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  • 1 Mining Division Wardrop Engineering Saskatoon SK S7K 5T6 Canada
  • | 2 University of New Brunswick Saint John NB E2L 4L5 Canada
  • | 3 University of New Brunswick Fredericton NB E3B 5A3 Canada
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Abstract  

The paper describes a new transient hot wire instrument which employs 25.4 μm diameter tantalum wire with an insulating tantalum pentoxide coating. This hot-wire cell with a thin insulating layer is suitable for measurement of the thermal conductivity and the thermal diffusivity of electrically conducting and polar liquids. This instrument has been used for experimental measurement of the thermal conductivity and the thermal diffusivity of poly(acrylic acid) solution (50 mass%) in the temperature range of 299 to 368 K at atmospheric pressure. The thermal conductivity data is estimated to be accurate within ±4%. Thermal diffusivity measurements have a much higher uncertainty (±30%) and need further refinement.