Temperature profiles in a controlled-stress parallel plate rheometer |
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Authors: | Dean A Barker D Ian Wilson |
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Institution: | (1) Department of Chemical Engineering, New Museums Site, Pembroke Street, Cambridge, CB2 3RA, UK |
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Abstract: | Actual melt temperatures are rarely measured directly when conducting rheological characterisations of materials in non-ambient
conditions despite the potentially large influence temperature may have on the rheological data. For rheometers that use only
a temperature-regulated lower plate, it is likely that the set point and true melt temperatures differ, an effect that becomes
significant when characterising melts or suspensions close to phase-change events like crystallisation. This work investigates
the magnitude of these effects for a controlled-stress rheometer featuring a temperature-controlled lower plate. The lower
plate was fitted with a serrated cover disc that was found to exacerbate temperature deviations from the desired set point.
Steady-state radial and vertical temperature profiles within the sample were measured and compared with the predictions of
a finite element analysis model. The deviations between set point and measured temperatures were successfully predicted by
the simulation for two typical gap heights for a thermoplastic, ceramic paste. The non-ideal heat transfer characteristics
were also investigated numerically for a representative polymer system that demonstrated the increased deviations from ideal
values for lower thermal conductivity materials.
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Keywords: | Rheometer Temperature Calibration Solidification Offset Simulation |
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