Experimental Investigation on Flow and Heat Transfer Characteristics of a Needle-Cylinder Type Ionic Wind Generator for LED Cooling
Abstract
:1. Introduction
2. Experimental Setup and Structure of LED Cooling Device
2.1. Structure of LED Cooling Device
2.2. Experimental Setup
3. Results and Discussion
3.1. The Current–Voltage Characteristics
3.2. Ionic Wind Velocity under Different Electrode Layouts
3.3. Temperature of the Heating Film under Ionic Wind Cooling
4. Conclusions
- The negative discharge is more difficult to break down when compared with the positive discharge. There is a breakdown in the positive discharge of three different numbers of needles, when the applied voltage approaches 24 kV. However, the breakdown does not occur in the negative discharge before the applied voltage reaches 24 kV.
- In the ionic wind devices with the same electrode layout, the ionic wind velocity produced by the negative polarity discharge is far greater than that produced by the positive polarity discharge. The ionic wind velocity at the measured point in the emitting electrode layout with three and with four needles is lower than that in the five needles electrode layout.
- The wind velocity decreases with the increase of the distance between the needles and the ring electrode in the three needles electrode layout at a certain applied voltage. On the other hand, in the case of four needles, the velocity of ionic wind decreases with the increase of the distance in the initial stage. However, a further increase of the electrodes distance will result in the increase in the ionic wind velocity.
- In the case of a five-needle electrode, the variation of velocity with the applied voltage is almost the same in the positive discharge when the voltage is larger than 16 kV, except when the electrodes distance is 6 mm, while the velocity variation in the negative discharge shows a slight difference with different electrode distances.
- The temperature of the heating film center in the three-needle electrode case is 3.8 °C higher than the temperature in the five-needle electrode case. The maximum temperature drop in the heating film center reaches 35.6 °C.
Author Contributions
Funding
Conflicts of Interest
Appendix A
Appendix A.1. Experimental Uncertainty Analysis
Appendix A.1.1. Velocity Measurement Error
Appendix A.1.2. Temperature Measurement Error
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Components | Specifications |
---|---|
Needle (diameter × length + material) | 1 mm × 11 mm + wolfram |
Ring (inner diameter × height × thickness+ material) | 98 mm × 16 mm × 2 mm + stainless steel |
Distances between the needles and the ring, L | 6 mm/11 mm/16 mm/21 mm/26 mm |
Working Parameters | Value |
---|---|
Voltage | 10.9 V |
Current | 0.92 A |
Size (diameter × thickness) | 30 mm × 0.15 mm |
Experimental Facilities | Properties |
---|---|
DC high voltage power supply (Teslaman TRC2020, Dalian Teslaman Technologies Co. Ltd., Dalian, China) | Output voltage range: 0~+50 kV, 0~−50 kV |
Resolution: 0.001 kV, 0.001 mA | |
Accuracy: ±0.1% | |
Stability: less than 0.1% per 8 h after boot up half an hour later | |
Agilent signal acquisition system (Agilent 34970A, Agilent Technologies Co. Ltd., Santa Clara, CA, USA) | Temperature measurement range: −100~400 °C 1 |
Accuracy: ±1 °C 1 | |
Resolution: 0.001 °C | |
T type thermal couples | Temperature measurement range: −100~400 °C |
Accuracy: ±0.5 °C | |
Steady voltage power supply (Maisheng MS-303D, Maihao Electronic Technology Co., Ltd., Dongguan, China) | Output voltage range:0–30 V |
Accuracy: ±1% ± 1 dgt 2 | |
Resolution: 0.01 V, 0.01 A | |
Hot-wire anemometer (Smart-Sensor AR866A, Sigma Technology Inc., Ltd. Hong Kong, China) | Measurement range: 0.1~30 m/s |
Accuracy: ±1% ± 1 dgt 2 | |
Resolution: 0.01 m/s |
Operation of the Heating Film | Temperature | |
---|---|---|
Heating Film Center, °C | Center of the Heat Sink Surface, °C | |
Without ionic wind | 88.6 | 65.2 |
Cooled by three-needle electrode | 56.8 | 34.2 |
Cooled by four-needle electrode | 55.3 | 31.5 |
Cooled by five-needle electrode | 53.0 | 30.5 |
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Qu, J.; Kong, L.; Zhang, J. Experimental Investigation on Flow and Heat Transfer Characteristics of a Needle-Cylinder Type Ionic Wind Generator for LED Cooling. Energies 2018, 11, 1149. https://doi.org/10.3390/en11051149
Qu J, Kong L, Zhang J. Experimental Investigation on Flow and Heat Transfer Characteristics of a Needle-Cylinder Type Ionic Wind Generator for LED Cooling. Energies. 2018; 11(5):1149. https://doi.org/10.3390/en11051149
Chicago/Turabian StyleQu, Jingguo, Lingjian Kong, and Jianfei Zhang. 2018. "Experimental Investigation on Flow and Heat Transfer Characteristics of a Needle-Cylinder Type Ionic Wind Generator for LED Cooling" Energies 11, no. 5: 1149. https://doi.org/10.3390/en11051149
APA StyleQu, J., Kong, L., & Zhang, J. (2018). Experimental Investigation on Flow and Heat Transfer Characteristics of a Needle-Cylinder Type Ionic Wind Generator for LED Cooling. Energies, 11(5), 1149. https://doi.org/10.3390/en11051149