title: Laboratory ice multiplication experiments in levitated  microdroplets
creator: Pander, Thomas Jan
subject: 530
subject: 530 Physics
description: Ice in clouds is an imporant factor for precipitation, the radiative properties and the  lifetime of clouds. From the freezing of one cloud droplet, more than one ice particle may  result. To investigate these so-called ice multiplication processes, experiments with single  levitated droplets freezing at atmospherically relevant temperatures were conducted.  Two potential processes were found: the fragmentation of a droplet’s ice shell under  growing internal pressure and the emergence of bubbles on the ice surface. It has been  found that solid particles in and on a freezing droplet promote ice multiplication while  solubles inhibit it. A possible link to a highly effective ice multiplication mechanism, the  Hallett-Mossop process, is explored. Additionally, high-speed recordings of the potential  ice multiplication processes and the freezing of droplets allowed for an analysis of the  propagation speed of ice in supercooled water. Furthermore, a technique for droplet size  manipulation in pull-push type droplet generators is presented.
date: 2015
type: Dissertation
type: info:eu-repo/semantics/doctoralThesis
type: NonPeerReviewed
format: application/pdf
identifier: https://archiv.ub.uni-heidelberg.de/volltextserverhttps://archiv.ub.uni-heidelberg.de/volltextserver/18784/1/Dissertation_Thomas_Pander.pdf
identifier: DOI:10.11588/heidok.00018784
identifier: urn:nbn:de:bsz:16-heidok-187847
identifier:   Pander, Thomas Jan  (2015) Laboratory ice multiplication experiments in levitated microdroplets.  [Dissertation]     
relation: https://archiv.ub.uni-heidelberg.de/volltextserver/18784/
rights: info:eu-repo/semantics/openAccess
rights: http://archiv.ub.uni-heidelberg.de/volltextserver/help/license_urhg.html
language: eng