An experimental investigation of fluid flow and wall temperature distributions in an automotive headlight

A review on light-emitting diode based automotive headlamps

“…Thus as the time goes by, its performances potentially occur degradations and even catastrophic failures, socalled the reliability issue and lifetime, of which the oxidizing of electrical connections [79], freezing on front lens, color shift [80,81], lumen depreciation [82], unstable output or no light output are typical phenomena. The reliability means the probability to repair or replacement, while lifetime is the time length of service.…”

“…a statistics-based uniform parameter design from Hella, Germany [10]. Many experiments, such as the thermal measurement of a plastic-made housing case or lens using thermocouples, IR-thermograph or laser-Doppler velocimetry [79,89], the junction temperature measurements with the forward voltage based direct method or thermal resistance based indirect method [36,90] and so on, have been done to reach a more accurate assessment of them.…”

Effect of automotive headlamp modeling on automotive aerodynamic drag

“…As correlation in shape and position between zygomorphic side comers of headlamp and forebody, the two could be considered as integration to study the effect on automotive aerodynamic drag. small, or else, there will form acute angle and long and narrow region near the point A much easily, condensing on internal surfaces of headlamp cavities [9]. This is undesirable as it may have an impact on both the normal operation of the headlamp and its aesthetic appearance [10].…”

Cooling analysis of a light emitting diode automotive fog lamp

“…In the work of Christensen and Graham [7] a very simple fin geometry was numerically investigated using constant heat transfer coefficients calculated using standard correlations for a natural and forced convection heat transfer regime. A detailed experimental measurements of the wall temperatures and fluid flow velocities inside an automotive headlight using laser doppler anemometer was performed by Sousa et al [8]. The steady-state operating regime was characterized as a vortex-dominated flow.…”