A Study on Theoretical Flowrate of Gerotor Pump Using Chamber Areas

Lee, Min-Cheol; Kwak, Hyo Seo; Seong, Hansaem; Kim, Chul

doi:10.1007/s12541-018-0163-3

Cited by 9 publications

(9 citation statements)

References 15 publications

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“…Then,

v \propto ω

, and here the flow speed is quantified by calculating the speed of the tracer particles around the microrotor, after it rotates, since the fluid flow dominate the motion of the tracer particles and the random diffusion of the tracer particles can be ignored. The result shows a linear relationship between the flow speed and the rotational speed of the microrotor (inset of Figure 4c), which is consistent with the classical pump laws [44] . Hence the speed‐up of the rotation due to the light intensity or the fuel concentration will increase the flow rate, leading to the growth of the excluded area around the pump observed in Figure 4a.…”

Section: Figuresupporting

confidence: 83%

“…The increase of the light intensity or the fuel concentration leads to a faster rotational motion (Figure 3), which thus enhances the pumping effect represented by a larger saturated excluded area (Figure 4c). The pump laws state that the flow rate ( Q ) is proportional to the rotational speed (ω): [44]

Q \propto ω

. By definition, Q is the fluid volume (flow distance multiple by the thickness of fluid) pushed out by the rotor per unit time, which is directly proportional to the flow speed ( v ) when the thickness of the fluid layer is assumed constant.…”

Section: Figurementioning

confidence: 99%

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Synthesis of Snowman‐shaped Photocatalytic Microrotors and Mechanical Micropumps

Zhou

et al. 2021

ChemNanoMat

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We synthesize snowman‐shaped microrotors that are composed of TiO2 and SiO2 particles fused together and half‐coated with Au. The microrotors rotate in the presence of fuel and UV light and the rotation speed is readily modulated by the fuel concentration and the light intensity. Such a microrotor can be transformed into a mechanical micropump that hydrodynamically, rather than electrokinetically, pumps nearby fluids and particles, with a pump power that scales linearly with its rotation speed. This work thereby opens up a new way for the study of microrotors as micropumps.

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“…Then,

v \propto ω

Section: Figuresupporting

confidence: 83%

Q \propto ω

Section: Figurementioning

confidence: 99%

Synthesis of Snowman‐shaped Photocatalytic Microrotors and Mechanical Micropumps

Zhou

et al. 2021

ChemNanoMat

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“…Even though the benefits of elliptic arcs and asymmetric teeth are not sufficiently clear, they proved to help obtain flow rate capability, while keeping the wear rate and the flow irregularity at more acceptable levels (see Figure 11). The primary motivation of Kwak et al [57] and Lee et al [58] was to investigate the reduction of maximum contact stress and theoretical flow rate in various tooth profiles combinations (circle, ellipseinvolute and ellipse). Fluid-structural analysis by using commercial software allowed them to compare theoretical and numerical results with just a 9.3% rate of error.…”

Section: Energy Flow Friction and Stress Index Evaluationmentioning

confidence: 99%

A Review of Gerotor Technology in Hydraulic Machines

2019

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Over the years, numerous investigations have established the gerotor fundamentals. This work aims to provide a complete review of the literature from the last decade, focusing on the articles published in the past five years on gerotor technology in hydraulic machines. The report gives a catalogue of guidelines based on the trochoidal-envelope definition, a background analysis, the worldwide distribution of articles in each continent and country and the most frequently used keywords in the field. The paper identifies state-of-the-art research, and reports on current mainstream ideas. From the historical background, this literature review reports the current approaches in gerotor pumps (geometry and performance approaches, modeling and numerical simulations), orbital motors and new concepts. The report will serve as a guide and a directory for novel engineers working with gerotor technology in hydraulic machines. Another intention of this paper is to disseminate the works of the researchers who use this technology around the world, and to provide a scenario for future international collaboration. The paper gives an account of the disparity between academia and engineering applications. There is currently very little published literature on design and production methodologies for gerotor pumps and orbital motors. Hence, the future goal is to collect recommendations that combine academia and industry expertise to make better use of these extensive studies in the field.

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“…It is the difference between the two rolling velocities that are tangential to the tooth profiles and perpendicular to the line of action. Formulas to calculate specific sliding values of Flow rate (Q), which is the amount of working oil in the chambers is calculated by using Equation (22), where A max and A min are the largest and smallest values of the maximum chamber areas, and 'b', 'ρ fluid ' and 'ω 1 '' are the thickness of the gerotor, density of the working oil and rotational velocity of the inner rotor, respectively [15]. Irregularity (i) is proportional to the difference between the amount of fluid in the maximum chamber area (q max ) and that in minimum chamber area (q min ).…”

Section: Generation Of a Gerotor With 2-exlanded Cardioids Lobe Shapementioning

confidence: 99%

Design of Gerotor Oil Pump with 2-Expanded Cardioids Lobe Shape for Noise Reduction

et al. 2019

Self Cite

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Gerotor pump technology is being increasingly employed in innovative application fields, such as engines and as the hydraulic source of automatic transmissions. The most important issues in the automobile industry in recent years are improvement of fuel efficiency and noise reduction, so the existing studies relating to design of the gerotor profiles and the port in gerotor oil pumps have been conducted to ensure high flow rates and low irregularity. This study proposes a new gerotor lobe shape with 2-expanded cardioids to reduce the noise of the oil pump used in the automatic transmissions of automobiles. Theoretical equations to generate the tooth profile with 2-expanded cardioids was established, and then the gerotor profile to reduce noise was proposed using an automatic program. A design method for generation of a port shape suitable for the proposed gerotor was introduced, and performance tests (2000 rpm~3000 rpm) of the new oil pump with the suggested gerotor and port shape were implemented. The test results showed that the flow rate was improved by 7.3%~1.5% and the noise was reduced by 2.8 dB~4.8dB compared to those of the existing oil pump, so it was demonstrated that the design methods for the gerotor with 2-expanded cardioids and the port shape were validated. It is expected that the new lobe shape with 2-expanded cardioids and the port shape design method could be adopted in various fields, and will contribute to improving the performance of oil pumps.

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A Study on Theoretical Flowrate of Gerotor Pump Using Chamber Areas

Cited by 9 publications

References 15 publications

Synthesis of Snowman‐shaped Photocatalytic Microrotors and Mechanical Micropumps

Synthesis of Snowman‐shaped Photocatalytic Microrotors and Mechanical Micropumps

A Review of Gerotor Technology in Hydraulic Machines

Design of Gerotor Oil Pump with 2-Expanded Cardioids Lobe Shape for Noise Reduction

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