**6. Conclusion**

Liquid cooling techniques in heat sinks have been using to increase the heat transfer rate in electronic devices. The performance of the heat sink is affected by some parameters. Geometry parameters (shape of the cross-section, pattern, manifolds) and flow parameters (working fluids and boiling) are the most common methods for enhancing the thermal–hydraulic performance of micro pin-fin/ microchannel heat sink. Effective parameters are divided into two parts Geometry parameters and Flow parameters.

	- a. pattern: It was found that changing the channel flow path leads to generating the phenomena such as secondary flows in the channel cross-section that result in improving thermal performance. The previous data demonstrated, the geometric parameters play a significant role in heat sinks' performance
	- b. Cross-section: rectangular cross-section presents maximum performance compared to other microchannels heat sinks. While in micro pin-fins, it is impossible to conclude precisely the best crosssection due to the different operating conditions.
	- c. Manifold: it concludes that flow and temperature maldistribution should be reduced along the microchannel to reach the ideal flow distribution for obtaining optimal performance. Also, other parameters are crucial as well, such as header shape, inlet configurations (vertical and horizontal flow inlet/outlet), inlet/outlet arrangements (I, Z, C, S, V, and U-types), location of inlet/outlet.

*Effective Parameters on Increasing Efficiency of Microscale Heat Sinks and Application… DOI: http://dx.doi.org/10.5772/intechopen.96467*
