Energy harvesting via fluidic agitation of a magnet within an oscillating heat pipe
| Autor: | Omar T. Ibrahim, Scott M. Thompson, J. Gabriel Monroe, Nima Shamsaei |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Energy Engineering and Power Technology Mechanical engineering Solenoid 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Industrial and Manufacturing Engineering 010305 fluids & plasmas Heat pipe Neodymium magnet Thermal conductivity Magnet 0103 physical sciences Heat exchanger Heat transfer Composite material 0210 nano-technology Condenser (heat transfer) |
| Zdroj: | Applied Thermal Engineering. 129:884-892 |
| ISSN: | 1359-4311 |
| DOI: | 10.1016/j.applthermaleng.2017.10.076 |
| Popis: | An ‘oscillating magnet’ energy harvesting module was developed and integrated into a 4-turn, tubular oscillating heat pipe (OHP) filled with water. The harvesting module consisted of a 1000-turn solenoid wrapped around a polycarbonate tube and two transverse posts, which were placed through the tube above and below the solenoid. Electromagnetic induction was accomplished via the thermally-driven, fluidic agitation of a suspended neodymium magnet placed between the transverse posts. The thermal performance and energy harvesting ability of this ‘oscillating-magnet OHP’ (OMHP) was experimentally investigated over a range of heat inputs with either 1.59 mm or 3.17 mm diameter neodymium magnets. Results demonstrate that the OMHP heat transfer performance decreased as the magnet diameter approached that of the OHP tube due to increased local pressure drops across the magnet, which disrupted advection between the evaporator and condenser. At 400 W of heat input, the OMHP equipped with a smaller oscillating magnet ( i.e. 1.59 mm diameter) produced a maximum peak electrical power of 21.9 µW and provided an effective thermal conductivity of ∼7000 W/m K. In contrast, the OMHP equipped with a larger oscillating magnet ( i.e. 3.17 mm diameter) produced a maximum peak electrical power of 428 µW and an effective thermal conductivity of ∼2600 W/m K at 200 W of heat input. Since the confined magnet motion is coupled with the heat transfer and internal fluid motion of the OHP, the design of the OMHP is driven by the importance of energy harvesting relative to thermal performance. This technology is unique in that it can be used for thermal management and in situ electric power production. |
| Databáze: | OpenAIRE |
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