Position Summary/ Research Interest:
research activities centre on the application of phase transitions to moisture deposition in houses and icing phenomena. The objective of the building science work is to predict the amount and distribution of moisture within a building envelope during cold weather. The two specific areas under investigation are wall assemblies and attics. A combined ventilation, thermal, and moisture transport model has been developed to predict the deposition process and has been verified with data obtained in field studies at The Alberta Home Heating Research Facility (AHHRF).
Research on ice phenomena relate to freezing process in rivers, and construction of thick ice platforms. The initial freeze-up of turbulent rivers involves the formation and growth of small ice discs (termed "frazil"). An important aspect of modeling this process is accurate predictions for growth rates as a function of supercooling and turbulence. Numerical calculations for growth rates have been carried out and presently, require experimental verification. Thick ice platforms are used as drilling platforms in the Arctic and winter road beds. The thickening process has been modeled and an improved technique using an ice-water slurry was modeled. This technique showed considerable improvement over the current spraying method with respect to tie required to achieve a specified ice thickness.
Activity in ice phenomena relate to laboratory verification of growth rate predictions for frazil ice under varying supercooling and turbulence. In particular, laboratory tests are planned to vary both turbulence intensity and scale and incorporate these aspects into the growth model.