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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-474-8

ISBN Online: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

COOLING FLOW BEHAVIOUR IN A WIRE-WOVEN BULK DIAMOND (WBD) VENTILATED BRAKE DISC

Get access (open in a dialog) DOI: 10.1615/IHTC16.cov.023002
pages 3525-3533

Abstract

The surface temperature of the wire-woven bulk diamond (WBD) disc has been shown to be significantly lower (e.g., ~ 12.6% at 200 rpm) than the pin-finned brake disc under continuous, steady-state braking. Despite this improved cooling performance, the fluidic behaviour related to the reduced surface temperature of the WBD disc is not fully understood. This study experimentally compares the rotating cooling flow behaviour within the ventilated channel of conventional pin-finned and WBD brake discs used on heavy vehicles. The results demonstrate that the WBD core provides more pumping through the ventilated channel than the pin-finned brake disc (~ 6%) due to the substantially increased wetted surface area (approximately 3 times the conventional pin-finned brake disc). However, the absolute velocity magnitude of the flow discharged from the WBD brake disc is (~ 18 %) less than the pin-finned brake disc, due to the increased porosity of the WBD disc. The wakes behind the WBD ligaments are narrower than the wakes behind the pin fins (i.e., Wwake,WBD ~ 0.5Wwake,pinfin); this reduction in inactive thermal area contributes to the improved cooling performance of the WBD lattice core. The demonstration that larger recirculation zones inhibit heat dissipation and conversely smaller wake regions are favourable for brake disc cooling is an important consideration when designing the topology of brake discs.