磁性奈米流體於微管道內永磁驅動流之研究

Study on the permanent-magnetically-driven flow of magnetic nanofluids in a microtube

張文昱(Wen-Yu Zhang)

指導教授 ： 翁輝竹

中原大學/工學院/機械工程研究所/碩士(2016年)

https://doi.org/10.6840/cycu201600499

摘要

本論文完成磁性奈米流體於微管道內永磁驅動流之研究。主要目的在探討
粒子體積分率、磁場梯度與磁盤轉速對微管道內磁驅動力之影響。首先，我們
完成水基磁鐵礦(Fe3O4)奈米流體之製備與材料性質之實驗量測。接著，提出磁
驅動力之理論公式，並透過實驗驗證該公式之合理性。最後，透過流率實驗數
據與磁驅動力公式計算以進行磁性奈米流體於微管道內永磁驅動流之特性分
析。
實驗結果發現，磁驅動力會隨著粒子體積分率、磁場梯度及磁盤轉速上升
而提升，隨著上升的值越高，提升的值將漸趨平緩。此外，磁盤與微管道的距
離越短，磁驅動力的提升越趨明顯，並且提升的幅度相當劇烈。所有結果在較
粗的微管道中有較明顯的變化趨勢。

關鍵字

磁性奈米流體 ； 微流體學 ； 智慧型奈米材料 ； 磁控元件

並列摘要

This study conducts a research of permanent-magnetically-driven flow of
magnetic nanofluids in a microtube. The main purpose is to investigate the influence
of volume fraction of particles, magnetic field gradient, and magnetic disk rotational
speed on the magnetic driving force in the microtube. First, water-based magnetite
(Fe3O4) nanofluids are prepared, and experimental measurements of their material
properties are made. Further, the theoretical formula of magnetic driving force is
provided, and some experiments are done to verify the validation of the formula.
Finally, the analysis of the characteristics of the permanent-magnetically-driven flow
of magnetic nanofluids in a microtube is conducted through experimental data of the
volume flow rate and calculations of the magnetic driving formula.
Experimental results are found that the magnetic driving force increases with the
increase in the particle volume fraction, magnetic field gradients, and magnetic-disk
rotational speed. At higher values of these parameters, the increasing becomes slowly.
Moreover, the magnetic driving force increases dramatically with the decrease in the
distance between the magnetic disk and the microtube. All magnetic effects could be
magnified in a larger microtube.

並列關鍵字

magnetic nanofluids ； microfluidics ； smart nanomaterials ； magnetically controlled devices

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