“…The experimental results for toluene listed in Table in which each datum was the average of four to six runs agreed very well within ±1.1% with the recommended data . According to ref , the maximum expanded uncertainty ( k = 2) of toluene is ±0.00213 W·m -1 ·K -1 . 3 Typical recording of the temperature rise of the wire, toluene ( T = 270.15 K, P = 1.465 W·m -1 ).…”
Section: Experimental Apparatussupporting
confidence: 64%
“…The global uncertainty of the experimental thermal conductivity obtained with the transient hot-wire method was estimated as follows. , The length of the platinum wire between the potential leads was measured by a cathetometer, and δ L / L was accurate to 0.02%. The uncertainty in the temperature coefficient of the platinum wire was estimated to be within ±0.2%, the uncertainty in the heat generation of the hot wire was less than ±0.2%, and the uncertainty in the temperature-rise slope d Δ T / (d ln t ) of the hot wire was less than ±0.8%.…”
The thermal conductivities of ethylene glycol monobutyl ether, dimethyl ether, methyl ethyl ketone, castor
oil, and vegetable seed oil in the near-saturated liquid phase have been measured in the temperature
range from (229 to 375) K by the transient hot-wire method with a bare platinum wire. The uncertainty
of the experimental results was estimated to be within ±2.0%, and the reproducibility of the data was
better than ±0.5%. The liquid thermal conductivities obtained have been correlated as a polynomial
function of the temperature, with an absolute mean deviation from the experimental data of less than
0.4% and a maximum deviation of less than 0.6%.
“…The experimental results for toluene listed in Table in which each datum was the average of four to six runs agreed very well within ±1.1% with the recommended data . According to ref , the maximum expanded uncertainty ( k = 2) of toluene is ±0.00213 W·m -1 ·K -1 . 3 Typical recording of the temperature rise of the wire, toluene ( T = 270.15 K, P = 1.465 W·m -1 ).…”
Section: Experimental Apparatussupporting
confidence: 64%
“…The global uncertainty of the experimental thermal conductivity obtained with the transient hot-wire method was estimated as follows. , The length of the platinum wire between the potential leads was measured by a cathetometer, and δ L / L was accurate to 0.02%. The uncertainty in the temperature coefficient of the platinum wire was estimated to be within ±0.2%, the uncertainty in the heat generation of the hot wire was less than ±0.2%, and the uncertainty in the temperature-rise slope d Δ T / (d ln t ) of the hot wire was less than ±0.8%.…”
The thermal conductivities of ethylene glycol monobutyl ether, dimethyl ether, methyl ethyl ketone, castor
oil, and vegetable seed oil in the near-saturated liquid phase have been measured in the temperature
range from (229 to 375) K by the transient hot-wire method with a bare platinum wire. The uncertainty
of the experimental results was estimated to be within ±2.0%, and the reproducibility of the data was
better than ±0.5%. The liquid thermal conductivities obtained have been correlated as a polynomial
function of the temperature, with an absolute mean deviation from the experimental data of less than
0.4% and a maximum deviation of less than 0.6%.
“…The analyses follow general rules for evaluating and expressing the uncertainty in measurement, established as the ISO GUM method (Guide to the Expression of Uncertainty in Measurement) -the method that has been adopted by various regional metrology and related organizations worldwide [7][8][9]. The GUM approach has been followed in expressing the estimated uncertainty of several thermophysical properties including thermal conductivity using the transient hot-strip technique [10], the guarded hot-plate technique [11], or the transient hot-wire method [12,13]. The measurement results obtained for thermal diffusivity using the laser flash method have been metrologically evaluated [14,15], and the uncertainty was systematically analyzed and expressed for different laser flash systems following the GUM recommendations [16].…”
The paper deals with the uncertainty analysis for thermal diffusivity measurements using the laser flash method. A general metrological characterization of the high temperature thermal diffusivity measurement apparatus has been carried out. The metrological investigation follows the general rules for the evaluation and expression of uncertainty in measurement. This work presents a brief introduction to the flash method. It summarizes the main disturbing phenomena that may significantly influence the accuracy of the thermal diffusivity measurement. It gives a detailed description of the high temperature laser flash experimental apparatus installed at Austrian Research Centers. The paper also gives results of test measurements of the thermal diffusivity of a standard material, i.e., austenitic steel X10NiCrMoTiB1515 in the temperature range 20-900 • C. The results are compared with literature data and discussed. Sources of measurement errors are analyzed; components of uncertainty are categorized according to their evaluation method. The results are subjected to rigorous statistical evaluation to determine the uncertainty associated with thermal diffusivity measurements.
Thermal conductivity of binary aqueous solutions of 1,2-ethanediol and 1,2propanediol was measured using the transient hot wire method at temperature from 253.15 K to 373.15 K at atmospheric. Measurements were made for six compositions over the entire concentration range from 0 to 1 mole fraction of glycol, namely, 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0 mole fraction of glycol. The uncertainty of the thermal conductivity, temperature, and concentration measurements are estimated to be better than ±2%, 0.01K, 0.1%, respectively. The second-order Scheffé polynomial is used to correlate the temperature and composition dependence of the experimental thermal conductivity, which is found to be in good agreement with the experiment data from the present work and other reports.
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