Abstract The application of splitters has been proven to be useful to control the separated wake downstream of the pin-fins. This paper aims to evaluate the thermal ( S th ) and frictional ( S f ) irreversibility rates in the fluid flow inside the plate-pin-fin heatsinks (PPFHSs). To this end, the numerical analysis of forward and backward water flow inside the PPFHS with three different attached splitters was performed considering Re of between 50 and 250. The main objective was to determine the locations with intense thermal and frictional entropy generation rates inside the fluid flow geometry. Based on the results, the frictional entropy generation rate is significantly lower than that the thermal term. Also, the pin-fin with arched splitter has the minimum thermal irreversibilities as compared to straight and wavy splitters. Furthermore, the major irreversibilities are associated with the locations near the pin-fin lateral and frontal surfaces as well as the plate fin walls and heatsink upper case and lower base. Moreover, it was shown that for all considered cases and two flow directions, the increasing of the Re results in decreasing and increasing the thermal and frictional entropy generation rates, respectively.

中文翻译：

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考虑三种不同分流器的板针翅片散热器前后层流水流熵生成分析

摘要 分离器的应用已被证明可用于控制针鳍下游的分离尾流。本文旨在评估板针翅片散热器 (PPFHS) 内流体流动的热 (S th ) 和摩擦 ( S f ) 不可逆率。为此，考虑到 Re 介于 50 和 250 之间，对具有三个不同连接分流器的 PPFHS 内部向前和向后水流进行了数值分析。主要目的是确定流体内部具有强烈热和摩擦熵产生率的位置流动几何。根据结果​​，摩擦熵产生率明显低于热项。此外，与直线和波浪形分流器相比，带有拱形分流器的针翅具有最小的热不可逆性。此外，主要的不可逆性与针翅侧面和正面附近的位置以及板翅壁和散热器上壳和下底座有关。此外，研究表明，对于所有考虑的情况和两个流动方向，Re 的增加分别导致热熵和摩擦熵产生率的降低和增加。