A new electrodynamic balance design for low temperature 1 studies
نویسندگان
چکیده
15 In this paper we describe a newly designed cold electrodynamic balance (CEDB) system, 16 built to study the evaporation kinetics and freezing properties of supercooled water droplets. 17 The temperature of the CEDB chamber at the location of the levitated water droplet can be 18 controlled in the range: -40 ̊C to +40 ̊C, which is achieved using a combination of liquid 19 nitrogen cooling and heating by positive temperature coefficient heaters. The measurement of 20 liquid droplet radius is obtained by analysing the Mie elastic light scattering from a 532 nm 21 laser. The Mie scattering signal was also used to characterize and distinguish droplet freezing 22 events; liquid droplets produce a regular fringe pattern whilst the pattern from frozen particles 23 is irregular. The evaporation rate of singly levitated water droplets was calculated from time 24 resolved measurements of the radii of evaporating droplets and a clear trend of the 25 evaporation rate on temperature was measured. The statistical freezing probabilities of 26 aqueous pollen extracts (pollen washing water) are obtained in the temperature range: -4.5 to 27 40 ̊C. It was found that that pollen washing water from water birch (Betula fontinalis 28
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In this paper we describe a newly designed cold electrodynamic balance (CEDB) system, built to study the evaporation kinetics and freezing properties of supercooled water droplets. The temperature of the CEDB chamber at the location of the levitated water droplet can be controlled in the range −40 to +40 C, which is achieved using a combination of liquid nitrogen cooling and heating by positive...
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