Energy harvesting via thermo-piezoelectric transduction within a heated capillary
Energy harvesting via thermo-piezoelectric transduction within a heated capillary
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DOI：
10.1063/1.4996235
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发表时间：
2017-07-24
影响因子：
4
通讯作者：
Thompson, S. M.
中科院分区：
文献类型：
--
作者：
Monroe, J. G.;Bhandari, M.;Thompson, S. M.
通过使用压电换能器（PZT）集成在部分充满水的振荡热管（OHP）的一部分内，证明了热能到动能到电能的转换。密封的PZT换能器被配置为平行于OHP内的主导流动方向的弓形弹簧。OHP的底部以50 W的增量加热，而其顶部通过水块主动冷却。在类似于50 W时，由于OHP蒸发器中产生的不均匀蒸汽压，内部流体开始以类似于2- 4 Hz的频率振荡。观察到低频流体“脉冲”发生在弯曲的同轴压电换能器上，导致其偏转和可测量的电压尖峰在24 mV和63 mV之间。OHP，同时具有其内部流体焓收获，被发现仍然具有超高的热导率的顺序为10千瓦/米K;然而，其最大操作热负荷下降，由于由PZT材料引入的压降。通过OHP内的热驱动流体振荡而成为可能的热压电收集概念提供了一种用于组合的能量收集和热管理的被动方法，该方法是可扩展的和便携的。出版社：AIP Publishing
Thermal-to-kinetic-to-electrical energy conversion is demonstrated through the use of a piezoelectric transducer (PZT) integrated within a section of an oscillating heat pipe (OHP) partially filled with water. The sealed PZT transducer was configured as a bow spring parallel to the dominant flow direction within the OHP. The bottom portion of the OHP was heated in increments of 50W, while its top portion was actively cooled via water blocks. At similar to 50W, the internal fluid started to oscillate at similar to 2-4Hz due to the non-uniform vapor pressure generated in the OHP evaporator. Low-frequency fluid "pulses" were observed to occur across the flexed, in-line piezoelectric transducer, resulting in its deflection and measureable voltage spikes ranging between 24 and 63 mV. The OHP, while having its internal fluid enthalpy harvested, was found to still have an ultra-high thermal conductivity on-the-order of 10 kW/m K; however, its maximum operating heat load decreased due to the pressure drop introduced by the PZT material. The thermo-piezoelectric harvesting concept made possible via the thermally driven fluid oscillations within an OHP provides a passive method for combined energy harvesting and thermal management that is both scalable and portable. Published by AIP Publishing.