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Entropy 2014, 16(11), 5891-5900; doi:10.3390/e16115891

Heat Transfer Characteristics of a Speaker Using Nano-Sized Ferrofluid

1
Department of Mechanical Engineering, Dong-A University, Busan 604-714, Korea
2
Graduate school of Mechanical Engineering, Dong-A University, Busan 604-714, Korea
*
Author to whom correspondence should be addressed.
Received: 17 May 2014 / Revised: 17 October 2014 / Accepted: 6 November 2014 / Published: 10 November 2014
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Abstract

The purpose of this article is to study the heat transfer characteristics of a voice-coil and permanent magnet for a speaker using nano-sized ferrofluid. In order to investigate the temperature characteristics of the speaker, the speaker power ratings, ambient temperatures of the test chamber, chamber sizes and input signals were tested. As a result, the temperatures of the voice-coil and magnet for the speaker increased with time due to the thermal linearity. The temperature of the voice-coil increased with the decrease of the input signals, but with the increase of the nominal power rating. The voice-coil temperature of Speaker 1 using ferrofluid of an amount of 650 μL at an elapsed time of 10,000 s was 24.5% lower than that of general Speaker 1. In addition, the proper size selection of the enclosure is an important design factor to ensure the sound quality and effective heat transfer of the speaker. View Full-Text
Keywords: ferrofluid; heat transfer; speaker; voice-coil ferrofluid; heat transfer; speaker; voice-coil
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Lee, M.-Y.; Kim, H.-J. Heat Transfer Characteristics of a Speaker Using Nano-Sized Ferrofluid. Entropy 2014, 16, 5891-5900.

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