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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/65982

    Title: 奈米結構於微流道表面之池沸騰熱傳影響研究
    Authors: 彭紳泰;Peng,Shen-tai
    Contributors: 機械工程學系
    Keywords: 奈米結構表面;微流道表面;流道寬度;鰭片寬度;池沸騰熱傳
    Date: 2014-08-11
    Issue Date: 2014-10-15 17:19:52 (UTC+8)
    Publisher: 國立中央大學
    Abstract: 本研究以甲醇為工作流體在一大氣壓下進行實驗探討奈米結構於微流道表面之池沸騰熱傳影響,實驗結果分為平滑表面、微流道表面、奈米結構於微流道表面之池沸騰熱傳,共三部份做探討。其中微流道表面以及微流道表面有奈米結構之探討參數則分為不同流道寬度(300 µm V.S. 400 µm)及不同鰭片寬度(300 µm V.S. 400 µm)進行探討。
    ;In this research work, saturated pool boiling experiment is carried out to study the effect of Nanostructure on silicon microchannel surface. Methanol is used as working fluid at atmospheric pressure. Mainly three types of surface was prepared, namely, Plain surface, surface with microchannel and nanostructured microchannel surface. The effect of micro channel width (300 µm & 400 µm) and fin width (300 µm & 400 µm) are studied on both surface.
    The experimental results shows at lower heat flux, wider micro channel performs better in terms of enhancing heat transfer coefficient. Because the bubble diameter is bigger in wider channel. In the case of fin width, thicker fin performs better at lower heat flux because the probability of bubble coalesce between neighbor channels is less and as a result of that bubble departure frequency is higher.
    With respect to plain surface, microchannel surface has larger size cavities, so at given low heat flux, it has more active nucleation sites. Where as in higher heat flux there is not much heat transfer enhancement on microchannel surface, since nucleation sites on flate surface are active.
    Nanostructured micro channel surface has higher contact angle. As a result of that at a given heat flux, the number of nucleation sites is more. So the pool boiling heat transfer enhancement is better compare to microchannel without nanostructure surface. Similar enhancement trend has been observed while in comparing the effect of fin width and microchannel width. The CHF of nanostructured surface is lower because hither nucleation site density result in more bubble coalesce and dry out.
    Key word: Nanostructure surface, microchannel surface, fin width, channel width, pool boiling heat transfer.
    Appears in Collections:[機械工程研究所] 博碩士論文

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