CIESC Journal ›› 2024, Vol. 75 ›› Issue (S1): 126-134.DOI: 10.11949/0438-1157.20240556

• Fluid dynamics and transport phenomena • Previous Articles     Next Articles

Thermal performance of pulsating heat pipe for high power LED thermal management

Xinze LI(), Shuangxing ZHANG, Guanyu REN, Rui HONG, Wenjing DU()   

  1. School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China
  • Received:2024-05-26 Revised:2024-07-04 Online:2024-12-17 Published:2024-12-25
  • Contact: Wenjing DU

大功率LED热管理用脉动热管热性能

李新泽(), 张双星, 任冠宇, 洪瑞, 杜文静()   

  1. 山东大学能源与动力工程学院,山东 济南 250061
  • 通讯作者: 杜文静
  • 作者简介:李新泽(2000—),男,硕士研究生,lxz2023@mail.sdu.edu.cn
  • 基金资助:
    山东省科技型中小企业创新能力提升工程项目(2022TSGC2213)

Abstract:

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.

Key words: pulsating heat pipe, thermal management, heat transfer, flow, experimental validation

摘要:

为满足大功率LED芯片的热管理需求,设计了蝶形脉动热管(pulsating heat pipe,PHP),实验研究了不同工况下(加热功率、工作流体、安装角度、充液率)的传热性能,基于热阻法分析了蝶形PHP的热管理性能。结果表明,自然对流冷凝工况下,蝶形PHP表现出优秀的传热性能和均温性,任意安装角度下,均能够满足Bridgelux 100W LED芯片的散热需求,热阻不超过0.292 K/W,最低可达0.174 K/W,均温性系数低至0.263。加热功率显著影响PHP的传热性能,提高功率能够抑制壁温脉动幅度,增强脉动周期性。存在一个交叉功率,大于此功率后充注去离子水的蝶形PHP性能更好。加热功率和安装角度均会影响最佳充液率,二者具有一定的交互作用。

关键词: 脉动热管, 热管理, 传热, 流动, 实验验证

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