建立了固体激光微通道冷却器数学模型，运用商业软件Fluent进行求解计算，并与文献中数据进行对比，验证了模型的可靠性。分析微通道尺寸及结构对转捩雷诺数影响，结果表明：微通道当量直径对于转捩雷诺数影响甚微，收缩比的大小是引起转捩雷诺数不同的关键因素,最终确定了不同收缩比下的转捩雷诺数。

A mathematical model was developed in describing flow behaviors of a microchannel cooler of solid-state laser. The model was solved numerically using the commercial software, Fluent, and the effect of microchannel size and structure on the transition Reynolds number (Rec) was analyzed. Comparison between model prediction and experimental data in literature shows a good agreement, which verifies the reliability of the model. The results also show that the equivalent diameter has little effect on Rec. The magnitude of the transition Rec depends largely upon the contraction ratio. The Rec s under different contraction ratios were determined.