This paper presents an innovative dilatometer that can measure the pressure-volume-temperature (PVT) properties of solutions in a molten state. The basic rationale of the design is to determine the density (or equivalently, the specific volume) of a solution by separately measuring the mass and volume flow rates of the solution flowing in an extruder at each temperature and pressure. A positive-displacement gear pump mounted on an extruder is used to measure the volume flow rate of the solution. A single-phase solution is formed by injecting a metered amount of into a polymer melt and completely dissolving it in the melt using a foam extrusion line. The temperature of solution was precisely controlled and homogenized by using the second extruder in a tandem system and a heat exchanger with a static mixer. The pressure was controlled by the rotational speed of the screw in the second extruder. In order to reduce leakage across the gear pump, the difference between the upstream and downstream pressures was minimized using a variable resistance valve attached downstream of the gear pump. The mass flow rate was measured by directly collecting the extruded polymer melt for a fixed time after degassing A critical set of experiments was carried out to verify the functions of the system using pure polymer melts with known PVT data. Finally, the system was used to measure the specific volume of solutions as a function of concentration, temperature, and pressure.
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February 2002
Technical Papers
Development of a Dilatometer for Measurement of the PVT Properties of a Solution Using a Foaming Extruder and a Gear Pump
Simon S. Park,
Simon S. Park
Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario, Canada M5S 3G8
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Chul B. Park,
Chul B. Park
Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario, Canada M5S 3G8
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Dmitry Ladin,
Dmitry Ladin
Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario, Canada M5S 3G8
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Hani E. Naguib,
Hani E. Naguib
Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario, Canada M5S 3G8
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Costas Tzoganakis
Costas Tzoganakis
Department of Chemical Engineering, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
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Simon S. Park
Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario, Canada M5S 3G8
Chul B. Park
Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario, Canada M5S 3G8
Dmitry Ladin
Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario, Canada M5S 3G8
Hani E. Naguib
Microcellular Plastics Manufacturing Laboratory, Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario, Canada M5S 3G8
Costas Tzoganakis
Department of Chemical Engineering, University of Waterloo, Waterloo, Ontario, Canada N2L 3G1
Contributed by the Manufacturing Engineering Division for publication in the JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING. Manuscript received Aug. 1999; Revised Mar. 2001. Associate Editor: J. Lee.
J. Manuf. Sci. Eng. Feb 2002, 124(1): 86-91 (6 pages)
Published Online: March 1, 2001
Article history
Received:
August 1, 1999
Revised:
March 1, 2001
Citation
Park , S. S., Park, C. B., Ladin , D., Naguib, H. E., and Tzoganakis, C. (March 1, 2001). "Development of a Dilatometer for Measurement of the PVT Properties of a Solution Using a Foaming Extruder and a Gear Pump ." ASME. J. Manuf. Sci. Eng. February 2002; 124(1): 86–91. https://doi.org/10.1115/1.1418696
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