The main objective of the present paper is to investigate the effect of using connecting holes on the hydrothermal performance and irreversibility behavior of laminar forced convection flow of a nanofluid (NF) inside a microchannel heat sink (MCHS). The biologically synthesized silver/water NF is employed as coolant. The influences of the volume concentration of NF (φ), the Reynolds number (Re) and the number of connecting holes on the performance features of MCHS and NF are considered numerically. It was observed that the CPU temperature is reduced and became more uniform due to boosting of Re and φ, and the consequence augmentation of the convective heat transfer. However, the pumping power and frictional irreversibility get raised as Re and φ are increased. The figure of merit is above unity for all Re and φ which indicate that the utilization of connecting holes is a suitable option to improve the MCHS performance from the first-law point of view. The heat transfer irreversibility, however, increased by using the connecting holes. Also, the merit of NF over the pure water is observed for Re of 500 and 2000 and φ of 0.1% and 1%.

本文的主要目的是研究使用连接孔对微通道散热器（MCHS）内的纳米流体（NF）的层流强迫对流的水热性能和不可逆行为的影响。生物合成的银/水NF被用作冷却剂。从数值上考虑了NF（φ）的体积浓度，雷诺数（Re）和连接孔数对MCHS和NF性能特征的影响。观察到由于Re和φ的升高，CPU温度降低并且变得更加均匀。，对流换热的结果也随之增加。但是，随着Re和φ的增加，泵送功率和摩擦不可逆性会增加。所有Re和φ的品质因数均大于1，这表明从第一定律的角度来看，利用连接孔是提高MCHS性能的合适选择。但是，通过使用连接孔，传热不可逆性增加了。而且，在Re为500和2000且φ为0.1％和1％时，观察到NF在纯水上的优点。