Item: Study on Friction Characteristics of Snow Using Rotary Drum Device
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Title: Study on Friction Characteristics of Snow Using Rotary Drum Device
Proceedings: International Snow Science Workshop Proceedings 2018, Innsbruck, Austria
Authors:
- Kenichi Oda [ Nihon University, Tokyo, Japan ]
- Katsuhisa Kawashima [ Niigata University, Niigata, Japan ]
- Yoshikazu Kobayashi [ Nihon University, Tokyo, Japan ]
- Katsuya Nakamura [ Japan Nuclear Fuel Limited, Aomori, Japan ]
Date: 2018-10-07
Abstract: Many numerical analysis methods for predicting the motion of the soil or snow avalanches set the characteristics of static friction obtained from the mechanical tests such as triaxial compression test and direct shear test. However, the friction characteristics of objects actually flowing on the slope are influenced by changes in velocity and density of flowing objects and are not necessarily constant. In this study, in order to understand the friction of snow, the experiment occurred using rotary drum device with the flowing snow. In addition, particle image velocimetry (PIV) was used to extract the flow velocity of the object flowing in the rotary drum device. On the other hand, the authors have proposed a method to solve avalanche movement by solving flowing avalanche as fluid and solving based on continuum dynamics. Currently, the authors are developing a method for estimating the frictional characteristics occurring inside the flow from the flow velocity of fluid object obtained from image analysis. Therefore, we examined a method to understand the friction characteristics of the snow by observing the snow sample flowed in the rotary drum device. In this study, we did to calculate the friction coefficient using by estimate equation of friction based on fluid analysis model and the time series data of flow velocity distribution. As a result, it was confirmed that although the value evaluated excessively compared with the general internal friction angle is calculated, the friction coefficient affects the flow velocity as a tendency.
Object ID: ISSW2018_P01.15.pdf
Language of Article: English
Presenter(s):
Keywords: friction characteristics, rotary drum device, PIV, fluid dynamics.
Page Number(s): 89-93
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