Absolute measurement of thermal conductivity of poly (acrylic acid) by transient hot wire technique |
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Authors: | F Tian L Sun S C Mojumdar J E S Venart R C Prasad |
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Institution: | (1) University of New Brunswick, Saint John, NB, E2L 4L5, Canada;(2) University of New Brunswick, Fredericton, NB, E3B 5A3, Canada |
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Abstract: | The transient hot-wire method is considered the most accurate technique to measure the thermal conductivity of fluids. In
this study, a transient hot wire instrument which employs 25.4-μm-diameter tantalum wire with an insulating tantalum pentoxide
coating has been used. This hot-wire cell with a thin insulating layer is suitable for measurement of the thermal conductivity
of electrically conducting and polar liquids. Measurements of the thermal conductivity of 50 wt% solution of PAA poly (acrylic
acid)] in water and PAA–Na in 50 wt% water are reported here. These measurements were obtained in the temperature range of
299–368 K at 1 atmospheric pressure. The measurement of thermal conductivity is estimated to be accurate within ±4%. |
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