Abstract
Thermalization experiments performed in a weak acceleration field (as provided in \(\text {SF}_{6}\) at liquid-like density by manoeuvres, rotations and positioning corrections of a Space Shuttle) and on Earth (\(\text {CO}_{2}\) at gas-like density) are presented in a configuration close to most situations currently encountered in an industrial context. The sample fluid is filled in an interferometer cell with its walls maintained at constant temperature. When heat pulses are applied in the centre of the fluid by a thermistor, a long thermal transient is observed where the bulk fluid temperature reaches significantly below the initial temperature. This unconventional cooling originates from the fast decompression of the fluid, as induced by the rapid convectively disappearing hot boundary layer at the heat source. The effect is also more pronounced when the free fall acceleration is large. The result are analysed by using a simple one-dimensional model with ad hoc convective heat losses.
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Zappoli, B., Beysens, D., Garrabos, Y. (2015). Experiments in a Weak Acceleration Field and on Earth. In: Heat Transfers and Related Effects in Supercritical Fluids. Fluid Mechanics and Its Applications, vol 108. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-9187-8_14
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DOI: https://doi.org/10.1007/978-94-017-9187-8_14
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