Numerical Analysis on the Internal Flow Field and Adsorption Performance of a Non-Contact Vortex Gripper

Zheng, Zhi; Liang, Dong; Lu, Bo; Huang, Jun Hui

doi:10.4028/www.scientific.net/amm.433-435.1959

Cited by 4 publications

(6 citation statements)

References 1 publication

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“…After the turning point (the c-d segment of F-h curve), the changing trends of F and h are contradictory, that is, h increases and F decreases because the air flows back into the vortex chamber to disturb the rotating flow. 10 This is why the next half of the F-h curve has a negative slope. The F-h curve is convex, and thus, the suction force has a maximum value (denoted as F max ).…”

Section: Maximum Forcementioning

confidence: 99%

“…Furthermore, the experimental and numerical simulation results by Li et al reveal that F max occurs when the peripheral pressure of the vortex chamber is equal to or less than the atmospheric pressure. 1,10 As a suction device, the suction capacity is the most important indicator of the vortex gripper, and it depends on F max . The vortex gripper is able to pick up any workpiece of weight less than F max .…”

Section: Maximum Forcementioning

confidence: 99%

“…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%

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

Wang

Zhao

2019

Advances in Mechanical Engineering

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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.

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Section: Maximum Forcementioning

confidence: 99%

Section: Maximum Forcementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Wang

Zhao

2019

Advances in Mechanical Engineering

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“…The CFD results confirmed that the above changes to the internal structure of the vortex chamber can enhance the suction force to some extent. Zheng et al 18 used CFD to observe the superiority of the dual nozzle structure relative to the single nozzle structure. 18 The above findings provide guidance for the design and use of the vortex gripper.…”

Section: Introductionmentioning

confidence: 99%

“…Zheng et al 18 used CFD to observe the superiority of the dual nozzle structure relative to the single nozzle structure. 18 The above findings provide guidance for the design and use of the vortex gripper.…”

Section: Introductionmentioning

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:

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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.

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Experimental study on radial suction flow and its effect in water vortex unit

Lyu,

Dai,

Shi

et al. 2024

Physics of Fluids

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A water vortex unit is a non-contact adsorption unit that utilizes water as a flowing medium. Negative pressure is generated on the adsorbed surface through the high-velocity rotation of the fluid, resulting in suction force. In comparison to the air vortex unit, the water vortex unit exhibits a substantial increase in suction force and has the capability to deliver greater power. However, the presence of the central bubble in the water vortex unit weakens the suction force. To address the impact of the central bubble, a suction hole was introduced on the vortex unit to remove them. Experimental results indicate that solely removing the central bubble has almost no effect on the radial pressure gradients in the gap flow path and chamber center of the water vortex unit. However, in the cylindrical neighborhood, the radial pressure gradient increases, leading to a certain degree of improvement in suction force. Further increasing the suction flow rate induces inward radial flow within the vortex chamber. This flow field further enhances the suction force. To analyze the reasons for this pressure distribution, we indirectly obtained the radial velocity distribution by examining the relationship between the pressure gradient and tangential velocity. The results of the tangential velocity distribution indicate that the radially inward suction flow significantly increases the rotational velocity of the fluid in the chamber center, enhancing the centrifugal inertial effect. This further reduces the negative pressure, resulting in a significant improvement in the suction of the vortex unit.

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Numerical Analysis on the Internal Flow Field and Adsorption Performance of a Non-Contact Vortex Gripper

Cited by 4 publications

References 1 publication

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

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

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

Experimental study on radial suction flow and its effect in water vortex unit

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