdate><title>Shear rates investigation in a scraped surface heat exchanger</title><author>Mabit, Jérôme ; Fayolle, Francine ; Legrand, Jack</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c387t-6d9d3f3a0f3f0e7bc10e8b20ad8a37f5cecdcbb523deeb70f405add52e7e4bc53</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2003</creationdate><topic>Applied sciences</topic><topic>Devices using thermal energy</topic><topic>Electrochemistry</topic><topic>Energy</topic><topic>Energy. 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| identifier | ISSN: 0009-2509 |
| ispartof | Chemical engineering science, 2003-11, Vol.58 (20), p.4667-4679 |
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| language | eng |
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| source | Elsevier ScienceDirect Journals |
| subjects | Applied sciences Devices using thermal energy Electrochemistry Energy Energy. Thermal use of fuels Exact sciences and technology Fluid mechanics Food processing Heat exchangers (included heat transformers, condensers, cooling towers) Non-Newtonian fluids Scraped surface heat exchanger Taylor–Couette–Poiseuille flow |
| title | Shear rates investigation in a scraped surface heat exchanger |
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