Measurement of the thermal conductivity of fluids with low viscosity under reduced gravity conditions using the transient hot-wire technique

Greger, R.; Rath, H. J.

doi:10.1016/0017-9310(94)00229-o

Cited by 13 publications

(9 citation statements)

References 2 publications

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“…In general, convection is found to lead to higher than expected thermal conductivities which increase with temperature due to the decrease in viscosity leading to greater free convection. 22 However, the thermal conductivity of the ionic liquids was found to decrease with increasing temperature, thus suggesting that convection was not influencing the values obtained.…”

Section: Resultsmentioning

confidence: 87%

Thermal Conductivities of Ionic Liquids over the Temperature Range from 293 K to 353 K

et al. 2007

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The thermal conductivities of 11 ionic liquids were determined, over the temperature range from 293 K to 353 K, at atmospheric pressure, using an apparatus based on the transient hot-wire method. For each of the ionic liquids studied, the thermal conductivities were found to be between (0.1 and 0.2) W·m-1·K-1, with a slight decrease observed on increasing temperature. The uncertainty is estimated to be less than ± 0.002 W·m-1·K-1. In all cases, a linear equation was found to give a good fit to the data. The effects of water content and chloride content on the thermal conductivities of some of the ionic liquids were investigated. In each case, the thermal conductivities of the water + ionic liquid and chloride + ionic liquid binary mixtures were found to be less than the weighted average of the pure component thermal conductivities. This effect was adequately modeled using the Jamieson correlation. Chloride contamination at typical postsynthesis levels was found to have no significant effect on the thermal conductivities of the ionic liquid studied.

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Section: Resultsmentioning

confidence: 87%

Thermal Conductivities of Ionic Liquids over the Temperature Range from 293 K to 353 K

et al. 2007

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“…, 2 cm. As usual [3][4][5][6][7][8][9][10][11][12], probe combines functions of both a heater and a resistance thermometer. Standard reference table for platinum thermometers is implemented for resistance-to-temperature conversio n. A relative version of the method was applied.…”

Section: Methodsmentioning

confidence: 99%

“…The properties of fluids are normally measure d under conditions of small temperature perturbation s. Both stationar y and non-stationar y measure ment techniques have been developed, with the transient hot-wire method being most prevalent [4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Heat transfer under high-power heating of liquids. 1. Experiment and inverse algorithm

Rutin

Smotritskiy

Старостин

et al. 2013

International Journal of Heat and Mass Transfer

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a b s t r a c tA new approach to fluids behavior study in the course of highpower heating has been developed by us. The approach combines experimental method of controlled pulse heating of a wire probe and numerical method of thermoph ysical properties temperature dependencies recovery from the experimental data. Short (millisecond) characteristic time scale allows working with short-lived fluids, including superheated (with respect to the liquid-vapor equilibrium temperature and/or to the temperature of thermal decomposition onset) ones. Numerical method gives a set of inverse heat conductio n problem solutions, based on the results of single pulse experiment. Numerical technique, based on the heat transfer parameters optimization model, is built using genetic algorithms. The approach was applied to saturated hydrocarbons in the temperature range 300-625 K.

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“…These are the reason why we have chosen (contrary to what is usually done for fluids [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]) the "flash" method. Two configurations can be considered: the classical plane geometry (Fig.…”

Section: Problemmentioning

confidence: 98%

Measurement of the Thermal Conductivity and Thermal Diffusivity of Liquids. Part I: “Pure Conduction and an Example of a Solution”

Rémy

Degiovanni

2006

Int J Thermophys

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The measurement of the thermal conductivity of liquids is rather complicated due to the nature of the fluid. To the conduction, which has to be characterized, are added the natural convection, the radiative transfer, and the perturbations caused by the presence of enclosure walls. The goal of this work, composed of two parts, is to implement an experimental bench allowing the measurement of the thermal diffusivity and thermal conductivity of liquids. The first part (Part I) presented here, is about pure conduction and focuses on several aspects involved in this measurement, which will lead one, based on theoretical and practical considerations, to choose a pulse method in a one-dimensional (1D) and cylindrical geometry to solve the problem. In the second section of this part, the problem of the parameters estimation is investigated with the presence of the walls of the measuring cell and this will allow us to define the characteristics of the walls (thickness and thermophysical properties). The entire problem is treated through the thermal quadrupoles method. Finally, in a last section, a setup at room temperature is described. The second part (Part II) of this work that is presented in another paper will show how it is possible to get rid of the convection by a judicious choice of the extension of the measuring cell and how the radiation effects can be taken into account to perform measurements at high temperatures (up to 500 • C).

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Measurement of the thermal conductivity of fluids with low viscosity under reduced gravity conditions using the transient hot-wire technique

Cited by 13 publications

References 2 publications

Thermal Conductivities of Ionic Liquids over the Temperature Range from 293 K to 353 K

Thermal Conductivities of Ionic Liquids over the Temperature Range from 293 K to 353 K

Heat transfer under high-power heating of liquids. 1. Experiment and inverse algorithm

Measurement of the Thermal Conductivity and Thermal Diffusivity of Liquids. Part I: “Pure Conduction and an Example of a Solution”

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