Effects of dimensional size and surface roughness on service performance for a micro Laval nozzle

Cai, Yukui; Liu, Zhanqiang; Shi, Zhenyu

doi:10.1088/1361-6439/aa6552

Cited by 12 publications

(10 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…When the exit diameter increases from 2.7 to 3.6 mm, the mean velocity clearly decreases, and a better droplet velocity characteristic is achieved at a smaller value of 2.7 mm. This finding is in accordance with similar studies [37,38], which indicates that the decrease in the exit diameter can significantly enhance the velocity performance.…”

Section: Influence Of the Exit Diametersupporting

confidence: 93%

“…In addition, as the exit diameter increases, the droplet turbulence decreases remarkably due to the decrease in the exit velocity of the gas-liquid phases. Otherwise, the decrease in the exit velocity can also reduce the impact of the gas-liquid phases on the SVC [37,39], which results in a reduction in the vibration frequency, thereby weakening the droplet turbulence caused by the SVC.…”

Section: Influence Of the Exit Diametermentioning

confidence: 99%

See 1 more Smart Citation

Influence of atomizing core on droplet dynamic behavior and machining characteristics under synergistically enhanced twin-fluid spray

Chen

Gao

et al. 2020

Int J Adv Manuf Technol

View full text Add to dashboard Cite

The droplet dynamic behavior of spraying during the manufacturing process affects tool life, cooling, and lubrication. A detailed understanding of droplet dynamic behavior is required to improve the surface quality while reducing the cutting fluid consumption. In this study, quantitative measurements for droplet diameter, number concentration, and axial velocity were carried out through a phase Doppler particle analyzer technique. The droplet characteristic spatial distributions of a standard twin-fluid nozzle (STN) and a novel twin-fluid nozzle (NTN) under different gas-to-liquid mass ratio (GLR) values were analyzed in detail. The results showed that the high-speed internal gas flow of an atomizing core has a significant effect on improving the synergistically enhanced atomization behavior, and more smaller droplets and an increased droplet momentum are easily obtained. Furthermore, a better spatial distribution of atomization characteristics can be achieved under a higher GLR of 4.3%. Furthermore, the effects of the novel atomizing core structural parameters on the droplet mean velocity spatial distribution, droplet turbulence, and root mean square velocity fluctuation were investigated. The results also showed that the improved NTN can effectively improve the spray atomization performance and droplet dynamic characteristics. In addition, comparative studies of the effect of the atomizing core structure on the machining performance were performed. Compared with the STN, the improved NTN achieves a significant reduction in cutting temperature, tool wear, and surface roughness of 17.25%, 33.96%, and 37.83%, respectively, owing to the better droplet dynamic characteristics and spatial distribution of spray atomization characteristics.

show abstract

Section: Influence Of the Exit Diametersupporting

confidence: 93%

Section: Influence Of the Exit Diametermentioning

confidence: 99%

Influence of atomizing core on droplet dynamic behavior and machining characteristics under synergistically enhanced twin-fluid spray

Chen

Gao

et al. 2020

Int J Adv Manuf Technol

View full text Add to dashboard Cite

show abstract

“…The surface roughness is also characterized in order to evaluate the results of the last step of the etching process (isotropic etching). The effect of the surface roughness is an important parameter that affects the performance of microthrusters and has been reported elsewhere[19,20].…”

mentioning

confidence: 95%

Vaporizing Liquid Microthrusters with integrated heaters and temperature measurement

Silva

Guerrieri

Zeijl

et al. 2017

Sensors and Actuators A: Physical

View full text Add to dashboard Cite

This paper presents the results of design, manufacturing and characterization of Vaporizing Liquid Microthrusters (VLM) with integrated heaters and temperature sensing. The thrusters use water as the propellant and are designed for use in CubeSats and PocketQubes. The devices are manufactured using silicon based MEMS (Micro Electro Mechanical Systems) technology and include resistive heaters to vaporize the propellant. The measurements of the heaters' resistances are used to estimate the temperature in the vaporizing chamber. The manufacturing process is described as well as the characterization of the thrusters' structural and electrical elements. In total 12 devices with different combinations of heaters and nozzles have been assessed and four of them have been used to demonstrate the successful operation of the thrusters. Results show a performance close to the design parameters and are used to validate the thrusters.

show abstract

“…MEMS nozzles are often fabricated as multilayer stacks [24,25,30,32]. As the size scale is reduced, viscous interactions with the walls become increasingly important [31,33].…”

Section: Previous Work On Mems Nozzles and Micro-jets And Miniature Smentioning

confidence: 99%

Supersonic jet interactions with a micro-engineered skimmer

Wright¹,

Syms²

2018

J. Micromech. Microeng.

View full text Add to dashboard Cite

A micro-engineered, skimmer-based vacuum interface has been demonstrated and used to investigate gas dynamics on a sub-millimeter length scale. The interface is fabricated as a stacked assembly of silicon dies, based on an anisotropically etched inlet orifice and a pyramidal skimmer cone formed in electroplated nickel. Expansion of gas into vacuum, interaction of a supersonic jet with the skimmer and transmission of a collimated beam into a second vacuum stage have all been imaged with a schlieren microscope. Using a glasswalled vacuum chamber, flow patterns upstream and fully downstream of the skimmer have been imaged together for the first time. At low first-stage pressures, the 150-200 µm tall skimmers cannot fully penetrate the shock arising from interaction of the jet with the back wall. However, as the pressure is increased, a multiple shock cell structure evolves, the jet narrows and transmission rises sharply. Eventually, a collimated beam is transmitted to the second stage. When the skimmer aperture is smaller than the source aperture, a series of distinct peaks is evident in a plot of transmission against first-stage pressure. Imaging shows that at each successive peak, the number of shock cells increases by one and the skimmer inlet is coincident with a node.

show abstract

Effects of dimensional size and surface roughness on service performance for a micro Laval nozzle

Cited by 12 publications

References 19 publications

Influence of atomizing core on droplet dynamic behavior and machining characteristics under synergistically enhanced twin-fluid spray

Influence of atomizing core on droplet dynamic behavior and machining characteristics under synergistically enhanced twin-fluid spray

Vaporizing Liquid Microthrusters with integrated heaters and temperature measurement

Supersonic jet interactions with a micro-engineered skimmer

Contact Info

Product

Resources

About