晶格波茲曼法是近年來一種具有前景的數值運算方法，本文即利用晶格波茲曼法來模擬低雷諾數、不可壓縮、穩態下的三維彎曲蛇型渠道流場，並藉著在渠道內置入不同形狀的障礙物來探討障礙物對流場的影響，藉由此研究來模擬出真實情形下的三微流動情形，作為提升PEMFC效率的基礎研究。為確保流場的適用性及避免太大的壓縮效應，本文所模擬的雷諾數最大為Re=25。
本文所得到的數值流場結果與已發表的實驗值和數值解相當吻合，成功的利用晶格波茲曼法三維模型來模擬流場。置入障礙物的高低與位置在流場中扮演著擾動的角色，改變了局部區域內流體的流動情形，造成垂直方向流動氣體增強，並在障礙物後方形成迴流區，也造成了壓降與摩擦阻抗的變化。垂直方向的擾動有助於蛇型流道質子交換膜燃料電池中，反應氣體進入氣體擴散層，迴流的形成則有助於移除反應生成水。
在二維空間的紙面上清楚地表達三維空間的事物不是容易的事，尤其要描述一個複雜的流場更為困難。因此本文使用煙線圖、速度向量圖來描述流場，以便讀者觀察在蛇型渠道中流場的現象。

The Lattice Boltzmann Method（LBM）is a kind of great potential for numerical calculation. In this study, the LBM was applied to simulate 3D incompressible steady flow under low Reynolds number in serpentine channel, and analyzes the local influence on flow field caused by inserting different type of obstacles. We simulated the true flow situation in 3D channel to regard as the basic research of improving PEMFC efficiency. In order to restrict the simulations to 3D flows, the investigated Reynolds number range is limited to a maximum value of Re = 25.
The present results obtained for the velocity fields are in good agreement with the published experimental and numerical results. We successful simulated of 3D fluid flow by LBM. The obstacles built in channel with different high and location that play the role of causing interruption within the fluid field. The interruption strengthened the vertical direction gas flow in some area and formed the recirculation region behind obstacles. But it also caused the pressure losses and friction variably. The perturbations of the vertical direction contributed to enhance reactant gas enter the gas diffusion layers and the recirculation region help to remove the water from reaction in serpentine channel PEMFC.
It is not easy to express the 3D flow field in 2D papers. It is more difficult to describe complicated flow phenomena. In order to make it easier for the reader to realize the phenomena, 3D streakline are drawn in this study. Through this study, the reader will realized the fundamental phenomena in 3D serpentine channel.

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