Numerical investigation the performance of micro channel heat sink with different cooling mediums

Abstract

This study aims to study the effect of different cooling fluids (pure fluids, Nanofluids and microencapsulated phase change materials suspensions) and the cooling performance of rectangular micro-channel heat sink. Three types of Nanofluids (Al2O3-water, Cu-water,Tio2-water), three types of microencapsulated phase change materials suspensions(MEPCM) are(RT44-water, paraffin wax water, n-octed-water ) and three pure fluids ) Water, Oil ,Ethylene Glycol ) were used with constant heat flux(100 W /cm 2 ) applied on the base of heat sink. The volumetric concentrations of Nanofluids and MEPCM suspensions (1%, 3%, and 5%) and (100 to 900) is the range of Reynolds number used in this study. The results showed that, using different types of Nanofluids and MEPCM suspensions lead to enhance the cooling performance of the micro channel heat sink (MCHS), since it lead to increase the heat transfer compared with pure fluids. The heat transfer in (MCHS) for MEPCMs is higher than that for Nanofluids. Also, the performance of heat sink increases with increase the concentration of Nanofluids and MEPCMS at certain volumetric concentration. Additionally, the pressure drop for MEPCM suspensions and Nanofluids increased compared with pure fluids.

Analysis of heat transfer enhancement in microchannel by varying the height of pin fins at upstream and downstream region

“…Mushtaq et al. 40 used three different types of pure fluids, nanofluids and microencapsulated phase change material suspensions respectively to investigate the performance of the microchannel with fins or without fins of various shapes numerically. Yadav et al.…”

“…Turker et al 39 analyzed the performance of single miniature sized fin of various shapes with the same chord diameter on low Reynolds number ranging from 20 to 120. Mushtaq et al 40 used three different types of pure fluids, nanofluids and microencapsulated phase change material suspensions respectively to investigate the performance of the microchannel with fins or without fins of various shapes numerically. Yadav et al 41 examined the three distinct setups of fins in microchannel and concluded that the fins at upstream region are more effective than at the downstream region and complete finned arrangement while Owais et al 42 attempted to explore the outcome of variation of height of pin fins by considering the microchannel with increasing and decreasing height of pin fin and compared it with plain rectangular microchannel.…”