Research Progress of Electrostatic Spray Technology over the Last Two Decades

Wang, Junfeng; Zhang, Yating; Zhang, Wei; Fan, Zifei

doi:10.1061/(asce)ey.1943-7897.0000763

Cited by 15 publications

(2 citation statements)

References 144 publications

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“…The electrostatic atomization process is shown in figure 17. The surface of the charged droplets generated by electrostatic atomization is unstable, and it is more likely to be subject to secondary atomization [226]. Ideally, the droplet shape is spherical under surface tension γ, and the droplet produces a pressure difference P 0 between the inner and outer surfaces.…”

Section: Atomization Mechanism and Performance Assessmentmentioning

confidence: 99%

Electrostatic atomization minimum quantity lubrication machining: from mechanism to application

Zhang

et al. 2022

Int. J. Extrem. Manuf.

164

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Metal cutting fluids in flood condition does not meet the urgent needs of emission cutting and carbon reduction, minimum quantity lubrication (MQL) is an effective alternative to flood lubrication. Nevertheless, the micro-droplets produced by pneumatic atomization MQL have poor infiltration and wetting properties, which cannot fully exert the film-forming and heat transfer performance of lubricant. The unique empowering mechanism of electrostatic atomization can not only solve the above technical bottleneck, but also realize parametric control of the droplets. Previously, the improvement of tool wear and surface integrity of electrostatic atomization have been preliminarily verified by experimental studies. However, the application principle of electrostatic atomization in the manufacturing process is ambiguous, which limits its further development and industrial application. Especially the in-depth understanding of the action mechanism of the high temperature and high pressure contact interface is difficult and meaningful. More importantly, electrostatic atomization-assisted MQL machining has not been systematically reviewed. In this review, firstly, an analysis of the critical devices, common media (nano-biolubricants) and empowering mechanisms is presented. Subsequently, the excellent machining performance of nano-biolubricants was quantitatively evaluated by comparing with flood, revealing its advanced lubrication and heat transfer mechanism. Furtherly, the excellent machining performance was assessed based on the enhanced penetration, infiltration and film formation properties of electrostatic atomization, with a 42.4% reduction in tool wear and a 47% improvement in machined surface Ra compared to pneumatic atomization. Finally, the limitations of current electrostatic atomization and green lubrication technologies are analyzed and the future trends (e.g. new processes and multi-process coupling) are foreseen. The aim of this paper is to provide a comprehensive review and critical assessment of the existing understanding, which can be used by scientists to gain insight into the mechanism of action, the theoretical basis, machining performance and development direction of new electrostatic atomization processes.

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Section: Atomization Mechanism and Performance Assessmentmentioning

confidence: 99%

Electrostatic atomization minimum quantity lubrication machining: from mechanism to application

Zhang

et al. 2022

Int. J. Extrem. Manuf.

164

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“…This process involves the transfer of charges, leading to the accumulation of charges of different polarities and densities on the surface of objects, resulting in electrostatic effects. Although static electricity plays a positive role in various fields such as electrostatic dust removal [6][7][8][9], electrostatic spraying [10][11][12][13], electrostatic flocking [14][15][16][17], and electrostatic copying [18,19], the accumulation discharge of charges and electrostatic attraction also pose significant hazards. For example, electrostatic discharge may cause electromagnetic interference and circuit breakdown in electronic devices [20,21], high-voltage electrostatic discharge poses a threat to personal safety [22], and electrostatic discharge in dusty environments may lead to explosions and fires [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Method for Measuring Surface Charge on Insulating Materials Based on the Vibrating Capacitor Method

Fan,

2024

Applied Sciences

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The phenomenon of surface charging, known as contact electrification or tribocharging, has wide-ranging applications but also notable hazards. Precisely measuring surface charge density in insulating materials is crucial for optimizing tribocharging and mitigating adverse effects. Although the vibrating capacitor method is commonly used for this purpose, its principle, designed for conductive materials, limits direct application to insulating surfaces, leaving the relationship between measured surface potential and surface charge density unclear. To address this issue, this study simulated the process of measuring the surface potential of insulating materials using Comsol simulations. It analyzed the effects of charged area size, probe height, and probe position, and utilized the spatial distribution of potential measurement values of surface point charges to derive an integral relationship between the distribution of measured surface potential values and the distribution of surface charge density. The integral relationship of surface potential distribution under different forms of surface charge density distributions calculated from this formula largely matches the numerical simulation results. Based on this, a relationship between the distribution of surface charge density and surface potential measurement values was further derived. This relationship can be used for measuring the surface charge density of insulating materials.

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Recent Progress of Droplet Microfluidic Emulsification Based Synthesis of Functional Microparticles

et al. 2023

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The remarkable control function over the functional material formation process enabled by droplet microfluidic emulsification approaches can lead to the efficient and one‐step encapsulation of active substances in microparticles, with the microparticle characteristics well regulated. In comparison to the conventional fabrication methods, droplet microfluidic technology can not only construct microparticles with various shapes, but also provide excellent templates, which enrich and expand the application fields of microparticles. For instance, intersection with disciplines in pharmacy, life sciences, and others, modifying the structure of microspheres and appending functional materials can be completed in the preparation of microparticles. The as‐prepared polymer particles have great potential in a wide range of applications for chemical analysis, heavy metal adsorption, and detection. This review systematically introduces the devices and basic principles of particle preparation using droplet microfluidic technology and discusses the research of functional microparticle formation with high monodispersity, involving a plethora of types including spherical, nonspherical, and Janus type, as well as core–shell, hole–shell, and controllable multicompartment particles. Moreover, this review paper also exhibits a critical analysis of the current status and existing challenges, and outlook of the future development in the emerging fields has been discussed.

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Research Progress of Electrostatic Spray Technology over the Last Two Decades

Cited by 15 publications

References 144 publications

Electrostatic atomization minimum quantity lubrication machining: from mechanism to application

Electrostatic atomization minimum quantity lubrication machining: from mechanism to application

Method for Measuring Surface Charge on Insulating Materials Based on the Vibrating Capacitor Method

Recent Progress of Droplet Microfluidic Emulsification Based Synthesis of Functional Microparticles

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