磁性流體磁化表面張力之研究

Using O-Ring Pulling Method to Predict Ferro-Surface Tension

何正義(Je-Ee Ho) ； 郭文堯(Wen-Yao Kuo) ； 林建勳(Jian-Xun Lin)

《國立宜蘭大學工程學刊》 9期 (2013/12) Pp. 26-37

https://doi.org/10.6176/BCE.2013.09.12

摘要

本文將利用O型拉環法以探討磁性流體表面張力之研究，而實驗表面張力可藉由上拉試驗樣品之視重減少量而進行估算；此亦將取決於磁流樣品於磁場作用下產生之磁化強度而定。然實驗測試之結果將與Rayleigh公式求得之理論數據作進一步之比對。為呼應磁流表面張力實驗之要求，一套簡易、經濟用於估算磁性流體表面張力係數的小型拉環實驗機構將於此設計並建構完成。經以松本公司的磁流商業用品於工作磁場強度0~40mT區間進行實驗測試與理論分析，兩者結果顯示了相當吻合的趨勢。另於此發現磁流樣品體積濃度與外加磁場強度交互作用之效應將誘導磁流體之表面張力；亦即決定了磁流體之物理特性。

關鍵字

磁性流體表面張力

並列摘要

An O-Ring Pulling Method to predict the surface tension of ferrofluid is investigated in this study. Here the experimental surface tension, based on the ferro-weight loss of testing ample lifted up, is strongly dependent on the magnetic intensity and ferro-magnetization. And which could be further confirmed by analytic solution estimated from Rayleigh theory. To conduct the ferro-experiment of surface tension, a self-designed ring-pull mechanism with magnetic field action considered is then set up. That also features as a special faculty of smaller size, economics and efficient operation. After compared with the empirical and theoretic results using commercial ferro-sample provided by Matsumoto co., an excellent agreement, for ferro-concentration 0.03 and 0.003, will be delivered within the working magnetic intensity 0~40 mT. Here the coupling effect of denser ferro-concentration and stronger field imposed, responsible for the induction of ferro-surface tension, is found to be essential to determine the ferro-property.

並列關鍵字

O-Ring Method ； Ferro-Weight Increment