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Thermal Expansion and Its Effect on the Normal Force for a Modified Force Rebalance Transducer



Carl R. Schultesiz, G B. McKenna


Prior work in this laboratory [Niemiec, et al, J. Rheology, 40, 323-334 (1996)] showed that anomalous normal forces could arise in rotary shear measurements when thermal expansion of the force rebalance transducer (FHT) superimposed a squeezing flow on the shear flow. Transducer heating results from the current to the magnetic coils in the FRT necessary to counteract the applied torque. Partly due to this work, the manufacturer redesigned the transducer by replacing stainless steel components with Invar, an alloy with a very low coefficient of thermal expansion. Tests on the new transducer show that the thermal expansion is significantly reduced. The behavior of the new transducer is described.
Proceedings Title
SPE ANTEC Proceedings
Conference Dates
May 2-6, 1999
Conference Location
New York, NY
Conference Title


force rebalance transducer, rheometer, thermal expansion


Schultesiz, C. and McKenna, G. (1999), Thermal Expansion and Its Effect on the Normal Force for a Modified Force Rebalance Transducer, SPE ANTEC Proceedings, New York, NY, [online], (Accessed June 20, 2024)


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Created December 31, 1998, Updated October 12, 2021