Flow study in magnetic micro-channel heat pipe

Bang Ji Wang*, Chia Ray Chen, Jih Run Tsai, Wen Fang Lee, Chen Hua Chen, Ching-Yao Chen

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Last year we presented the two-phase flow simulations in heat pipe and demonstrated the test facility with experimental data. Since the magnetic field can provide an alternative driving force to help the condensed liquid traveling to the evaporating side of heat pipe, we can take advantage of this to enhance the performance of heat pipe. In order to enhance the performance of our next generation magnetic ferro-fluid heat pipe and further investigate the fluid motion in micro channels, experiments of a magnetic drop through a narrow passage are carried under various control parameters. The magnetic ferro-fluids we used are commercial light mineral oil-based ferro-fluids (EMG905) produced by Ferrotec Corp. The experiments have shown the process of a ferro-fluid drop passing through narrow passages with different sizes (diameters =0.3mm, 0.5 mm and 0.8mm) under various applied magnetic field strengths. The common characteristics are recorded in details, such as drop deformation, necking down, pinch-off, separation, and the formation of a satellite drop. Although the capillary driving force drops as the size of micro-channel increases, it is easier and faster for magnetic fluid to pass through larger size of micro-channel. Therefore, an optimized size or maybe several mixed-size micro-channels of magnetic heat pipe should be adopted for better performance. In addition, initial location of the magnetic field source (a coil of electromagnet) is also an important factor to be considered when a magnetic microchannel heat pipe is designed. Last but not least, applying magnetic field to enhance the performance of heat pipe is now possible and practical. The magnetic flow motion is interesting and should be further studied with various thermal conditions. More theoretical analysis and simulations of the new idea is currently under development and some preliminary results with experimental data will be presented in this conference paper.

Original languageEnglish
Title of host publication6th International Energy Conversion Engineering Conference, IECEC
PublisherAmerican Institute of Aeronautics and Astronautics Inc.
ISBN (Print)9781563479441
StatePublished - Jul 2008

Publication series

Name6th International Energy Conversion Engineering Conference, IECEC


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