Abstract
M.Ing. (Mechanical Engineering)
In snow shooting, pressurised liquid carbon dioxide is injected
via a lance into a permeable snow bag mounted near the ceiling of an
insulated transport container. The decrease in pressure causes the liquid
carbon dioxide to convert to "snow" and vapour inside the snow bag.
The snow bag acts as a phase separator, allowing the sublimated snow
to cool down the products inside a container. In this thesis the heat
transfer coefficients of such a snow bag were determined
experimentally and theoretically. It was found, that on average the
measured heat transfer coefficient was 31% lower than the theoretical
prediction. The theoretical model was used to correlate the
experimental heat transfer coefficient as function of snow height. With
this correlation it was possible to predict the time of the snow life to
within 24%.