Abstract
In the materials of the article, the following issues were examined: border heat layer and its role in the efficiency of convective heat exchange; interaction of dynamic border layer with heat layer in processes of the airflow around surfaces; heat transfer from metal brake friction elements. It has been established that the «longevity» of the boundary dynamic and thermal layers of the surrounding air-heated surfaces of metallic friction elements at the open brake friction pairs are different. What unites them is that the boundary heat layer «sticks» to the metal surface, and the dynamic boundary layer «sticks» to the bottom of the main flow of the surrounding air. The frequency of application of the brake is the main factor in the break-up of the boundary heat layer of the air, which is a kind of insulator for convective heat exchange. The rotation speed of metallic friction elements during injections and open brake friction pairs determines the laminar or turbulent mode of washing with air streams of their surfaces. The dependencies of the total coefficient of resistance (C) on the Reynolds number (Re) during the longitudinal washing by the flow of air with a variable angle of attack (45–125°), the outer surfaces of the rim of the pulley, and the brake drum are determined, By separating zones of constant and significantly decreasing values of coefficient C. The method of calculating heat transfer coefficients which are «closing» in estimating heat transfer coefficients, has been developed.
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Skripnik, V., Vudvud, O., Zhuravlev, D., Nikipchuk, S., Danulyak, T. (2023). The Efficiency of Convective Heat Exchange at the Airflow of Metal Friction Elements of Brakes. In: Tonkonogyi, V., Ivanov, V., Trojanowska, J., Oborskyi, G., Pavlenko, I. (eds) Advanced Manufacturing Processes IV. InterPartner 2022. Lecture Notes in Mechanical Engineering. Springer, Cham. https://doi.org/10.1007/978-3-031-16651-8_54
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