Accession Number:

ADA455390

Title:

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

Descriptive Note:

Final rept. 1 Jun 2003-31 May 2006

Corporate Author:

THAYER SCHOOL OF ENGINEERING HANOVER NH

Personal Author(s):

• Petrenko, Victor F.

Report Date:

2006-05-31

Pagination or Media Count:

76.0

Abstract:

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.

Descriptors:

• *STRUCTURAL PROPERTIES
• *ADHESION
• *POROSITY
• *ICE
• *CAPACITANCE
• *ICE FORMATION
• MEASUREMENT
• ATMOSPHERES
• WIND TUNNELS
• FREEZING
• TEMPERATURE
• WATER
• MODELS

Subject Categories:

• Atmospheric Physics
• Snow, Ice and Permafrost

Distribution Statement:

APPROVED FOR PUBLIC RELEASE