Experimental study of jet impingement heat transfer with microencapsulated phase change material slurry

Based on the heat dissipation requirement of high heat flux for electronic chips, this paper establishes a closedcycle experimental system and investigates jet impingement heat transfer characteristics with a microencapsulated phase change material (MEPCM) slurry as the working fluid. The phase change properties of the MEPCM particles and the thermal properties of the MEPCM slurry are analysed. The effects of several key parameters on the heat transfer and pressure drop of jet impingement are also discussed. Experimental results show that a 10% mass fraction of MEPCM slurry may enhance jet heat transfer by 32.8% compared with water because of the latent heat absorption of the PCM core. The heat transfer enhancement will be limited for higher mass fractions of slurry. The slurry exhibits a high heat transfer efficiency when the jet distance is Delta L/D = 4-9.3. The convective heat transfer coefficient of the slurry first increases and then decreases as the jet inlet temperature increases, and the optimum jet inlet temperature is approximately 12.1 degrees C lower than the melting peak temperature. Jet temperatures that are too high or too low will lead to deterioration of heat transfer for the slurry. These findings can provide guidance for the design of heat dissipation systems using MEPCM slurries.

Automated summary

This study investigates the heat transfer characteristics and influencing factors of jet impingement heat transfer using MEPCM slurry as the working fluid. Experimental results show that adding 10% mass fraction of MEPCM slurry can enhance heat transfer efficiency by 32.8%, but excessively high or low jet temperatures will deteriorate the heat transfer performance of the slurry.