Rapid measurement of liquid thermal conductivity by the transient hot-wire method

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Abstract
A modification of the transient hot‐wire method of measuring liquid thermal conductivities provides simplified operation through direct plotting of wire resistance as a function of logarithm of time, following application of a constant heating current. An electronic transient recorder operating from a logarithmic time base stores resistance readings at equal increments of log time for subsequent plotting by a servo recorder on linear coordinates. Multiplication of the inverse slope of the resulting curve by an instrumental constant gives the thermal conductivity. Designed for obtaining engineering data of moderate precision and accuracy, the method was tested on water, methanol, carbon tetrachloride, and toluene. The results obtained were 0.4–4.4% lower than recent literature values for these liquids. The relative standard deviation of repeated measurements was 0.5–1.0%.
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