Interpretation of T-Bar Tool Measurements for Yield Stress Materials
The T-bar rheometrical tool (Brookfield Engineering Laboratories, Inc.) is a slender rod which is placed in a material and rotated horizontally about its short axis by a vertical shaft. The torque on the shaft from laminar flow of material around the rod is determined by the material’s rheological p...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
De Gruyter
2012-10-01
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| Series: | Applied Rheology |
| Subjects: | |
| Online Access: | https://doi.org/10.3933/applrheol-22-55370 |
| _version_ | 1819290852786176000 |
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| author | Anderson V.J. Meeten G.H. |
| author_facet | Anderson V.J. Meeten G.H. |
| author_sort | Anderson V.J. |
| collection | DOAJ |
| description | The T-bar rheometrical tool (Brookfield Engineering Laboratories, Inc.) is a slender rod which is placed in a material and rotated horizontally about its short axis by a vertical shaft. The torque on the shaft from laminar flow of material around the rod is determined by the material’s rheological properties. T-bar experiments for a Newtonian liquid are shown to agree closely with existing theory. For yield stress materials an approximation is derived for the torque on a rotating T-bar which is supported by experiments on a range of materials. The torque for very slow rotational speed is insensitive to boundaries beyond a few T-bar diameters and is shown to correlate with the material’s yield stress and other non-Newtonian parameters. A step-decrease in torque for each half-revolution of the T-bar was shown by some materials and possible origins of this effect are discussed. |
| first_indexed | 2024-12-24T03:29:20Z |
| format | Article |
| id | doaj.art-673e08b88bee4b0bb6c83f9eb24ed238 |
| institution | Directory Open Access Journal |
| issn | 1617-8106 |
| language | English |
| last_indexed | 2024-12-24T03:29:20Z |
| publishDate | 2012-10-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Applied Rheology |
| spelling | doaj.art-673e08b88bee4b0bb6c83f9eb24ed2382022-12-21T17:17:15ZengDe GruyterApplied Rheology1617-81062012-10-0122510.3933/applrheol-22-55370Interpretation of T-Bar Tool Measurements for Yield Stress MaterialsAnderson V.J.0Meeten G.H.1Fluid Mechanics Department, Schlumberger Cambridge Research, High Cross, Madingley Road,CambridgeCB3 0EL, UKFluid Mechanics Department, Schlumberger Cambridge Research, High Cross, Madingley Road,CambridgeCB3 0EL, UKThe T-bar rheometrical tool (Brookfield Engineering Laboratories, Inc.) is a slender rod which is placed in a material and rotated horizontally about its short axis by a vertical shaft. The torque on the shaft from laminar flow of material around the rod is determined by the material’s rheological properties. T-bar experiments for a Newtonian liquid are shown to agree closely with existing theory. For yield stress materials an approximation is derived for the torque on a rotating T-bar which is supported by experiments on a range of materials. The torque for very slow rotational speed is insensitive to boundaries beyond a few T-bar diameters and is shown to correlate with the material’s yield stress and other non-Newtonian parameters. A step-decrease in torque for each half-revolution of the T-bar was shown by some materials and possible origins of this effect are discussed.https://doi.org/10.3933/applrheol-22-55370rheometryt-barvaneyield stressthixotropyviscoplasticity |
| spellingShingle | Anderson V.J. Meeten G.H. Interpretation of T-Bar Tool Measurements for Yield Stress Materials Applied Rheology rheometry t-bar vane yield stress thixotropy viscoplasticity |
| title | Interpretation of T-Bar Tool Measurements for Yield Stress Materials |
| title_full | Interpretation of T-Bar Tool Measurements for Yield Stress Materials |
| title_fullStr | Interpretation of T-Bar Tool Measurements for Yield Stress Materials |
| title_full_unstemmed | Interpretation of T-Bar Tool Measurements for Yield Stress Materials |
| title_short | Interpretation of T-Bar Tool Measurements for Yield Stress Materials |
| title_sort | interpretation of t bar tool measurements for yield stress materials |
| topic | rheometry t-bar vane yield stress thixotropy viscoplasticity |
| url | https://doi.org/10.3933/applrheol-22-55370 |
| work_keys_str_mv | AT andersonvj interpretationoftbartoolmeasurementsforyieldstressmaterials AT meetengh interpretationoftbartoolmeasurementsforyieldstressmaterials |