1. By the 1970's it was well recognized that there were at least 6 basic similarity parameters that needed to be considered in performing scaling tests. They were the modified inertia parameter, K0, defined by Langmuir and Blodgett1, the accumulation parameter, Ac, the freezing fraction, n, the water-energy transfer parameter, fa the air-energy transfer parameter, #and the relative heat factor, b. The parameters n, fa and 0 are from the analysis of Messinger,2and b was defined by Tribus.3Different scaling methods match scale values of various parameters to their respective reference values to obtain a set of simultaneous equations that are solved for the required scale test conditions. Charpin and Fasso4were the first to incorporate most of these parameters into a scaling method for sea-level testing facilities. By the mid 1980's Ruff5established that the most faithful scaling resulted when five of these parameters (ignoring b) were matched in a facility with control of test-section pressure. Soon after, Bartlett6'7'8performed a series of analytical and experimental studies to try to determine how important these parameters were to the ice shape. Could any of them be ignored? How closely did each have to be matched to insure an acceptable scaled ice shape?
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3. 314 303 *sh ttoh °c °c -10.8 -5.6 -10.8 -5.6 conditions for each test and the corresponding similarityparameters are shown belowthe data plots.