Hydrostatic Weighing Method in Application to Model Ice Density Measurements

Model ice, which is used nowadays in ice tanks, has a soft bottom layer. This obstructs defining ice specimen volume without special equipment. The application of usual mass/volume method may lead to a significant error and scatter of results. The paper analyzes the method of hydrostatic weighing for model ice density measurement (method C from the corresponding ITTC recommendations). This method allows calculating density with the use of weighing scales and water basin only. Hand submerging of the specimen was applied, so no additional installations were demanded. To study the observational error, preliminary experiments with monophase paraffin specimen were performed. The formula of density used in hydrostatic method was expanded to Maclaurin series. Influence of observational error in the third weighting of method C tends to decrease with increasing of the specimen mass. With careful performance this type of error can contribute less than 3 kg/m³ to resulting density value when using specimen of about 1 kg mass. The speed of brine drainage from model ice specimens was investigated. Fine Grain model ice fields in Krylov State Research Centre ice tank were used. The amount of drained water in the first minute is found to be governed by logarithmic law. With increasing mass of the specimen the velocity of drainage increased. After submersion of the specimen the velocity of drainage increased as well. The brine drainage can subtract 4 kg/m³ from density value in the first 30 seconds when measuring 0.035 m thick model ice specimen of about 1 kg mass.

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  • English

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  • Accession Number: 01745153
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 2 2020 12:28PM