ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Characteristics of heat transfer with single piezoelectric fan
Received date: 2016-11-24
Revised date: 2017-02-09
Online published: 2017-03-20
Supported by
National Natural Science Foundation of China (51106073);the Fundamental Research Funds for the Central Universities (NS2014018)
A numerical simulation of the three-dimensional unsteady flow and heat transfer characteristics of a single piezoelectric fan arranged normally to the heated surface is performed using dynamic meshing scheme. The displacement of the vibrating fan is determined from the vibration test by using the laser doppler vibrameter. An experimental test for the distribution of the local convective heat transfer coefficient is also made using the infrared camera. The distribution of the cycle-averaged local heat transfer coefficient obtained by the numerical simulation is found to be in good consistence with the test result. Due to the existence of the heated surface, the vortical structures excited by the piezoelectric fan behave somewhat differently from those observed in the free space. The shedding vortex is easier to be broken down in relation to the case in the free space. The near-wall flow field induced by the piezoelectric fan demonstrates obvious lateral flow parallel to the fan, and suction flow on both sides of the fan. The local convective heat transfer in the fan-tip vibration envelope is effectively enhanced. Dumbbell-shaped distribution of local convective heat transfer around the fan-tip vibration envelope is demonstrated.
LI Xinjun , ZHANG Jingzhou , TAN Xiaoming . Characteristics of heat transfer with single piezoelectric fan[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017 , 38(7) : 120982 -120982 . DOI: 10.7527/S1000-6893.2017.120982
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