Effect of size and stretch of a moving ferrofluid drop on induced electromotive force

Ching Yao Chen, Sheng Yan Wang, Chih-yung Wen, Cheng Shiung Jan

Research output: Journal article publicationJournal articleAcademic researchpeer-review


Application for obtaining useful global features, e.g. the size and stretch of a moving ferrofluid drop by analyzing the characteristics of the induced electromotive force signal is demonstrated. These features are highly relevant to two maximum magnitudes in the electromotive force signal, e.g., the positive (V1) and the negative (V2) peak respectively induced when the drop enters and leaves the region covered by the induction coil. Favorable induction conditions of these two maximum magnitudes are opposite. In general, V1increases with the size of the ferrofluid drop because of stronger magnetization. On the contrary, V2is more prominent for a smaller drop, whose stretch is less significant. As a result, the ratio of |V1= V2| monotonically increases with the size of the ferrofluid drop. This finding suggests that the induced EMF signal can be used as a useful tool for quantifying the flow conditions, such as the size and stretch of moving ferrofluids.
Original languageEnglish
Pages (from-to)369-377
Number of pages9
Issue number3
Publication statusPublished - 1 Jan 2016

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Electrical and Electronic Engineering

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