Accurate Measurement of Temperature Change of Gliding Surface of Ski Associated with Snow Friction

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  • 雪の摩擦に伴うスキー滑走面の温度変化の高精度・高確度計測

Abstract

<p>We performed an experiment to accurately measure the temperature rise of the gliding surface of ski associated with the snow friction in a large cold room at Shinjo Cyrospheric Environment Laboratory. We used an experimental system, which consists of ski, frame, additional weight (0–40 kg), and temperature measuring devices using NTC thermistors inserted into the ski, being dragged by a motor at a constant velocity from 0.1 to 3.0 m/s. The room temperature was varied as -10, -5, and -2℃. As a result, we achieved to accurately measure the gliding surface temperature of the ski. Maximum temperature rises of the gliding surface were 0.8℃ at the additional weight of 20 kg, and 1.0℃ at 40 kg. Additionally, we also performed a numerical simulation to clarify the heat transfer phenomena around the embedded thermistor and investigate the validity of the measuring method. The calculation results indicated that the measuring method can measure the temperature rise of the gliding surface of ski within an uncertainty of the order of 100 mK, depending on the gliding conditions.</p>

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