Thermal performance of pulsating heat pipe for high power LED thermal management
Pulsating heat pipe(PHP)can effectively solve the thermal management problem of high heat flux electronic components.However,its application is severely limited by its poor adaptability to heat sources with high heat flux in small areas,poor gravity resistance and large contact thermal resistance.In this paper,a butterfly PHP is designed,which has a more compact evaporation section and is suitable for high heat flux in a small area.Taking LED cooling as the application background,the thermal performance of butterfly PHP under different working conditions(heating power,different working fluid,installation angle,liquid filling rate)was studied,and the performance of LED chip thermal management system based on butterfly PHP was analyzed.The results show that under the condition of natural convection condensation,butterfly PHP shows excellent heat transfer performance and temperature equalization,and can meet the thermal management requirements of Bridgelux 100 W LED chip at any installation angle,with the highest thermal resistance not exceeding 0.292 K/W,which has great application potential.Heating power significantly affects the thermal performance of PHP.Increasing the power can restrain the amplitude of wall temperature pulsation and improve the periodicity of wall temperature pulsation.There is a critical power,and the performance of butterfly PHP is better when the heating power is greater than this power and deionized water is charged.Heating power and installation angle both affect the optimal filling rate,and they have certain interaction.
国家科技期刊平台
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