关键词:

热控制单元, 泡沫复合相变材料, 传热模型, 空穴, 等效热容法

Abstract:

Due to the advantage of large latent heat and isothermal behavior during the phase change process, solid-liquid phase change material (PCM)can be well applied in the passive thermal design for thermal control unit (TCU)of portable electronic devices.However, PCM has a major drawback of low thermal conductivity, leading to low charging and discharging rates and bad TCU performance.Therefore, it is necessary to enhance the PCM conductivity to improve the TCU thermal performance.A two-dimension mathematical model of TCU filled with foam-PCM composite material (FCPCM)was presented, and numerical simulation was conducted to analyze the TCU thermal performance.The effect of void was considered in the numerical model for FCPCM heat transfer and equivalent capacity method was used to handle PCM phase change process.The thermal performance of TCU filled with FCPCM was compared to that with fins.Further, the effects of some important parameters on TCU thermal performance were investigated numerically, such as foam porosity, heat source power and foam matrix material.The results show that the FCPCM with aluminum matrix can greatly improve the TCU performance, and the design can provide a reliable solution to electronic thermal control.

Key words:

热控制单元, 泡沫复合相变材料, 传热模型, 空穴, 等效热容法