Design optimization of a viscous micropump with two rotating cylinders for maximizing efficiency

Choi, Hae-Jin; Lee, Yongbin; Choi, Donghoon; Maeng, Joo-Sung

doi:10.1007/s00158-009-0373-5

Cited by 19 publications

(6 citation statements)

References 18 publications

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“…Most CFD numerical procedures suffer from numerical noise in the analysis results with varying the values of the design variables. Approximate optimization based on response surface models is known to be more effective than optimization using mathematical programming methods for the optimization of noisy functions [15]. For the optimal design of the hydrodynamic coupling cross section, hydraulic diameter ratio of blades, central core position, and the meridional profile of the hub are selected as design variables.…”

Section: Methods Of Optimal Designmentioning

confidence: 99%

Design optimization of hydrodynamic coupling applying response surface method combined with CFD technique

Nejadali

2020

J Braz. Soc. Mech. Sci. Eng.

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Hydrodynamic coupling is a type of fluid machinery that uses fluid kinetic energy to transmit power. In this paper, meridional profile optimization of fully filled fluid coupling was performed to improve transmitted torque. The response surface method, a global optimization method, combined with CFD was introduced to find optimum meridional profile of blades. The torque coefficient was applied as an objective function. The response surface method was adopted with three design variables: hydraulic diameter ratio of blades, central core position, and meridional profile of the hub. Results showed that the best diameter ratio occurred at d/D =0.67. To specify an optimal position for the central core, a dimensionless parameter (b/d) was introduced. With regression analysis, it was found that the optimal point occurs at about b/d =0.37. It was confirmed with the results of contour and vector plots. Three types of curves (circular, elliptical, and cubic Bezier curve) were employed to optimize the meridional shape of blades. The circular curve was applied in the design of the hub in the reference geometry. Relative to the circular curve hub, the use of elliptic curve had no significant effect on the objective function. Two dimensionless parameters, l 1 /d and l 2 /d, were defined to investigate the effect of Bezier curves on the performance of hydrodynamic coupling. The optimum values for design variables of l 1 /d and l 2 /d were obtained 0.80 and 0.88, respectively.

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Section: Methods Of Optimal Designmentioning

confidence: 99%

Design optimization of hydrodynamic coupling applying response surface method combined with CFD technique

Nejadali

2020

J Braz. Soc. Mech. Sci. Eng.

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“…By comparing sets of channel dimensions and the rotor eccentricity, the optimum model was obtained to maximize the mass flow rate per unit of shaft power consumption. Choi et al [12] developed a dual rotating cylinders pump. By taking the advantage of the sequential metamodel-based optimization algorithm, the optimum design variables were automatically determined within the specific constraint; meanwhile, the relation between the objectives was revealed.…”

Section: Introductionmentioning

confidence: 99%

Multi-objective hydraulic optimization and analysis in a minipump

Bin¹,

Luo²,

Yuan³

et al. 2015

Science Bulletin

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“…The dynamics can be quite varied, and include hydrodynamic forces and velocities for spherical particles moving near planar walls (Goldman, Cox & Brenner 1967a,b), spheroidal particles in shear flows near a solid wall, as studied using a variant of the boundary integral equation method (Gavze & Shapiro 1997), and particle sedimentation near a plane wall accounting for weak non-Newtonian and inertial effects (Becker, McKinley & Stone 1996). Dynamics frequently involve cylindrical geometries, such as in the determination of the drag forces on a microcantilever oscillating near a wall (Clarke et al 2005), the design and optimization of viscous micropumps (Sen, Wajerski & Gad-el Hak 1996;Day & Stone 2000;Choi et al 2010), motion of air bearings, including effects of fluid compressibility (Witelski 1998), and the circular swimming motion of Escherichia coli bacteria near a solid boundary (Lauga et al 2006) and the motor torque of such bacteria (Das & Lauga 2018), among many others. In almost all, if not all, such cases, the cylinder is modelled as infinite.…”

Section: Introductionmentioning

confidence: 99%

Coupling of translation and rotation in the motion of finite-length rods near solid boundaries

2022

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The motion of finite-length cylindrical rods moving near a planar rigid surface is a scenario common across many engineering and natural settings. We study the low-Reynolds-number flow around finite rods that are allowed to rotate or translate in directions perpendicular or parallel to the plane. We develop a three-dimensional lubrication theory to characterize the pressure and hydrodynamic resistances of the cylinders through a special consideration of the cylinder's end effects. In addition, we use three-dimensional numerical simulations to solve these Stokes flows for cylinders of varying lengths and with varying gap sizes between the cylinder and plane, and the numerical results support the developed analytical descriptions. We also use visualizations of the flow to provide qualitative insights and rationalize the effect of the ends on the dynamics of the cylinders. The numerical simulations and theoretical predictions show good agreement in the long (isolated ends) and short (disk-like) limits.

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Design optimization of a viscous micropump with two rotating cylinders for maximizing efficiency

Cited by 19 publications

References 18 publications

Design optimization of hydrodynamic coupling applying response surface method combined with CFD technique

Design optimization of hydrodynamic coupling applying response surface method combined with CFD technique

Multi-objective hydraulic optimization and analysis in a minipump

Coupling of translation and rotation in the motion of finite-length rods near solid boundaries

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