本研究旨在以實驗量測的方式探討奈米流體流經一微流道熱沉時強制對流熱傳遞特性。實驗所用的微流道熱沉係在紅銅方塊上加工成形，具有25條長度 、寬度 、深度 的矩形流道。本文的奈米流體為純水和氧化鋁( )奈米微粒混合而成。本實驗係針對微粒體積濃度 和 之奈米流體其雷諾數分別介於332 1641與371 938條件下測得微流道熱沉之磨擦因子、紐賽數、及熱阻等結果。實驗結果顯示，以奈米流體取代純水，可顯著提升微流道熱沉之對流熱傳係數，進而有效地降低其熱阻。同時，奈米流體流經微流道熱沉孔壓降相較於純水僅呈現些微上揚。

In the present study, the forced convection heat transfer characteristics of a micro-channel heat sink were studies experimentally to explore efficacy of using alumina-water nanofluid as the cooling fluid in addition to water. The heat sink was fabricated from copper and consists of an array of 25 rectangular micro-channels, each of which has a width of 283 m, a depth of 800 m, and a length of 50 mm. The friction factor, Nusselt numbers, and thermal resistances for the micro-channel heat sink with a uniform base temperature were determined for the Reynolds number ranged from 332 to 1641 and 371 to 938 for the nanofluid containing alumina particle fraction of 1 vol.% and 2 vol.%, respectively. Experimental results obtained show that using the nanofluid, in comparison with those of water, can enhance the heat transfer rate and thus reduce the thermal resistance of the micro-channel heat sink. Meanwhile, the friction factor the micro-channel sink was found slightly increased for using the nanofluid.

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