4. Conclusion :
The present numerical study is carried out to estimate the thermal performance of a micro-pin fin heat sink. Heat sinks with three different geometrical shapes (square, triangular, and circular) and three types of PCMs (paraffin wax, stearic acid, and polyethylene glycol) are used to quantitatively visualize their effects on the thermal behavior of heat sinks.  To summarize the research findings, the following points can be drawn to consider: