A novel spray cooling device based on a dual synthetic jet actuator integrated with a piezoelectric atomizer

He, Wei; Luo, Zhenbing; Deng, Xiong; Xia, Zhang

doi:10.1007/s00231-019-02804-w

Cited by 14 publications

(3 citation statements)

References 26 publications

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“…Fortunately, the abovementioned aspects have drawn increasing attention. Scalable heat transfer-enhancing surfaces with high performance have been invented for pool boiling [150], condensation heat transfer [151], and solar steam generation [152], which inspire the design of spray cooling surfaces with similar merits. Piezo-electric spraying [17,71,153] and electrospraying [73,74] are proposed as two promising ways to achieve efficient and small-sized spray cooling.…”

Section: Conclusion and Future Concernsmentioning

confidence: 99%

Spray Cooling on Enhanced Surfaces: A Review of the Progress and Mechanisms

Wang

Jiang

2021

Journal of Electronic Packaging

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The rapid development of electronics, energy and propulsion systems has led us to the point where their performances are limited by cooling capacities. Heat fluxes of 10~100, even over 1,000 W/cm2 need to be dissipated with minimum coolant flow rate in next-generation power electronics. Spray cooling is a high heat flux, uniform and efficient cooling technique proven effective in various applications. However, its cooling capacity and efficiency need to be further improved to meet next-generation ultrahigh-power applications. Engineering of surface properties and structures can fundamentally affect the liquid-wall interactions, thus becoming the most promising way to enhance spray cooling. However, the unclear mechanisms of surface-enhanced spray cooling cause lack of guiding principles for surface design. Here, progress in spray cooling on surfaces with structures of different scales are reviewed and their performances evaluated and compared. Spray cooling can achieve critical heat flux (CHF) above 945 W/cm2 and heat transfer coefficient (HTC) up to 57 W/cm2K on structured surfaces for pressurized nozzle and CHF and HTC up to 1250 W/cm2 and 250 W/cm2K, respectively, on a smooth surface with the assistance of secondary gas flow. CHF enhancement of 110% was achieved on hybrid micro- and nanostructured surfaces. A clear map of enhancement mechanisms is proposed after analysis. Some future concerns are also proposed. This work helps the understanding and design of engineered surfaces in spray cooling and provides insights for interdisciplinary applications of heat transfer and advanced engineering materials.

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Section: Conclusion and Future Concernsmentioning

confidence: 99%

Spray Cooling on Enhanced Surfaces: A Review of the Progress and Mechanisms

Wang

Jiang

2021

Journal of Electronic Packaging

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“…These types of atomizers have their own advantages and disadvantages, but compared with static mesh atomizers, dynamic mesh atomizers do not need a liquid cavity with variable volume, greatly simplifying the structure and effectively solving the problems of the low energy utilization rate and large droplet size. In addition, given its advantages, such as low cost, low energy consumption, and uniform atomizing particle size, dynamic mesh atomizers have been widely used in air humidification, spray cooling, biomedicine, aromatherapy, atomizing inhalation therapy, and other fields [3][4][5][6][7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Error Correction and Reanalysis of the Vibration Analysis of a Piezoelectric Ultrasonic Atomizer to Control Atomization Rate

et al. 2023

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Dynamic mesh atomizers have been widely used in various fields because of their compact structure, low energy consumption, and low production costs. The finite element method is an important technique to analyze the factors affecting the atomization performance of dynamic mesh atomizers. However, at present, there is a lack of decisive solutions to the basic problems of boundary setting in terms of the simulation and vibration displacement characteristics of atomizers under different vibration modes. In this paper, two errors were found in the Vibration Analysis of a Piezoelectric Ultrasonic Atomizer to Control Atomization Rate paper written by Esteban Guerra-Bravo et al. in 2021. First, in the finite element analysis, the boundary condition of the atomizing sheet was set to be fixed, which is inconsistent with the actual support situation and seriously affects the vibration of the atomizing sheet. Second, in the simulation result, from the first mode to the third mode, the growth rate of the maximum displacement at the center of the atomizing sheet was as high as 77.12%, even up to 221.05%, which is inconsistent with the existing vibration theory. In view of these errors, in this paper, the working principle of dynamic mesh atomizers is analyzed and the vibration equation of the atomizing sheet under peripheral simple support is derived. Through comparison with the literature, it was proven that the boundary setting and vibration displacement of the atomizing sheet in the original paper are unreasonable. By measuring the atomizing rate of the atomizing sheet under different boundary conditions, it was proven that the peripheral freedom of the atomizing sheet should be greater than or equal to 1, namely, peripheral freedom or peripheral simply supported. The vibration displacement theory was used for the simulation, and the relationship between the vibration displacement and resonant frequency of the atomizing sheet under peripheral simple support was measured. It was found that with the increase in the resonance frequency, the maximum displacement of vibration modes with only nodal circles was larger than that of the other vibration modes, and the maximum displacement increased slightly with the increase in the number of nodal circles by about 0.98%.

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“…The piezoelectric atomizers that have emerged in recent years have the advantages of minimal noise, small atomizing quantities and small droplet size over traditional pneumatic atomizers; thus, they have been extensively applied in various fields such as ink-jet printing, spray cooling, biomedicine, spray machining, aromatherapy and odor reproduction [ 1 , 2 , 3 , 4 , 5 , 6 , 7 ]. Piezoelectric atomizers are divided into two structures, according to differences in the actuator: firstly, the liquid is atomized by high-frequency ultrasonic waves, as the actuator, generated due to the vibration of piezoelectric ceramics, and large droplets are filtered through small-holed metal meshes, thus completing atomization; this is referred to as a piezoelectric ultrasonic atomizer [ 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Research on the Machinability of Micro-Tapered Hole Group in Piezoelectric Atomizer and the Improvement Method

Zhang

Huang

Chen

et al. 2022

Sensors

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A metal atomizing sheet with a group of micro-tapered holes is the core constituent of a piezoelectric atomizer. However, the diameters of large-end and small-end micro-tapered holes in industrial applications deviate from the design values by 15.25% and 15.83%, respectively, which adversely impacts the effect of atomizers. In this study, two main factors that influence the machining quality of tapered holes, the external vibration disturbance and the internal system errors inside the laser processor, were explored; consequently, the vibration model of the machining device and the laser drilling model were established, respectively. Based on the models and the experimental results, it was found that the errors in diameter caused by these two factors accounted for 20% and 67.87% of the total deviation, respectively. Finally, an improved method was proposed, where a damping system was added to the machining device, and the diameter of the initial laser spot was corrected. The measurement results of tapered holes machined by the improved method showed that the deviation of the large diameters and the small diameters from the design values declined to 4.85% and 4.83%, respectively. This study lays a foundation for the high-precision and large-scale industry of atomizing sheets, and provides a new research direction for enhancing the performance of atomizers.

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A novel spray cooling device based on a dual synthetic jet actuator integrated with a piezoelectric atomizer

Cited by 14 publications

References 26 publications

Spray Cooling on Enhanced Surfaces: A Review of the Progress and Mechanisms

Spray Cooling on Enhanced Surfaces: A Review of the Progress and Mechanisms

Error Correction and Reanalysis of the Vibration Analysis of a Piezoelectric Ultrasonic Atomizer to Control Atomization Rate

Research on the Machinability of Micro-Tapered Hole Group in Piezoelectric Atomizer and the Improvement Method

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