Imaging Temperature and Thickness of Thin Planar Liquid Water Jets in Vacuum
Abstract
We present spatially resolved measurements of the temperature of a flat liquid water microjet for varying pressures, from vacuum to 100% relative humidity. The entire jet surface is probed in a single shot by a high-resolution infrared camera. Obtained 2D images are substantially influenced by the temperature of the apparatus on the opposite side of the IR camera; a protocol to correct for the thermal background radiation is presented. In vacuum, we observe cooling rates due to water evaporation on the order of 105 K/s. For our system, this corresponds to a temperature decrease of approximately 15 K between upstream and downstream positions of the flowing leaf. Making reasonable assumptions on the absorption of the thermal background radiation in the flatjet we can extend our analysis to infer a thickness map. For a reference system our value for the thickness is in good agreement with the one reported from white light interferometry.
Keywords
Cite
@article{arxiv.2304.02967,
title = {Imaging Temperature and Thickness of Thin Planar Liquid Water Jets in Vacuum},
author = {Tillmann Buttersack and Henrik Haak and Hendrik Bluhm and Uwe Hergenhahn and Gerard Meijer and Bernd Winter},
journal= {arXiv preprint arXiv:2304.02967},
year = {2023}
}
Comments
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