The convective heat transfer characteristics on outside surface of vehicle brake disc
| Autor: | Yuan Wu, Qiuwang Wang, Xing Jin, Mei He, Liang-Bi Wang, Lu Wang, Yong-Heng Zhang |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Convective heat transfer 020209 energy 02 engineering and technology Heat transfer coefficient 010502 geochemistry & geophysics 01 natural sciences law.invention Physics::Fluid Dynamics symbols.namesake law Brake 0202 electrical engineering electronic engineering information engineering Astrophysics::Solar and Stellar Astrophysics Disc brake Parking brake 0105 earth and related environmental sciences General Engineering Reynolds number Mechanics Condensed Matter Physics Nusselt number Classical mechanics Heat transfer symbols Astrophysics::Earth and Planetary Astrophysics |
| Zdroj: | International Journal of Thermal Sciences. 120:366-376 |
| ISSN: | 1290-0729 |
| DOI: | 10.1016/j.ijthermalsci.2017.06.020 |
| Popis: | The brake disc of a high-speed train can produce huge heat in the process of steep brake or parking brake. Thus the heat transfer characteristics of the high-speed train brake discs are the basic information needed to design them. The main works of the present paper are to establish a flow model that is similar to the actual brake disc working conditions, and to obtain the local and average convective heat transfer characteristics of the outside surface of vehicle break disc experimentally. The naphthalene sublimation technique of heat/mass transfer analogy method is used. The significant result is that the diameter ratio of the brake disc to the wheel determines the convective heat transfer characteristics on the vehicle's brake disc outside surface. Due to the influence of the ground, the average Nusselt number on the surface of a break disc is larger than that of a rotating disc in crossflow at the same Reynolds number. The local Nusselt number on the surface of a break disc decreases along the radius direction. The correlations of the local and average Nusselt numbers, Reynolds number, and the diameter ratio of brake disc to wheel are established. The average Nusselt number is larger than that on the surface of a rolling wheel at the same Reynolds number. |
| Databáze: | OpenAIRE |
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