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Open AccessLetter

Non-Contact Monitoring on the Flow Status inside a Pulsating Heat Pipe

by 1, 1,2,* and 1
1
School of Chemical Engineering, Kunming University of Science and Technology, Kunming 650500, China
2
Chongqing Key Laboratory of Micro-Nano System and Intelligent Sensing, Chongqing Technology and Business University, Chongqing 400067, China
*
Author to whom correspondence should be addressed.
Sensors 2020, 20(20), 5955; https://doi.org/10.3390/s20205955
Received: 20 September 2020 / Revised: 17 October 2020 / Accepted: 20 October 2020 / Published: 21 October 2020
(This article belongs to the Section Physical Sensors)
The paper presents a concept of thermal-to-electrical energy conversion by using the oscillatory motion of magnetic fluid slugs which has potential to be applied in the field of sensors. A pulsating heat pipe (PHP) is introduced to produce vapor-magnetic fluid plug–slug flow in a snake-shaped capillary tube. As the magnetic fluid is magnetized by the permanent magnet, the slugs of magnetic fluid passing through the copper coils make the magnetic flux vary and produce the electromotive force. The peak values of induced voltage observed in our tests are from 0.1 mV to 4.4 mV. The effects of the slug velocity, heat input and magnetic particle volume concentration on the electromotive force are discussed. Furthermore, a theoretical model considering the fluid velocity of the working fluid, the inner radius of the PHP and the contact angle between the working fluid and the pipe wall is established. At the same time, the theoretical and experimental results are compared, and the influences of tube inner radius, working fluid velocity and contact angle on the induced electromotive force are analyzed. View Full-Text
Keywords: pulsating heat pipe; electromagnetics; magnetic fluids; magnetism theory; sensors pulsating heat pipe; electromagnetics; magnetic fluids; magnetism theory; sensors
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MDPI and ACS Style

Chen, Y.; He, Y.; Zhu, X. Non-Contact Monitoring on the Flow Status inside a Pulsating Heat Pipe. Sensors 2020, 20, 5955.

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