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Heat Transfer Enhancements in the Flow Channel with Helically Fluted Surfaces
Dae Hee Lee(이대희),Chang Yul Lim(임창율),Dae Keun Lee(이대근),Yun Seok Cha(차윤석) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
Measurements of local heat transfer coefficients in the cooling flow passage of the ventilated disc brake are made. Flat surfaces in the flow passage have been modified to helically fluted surfaces to better dissipate heat caused by the friction between the disc and the pad in braking. Thermochromic liquid crystals and shroud-transient technique were used to accurately measure local heat transfer coefficients. The Reynolds numbers tested are 30,000, 50,000 and 70,000, the helix angle is fixed at 60?°, and the diameter of tube is 7㎝. The results show that the local heat transfer coefficients with helically fluted surfaces are maximum 89.3% to 179% higher than values measured on the flat surface.
반 실린더형 홈을 가진 벤틸레이티드 디스크 브레이크에서의 국소열전달 측정 및 수치 해석
박성봉(Sung Bong Park),임창율(Chang Yul Lim),이대희(Dae Hee Lee),김흥섭(Heung Seob Kim),이관수(Kwan Soo Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
A ventilated disc brake having semi-cylindrical grooves has been proposed to improve the thermal judder by way of heat transfer enhancement. The local heat transfer coefficients were measured in the flow passage of disc brake. These measured local heat transfer data were utilized to do the finite element numerical analysis which predicts the maximum temperatures on the disc brake. The results show that the maximum temperatures on the disc surface with semi-cylindrical grooves are approximately 35.2% lower than those without them.