A Feasibility Study About Using SiO₂Nanofluid Screen Mesh Wick Heat Pipe for Cooling of High-Power LEDs

Abstract

Effective and timely heat removal of high-power Light emitting diodes (LEDs) is crucial to their performance and lifetime. The strategy about using a screen mesh wick heat pipe with SiO 2 nanofluid as the working fluid for LED heat dissipation was comprehensively evaluated. An experimental system is set up to study the heat transfer performance of the heat pipe. The obtained experimental results give optimal conditions/parameters for the heat pipe: 60% charging ratio, 30 incline angle, and 1wt% concentration of the nanofluid. Compared with the heat pipe using the secondary distilled water as the working fluid, the thermal resistance of the heat pipe using the SiO 2 nanofluid as the working fluid is generally reduced by around 35-40% for the investigated heat load range: 1-60 W. Based on an equivalent heat conductivity of the SiO 2 nanofluid heat pipe derived from the experimental results, an Icepak modeling effort to the cooling system of a 60 watt LED lamp is then expended. The numerical results show that the temperature of the LED lamp remains low and quite uniform across the LED chip region, indicating the technical feasibility of using this class of heat pipes for cooling of high-power LEDs.

Current research aspects in mono and hybrid nanofluid based heat pipe technologies

“…Wang et al. [56], experimentally, studied screen mesh heat pipe using SiO 2 nanofluids for high power LED (Light emitting diodes). Suspending SiO 2 nanoparticles in DI water and stirred for ultrasonic vibration bath about 10 hrs was used for preparation (Two step method).…”

“…[42] maintained 19.97, 12.38, 7.45 kPa, Wang et al. [56] worked with 26–30 kPa, Chen et al. [90] used 7.38, 15.75, 31.18 kPa, Venkatachalapathy et al.…”