Application and comparison of different turbulence models in the three-dimensional numerical simulation of non-contact swirl sucker

Wu, Qiong; Ye, Qian; Meng, GuoXiang

doi:10.1109/fpm.2011.6045746

Cited by 4 publications

(3 citation statements)

References 8 publications

(6 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because the airflow at the exit region was extremely complex which makes it difficult to define the boundary conditions accurately, a buffer region was added outside the original computational domain to better set the boundary conditions at the exit. 15,19 And the boundary of the buffer region was set as the pressure outlet (i.e., atmospheric pressure). When selecting a turbulence model, Wu et al considered that the simulation results of the renormalization group (RNG) k-e model and Reynolds stress transport model (RSTM) can well describe the flow state inside a vortex gripper.…”

Section: Methodsmentioning

confidence: 99%

“…When selecting a turbulence model, Wu et al considered that the simulation results of the renormalization group (RNG) k-e model and Reynolds stress transport model (RSTM) can well describe the flow state inside a vortex gripper. 19 In this study, the RNG k-e model was adopted to improve the simulation efficiency. Figure 5(b) shows the result after meshing.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Two-dimensional pressure field and backflow in the annular skirt of vortex gripper

Zhao

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

The vortex gripper is a kind of pneumatic noncontact gripper that does not produce a magnetic field and heat. It can grip a workpiece without physical contact, which avoids any unintentional damage such as mechanical scratches, local stress concentrations, frictional static electricity, and surface stains. This study focused on the two-dimensional pressure distribution field on a workpiece surface under the vortex gripper. Theoretical, experimental, and computational fluid dynamics results were combined to study the backflow phenomenon in the annular skirt, which can decrease the gripper’s suction force after the maximum value is reached. First, the pressure distribution in the annular skirt was theoretically modeled. A comparison with the experimental results showed that increasing the gap height between the gripper and workpiece generates a circumferentially asymmetrical flow field in the skirt. Based on this, it was hypothesized that an airflow in the circumferential direction may exist. The experimental data and simulation results were analyzed under large gap height conditions to observe the backflow in detail and it was found that an uneven pressure distribution with positive and negative pressure regions generated by the uneven flow is the root cause of the backflow. Finally, the effect of the backflow on the flow field in two different flow regions (in the annular skirt and inside the vortex chamber) was analyzed and the reason why the suction force of the vortex gripper has a maximum value was determined.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Two-dimensional pressure field and backflow in the annular skirt of vortex gripper

Zhao

2020

Proceedings of the Institution of Mechanical Engineers, Part C:

View full text Add to dashboard Cite

show abstract

“…Since then, many researchers have studied the flow phenomena inside the vortex gripper. [8][9][10] Iio and colleagues [11][12][13] used an underwater environment to simulate the gaseous environment and observed the swirling flow through visualization. Wu et al 6 used the particle image velocimetry method to obtain the experimental data of the rotational velocity distribution inside the vortex gripper.…”

Section: Introductionmentioning

confidence: 99%

Effect of chamber diameter of vortex gripper on maximum suction force and flow field

Wang

Zhao

2019

Advances in Mechanical Engineering

View full text Add to dashboard Cite

The vortex gripper is a non-contact suction device that uses a high-speed rotating airflow to create a negative pressure and suction force. In this research, we studied the effect of the vortex gripper’s diameter on the maximum suction force and internal flow field. First, we proposed a simplified theoretical model of the maximum suction force and predicted the influences of changing the diameter. Then, we obtained the maximum suction forces of the grippers with different diameters through the experiment. Both the theoretical and experimental results show that changing the diameter of the vortex gripper increases the maximum suction force. However, with the increase in the diameter, the prediction of the trend of the maximum suction force is inconsistent with the experimental results. To analyze the difference between the theoretical and experimental results, we further measured the pressure distribution of the vortex gripper and calculated the pressure gradient. The pressure distribution showed that the maximum negative pressure decreases while the diameter increases, and there is a pressure platform, which dominates the central area of the chamber. Next, we indirectly obtained the circumferential velocity distribution based on the relationship between the pressure gradient and circumferential velocity. The results of the circumferential velocity distribution reveal that the high-speed rotating airflow only exists in the area near the inner wall of the vortex chamber, while the circumferential velocity in the central part of the vortex chamber is extremely slow. In addition, the results clarify that the inaccurate assumption of velocity distribution of the simplified theoretical model is the main cause of the theoretical prediction bias.

show abstract

Experimental and numerical study of the adsorption performance of a vortex suction device using water-swirling flow

Zhu

Zhou

Yang

et al. 2020

Sci. China Technol. Sci.

View full text Add to dashboard Cite

Application and comparison of different turbulence models in the three-dimensional numerical simulation of non-contact swirl sucker

Cited by 4 publications

References 8 publications

Two-dimensional pressure field and backflow in the annular skirt of vortex gripper

Two-dimensional pressure field and backflow in the annular skirt of vortex gripper

Effect of chamber diameter of vortex gripper on maximum suction force and flow field

Experimental and numerical study of the adsorption performance of a vortex suction device using water-swirling flow

Contact Info

Product

Resources

About