渠道壁面流體滑移現象對微流道熱沈熱傳的影響

Abstract

隨著流體滑移現象漸漸在微米跟奈米尺度的微流道中被觀測出來，實驗也證實當流體通過疏水性的微流道壁面會在壁面產生滑移的現象。本文以計算流體力學的方法，針對流體通過壁面產生滑移現象和未產生滑移現象進行模擬，也藉由紐賽數跟雷諾數的關係了解在不同水力直徑下，不同形狀的微流道之熱傳行為及產生滑移後的影響。 分析結果顯示具滑移壁面的流道熱傳效果較佳。

Fluid slip has been observed experimentally in micro and nanoscale flow device by several investigators. Some researcher examines a possible mechanism for the measured fluid slip, for water flowing over a hydrophobic surface. In this study, the computational fluid dynamics approach is employed to simulate and analyze the effect of fluid slip at walls on heat transfer. Results are presented in terms of Nusselt number at varies values of Reynolds number for microchannel heat sinks of different shape. Numerical results show that more effective of fluid slip at walls on heat transfer of microchannel heat sink.