A computational and experimental investigation of the metallisation effects on the thermal characteristics of an automotive exterior lighting lamp
by Sercan Boduroglu; A. Alper Ozalp
International Journal of Vehicle Design (IJVD), Vol. 71, No. 1/2/3/4, 2016

Abstract: This study was performed to describe the reflector metallisation effects considering the heat transfer characteristics and hot spot formation on an automotive exterior lamp. To form an accurate comparison, three reflectors were studied with emissivities of ε₁ = 0.04, ε₂ = 0.42 and ε₃ = 0.95, which indicated the aluminium-coated, uncoated white and uncoated black reflectors, respectively. The discussion section is organised to address the numerical evaluations using computational fluid dynamics (CFD) and the experimental evaluations. The computational results indicated that, despite the variations in h_conv and h_rad with ε, the total heat transfer coefficients on the bulb's surface result in a constant value. Additionally, it is observed that the hot spot location on the lens moves to the centre area for a lower reflector emissivity (ε₃→ ε₁) as the radiation approaching the lens becomes more effective on the lens's temperature distribution. The numerical and experimental results are compared, and a good agreement is found between them.

Online publication date: Fri, 02-Sep-2016

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