In-Situ Study of Physical Properties and Structure of Atmospheric Ice

• Main Author: Petrenko, Victor F.
• Other Authors: THAYER SCHOOL OF ENGINEERING HANOVER NH
• Format: Text
• Language: English
• Published: 2006
• Subjects: Atmospheric Physics; Snow; Ice and Permafrost; *STRUCTURAL PROPERTIES; *ADHESION; *POROSITY; *ICE; *CAPACITANCE; *ICE FORMATION; MEASUREMENT; ATMOSPHERES; WIND TUNNELS; FREEZING; TEMPERATURE; WATER; MODELS; *ATMOSPHERIC ICE; *ADHESION STRENGTH; *VOLUMETRIC LIQUID FRACTION; ICE ACCRETION; WATER CONTENT; CONDUCTANCE; ICING WIND TUNNELS; TIME-VARIATIONS; Ice; permafrost
• Online Access: http://www.dtic.mil/docs/citations/ADA455390; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA455390

This project focused on the following in situ measurements of the physical properties and structure of atmospheric ice during its growth to add to the fundamental data of atmospheric icing. (1) A new approach to determine the volumetric liquid fraction in growing atmospheric ice from in-situ measurements of capacitance and conductance was proposed. Assuming a combination model of series and parallel connections between water and ice parts of atmospheric ice, we were able to determine the time-variation of the liquid fraction from the in-situ measurements. (2) A simple technique for measuring the adhesion strength of atmospheric ice to a stainless wire during ice growth was developed and conducted. Data analysis shows that the freezing process, related to the ice temperature and the phase change of water, and the porosity of ice affect the ice adhesion. Those two factors can explain the experimental data. The original document contains color images.