Photothermal measurement of the thermal conductivity of supercooled water

Abstract

Thermal diffusivity measurements of supercooled water have been performed between + 40 °C and - 23 °C, using both optically induced periodic and pulsed heat source in two separate experiments. The resulting temperature field is analysed by monitoring the deflection of a He-Ne laser beam. The thermal conductivity, λ, as deduced from the experiments, decreases continuously with decreasing temperature. The analysis of λ is also discussed both in terms of the classical expression and in terms of a critical law. The influence of the hydrogen bond network structure is discussed, as well. It is verified that the classical relations between λ and the sound velocity, c, are respected, and consequently that the hydrogen bond network structure has the same influence over both λ and c

Subwavelength infrared spectromicroscopy using an AFM as a local absorption sensor

“…A temperature profile develops in the sample via heat diffusion. If we consider this profile a time s after the beginning of the laser pulse, the temperature profile, can be described [14] by a thermal diffusion length, l d .…”

Communication: Minimum in the thermal conductivity of supercooled water: A computer simulation study

“…6 we show a comparison between the simulated values of the thermal conductivity ( Fig. 6(a)) and the experimental thermal conductivity data of real water 37,38 ( Fig. 6(b)) at p = 0.1 MPa.…”

Automation and Heat Transfer Characterization of Immersion Mode Spectroscopy for Analysis of Ice Nucleating Particles

“…In summary, the Automated Ice Spectrometer: † Kell, 1975† † Dehaoui, 2015* Benchikh, 1985 Atmos. Meas.…”

“…is the coefficient of thermal expansion, is the temperature of the water volume, is the temperature of the air at the surface of the water volume, is the diameter of the well as measured at the top of the well of the disposable sample tray, is dynamic viscosity, and is the thermal diffusivity Since , , , and k are temperature dependent properties, and is of interest over the supercooled range from 0 to -25 °C, and were calculated at -5°C, -15 °C, and -25 °C, using corresponding values of , , , and k (Kell, 1975;Dehaoui et al, 2015;Benchikh et al, 1985;Biddle et al 2013), which are shown in Table 2. Thus, was estimated to be 161, 191, and 202 W/m 2 K at -5°C, -15 °C, and -25 °C, respectively.…”