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Three-Dimensional Theoretical Study on Flow Characteristics of a Spiral-Channel Viscous Micropump
Donghyuk Kang,Koichi Nishibe,Kotaro Sato,Kazuhiko Yokota 한국유체기계학회 2019 International journal of fluid machinery and syste Vol.12 No.2
Technological developments have led to micropumps playing an ever-greater role at the heart of micro total analysis systems. Spiral-channel viscous micropumps have been studied theoretically, numerically, and experimentally. However, high-accuracy performance predictions have not been achieved over a wide range of operating conditions. The present study proposes three-dimensional and quasi-three-dimensional theoretical expressions for predicting the pressure performance of spiral-channel viscous micropumps in low-Reynolds-number environments. The theoretical analysis is validated through a series of comparisons with numerical simulation results for the pressure performance curves, velocity distributions, velocity gradient distributions, and channel internal pressure distributions. Furthermore, the influence of the channel aspect ratio on the performance characteristics is investigated.
Behavior of Plane Synthetic Jets Generated by an Asymmetric Stepped Slot
Ryota Kobayashi,Hiroaki Terakado,Kotaro Sato,Junya Taniguchi,Koichi Nishibe,Kazuhiko Yokota 한국유체기계학회 2020 International journal of fluid machinery and syste Vol.13 No.1
This paper presents a fundamental study of jet directional control, i.e., thrust vectoring, using a synthetic jet generated by an asymmetric stepped slot. We present and discuss the results for a synthetic jet generated by a one-sided asymmetric stepped slot and focus on the relationship between the traveling direction of the formed jet and the offset ratio of the stepped slot and/or dimensionless frequency of the synthetic jet, within a jet deflection angle range of 0–90°. We demonstrate that there is an optimum offset ratio for jet deflection under the same dimensionless frequency because the traveling direction of the synthetic jet is dependent on the offset ratio of the stepped slot and the dimensionless stroke length (dimensionless frequency).
Proposal of Design Method for Viscous Micropumps with a Rotating-Disk Using Theory and Simulation
Wakana Tsuru,Donghyuk Kang,Kotaro Sato,Kazuhiko Yokota 한국유체기계학회 2022 International journal of fluid machinery and syste Vol.15 No.1
The aim of the present study is to treat circular- and spiral-shaped viscous micropumps unitarily and provide guidelines for determining the appropriate micropump for performance requirements. Three-dimensional theoretical equations applicable to circular- and spiral-shaped micropumps were derived. Numerical simulations were also performed, and the results were compared with the theoretical results. The results were qualitatively consistent. By comparing the performances of the two micropumps, the spiral- and the circular-shaped micropumps are suitable in the ratio of outermost diameter to channel width c* < 0.2, and c* > 0.2, respectively. The theoretical performance for rotating disk-type micropumps was expressed in a unified manner. Furthermore, the design guideline was provided based on the theoretical method.
Two-Dimensional Theoretical Study on Flow Characteristics of a Spiral-Channel Viscous Micropump
Donghyuk Kang,Koichi Nishibe,Kotaro Sato,Kazuhiko Yokota 한국유체기계학회 2018 International journal of fluid machinery and syste Vol.11 No.4
This study investigates the flow characteristics of a spiral-channel viscous micropump using two-dimensional theoretical analysis. The obtained results are compared to the results obtained from experiments, numerical simulations, and the theoretical analysis of Kilani et al., and the similarities and differences between these approaches are discussed. The present two-dimensional theoretical approach is validated. Its accuracy is improved as compared to previous work by setting the spiral-channel axis as the spiral-channel length from the pump inlet to the outlet and by considering the moving wall as a component in the spiral-channel direction of the circumferential velocity of the rotating disk. Furthermore, the present two-dimensional analysis can accurately predict pump performance, even though the actual flow in the micropump is three dimensional.
Miho Ota,Junko Matsuo,Noriko Sato,Toshiya Teraishi,Hiroaki Hori,Kotaro Hattori,Yoko Kamio,Norihide Maikusa,Hiroshi Matsuda,Hiroshi Kunugi 대한신경정신의학회 2018 PSYCHIATRY INVESTIGATION Vol.15 No.11
Objective Autistic spectrum traits are postulated to lie on a continuum that extends between individuals with autism and individuals with typical development. The present study was carried out to investigate functional and network abnormalities associated with autistic spectrum trait in healthy male subjects. Methods Subjects were 41 healthy male subjects who underwent the social responsiveness scale-adult (SRS-A) and magnetic resonance imaging. Results There was significant positive correlation between the total score of SRS-A and the regional cerebral blood flow (CBF) in posterior cingulate cortex (PCC). Also, there were changes in functional network such as in cingulate corti, insula and fusiform cortex. Further, we also found the significant difference of functional networks between the healthy male subjects with high or low autistic spectrum trait, and these points were congruent with the previous perceptions derived from autistic-spectrum disorders. Conclusion These findings suggest a biological basis for the autistic spectrum trait and may be useful for the imaging marker of autism symptomatology.
Miho Ota,Junko Matsuo,Noriko Sato,Toshiya Teraishi,Hiroaki Hori,Kotaro Hattori,Yoko Kamio,Norihide Maikusa,Hiroshi Matsuda,Hiroshi Kunugi 대한신경정신의학회 2018 PSYCHIATRY INVESTIGATION Vol.15 No.10
Objective: Autistic spectrum traits are postulated to lie on a continuum that extends between individuals with autism and individuals with typical development. The present study was carried out to investigate functional and network abnormalities associated with autistic spectrum trait in healthy male subjects. Methods: Subjects were 41 healthy male subjects who underwent the social responsiveness scale-adult (SRS-A) and magnetic resonance imaging. Results: There was significant positive correlation between the total score of SRS-A and the regional cerebral blood flow (CBF) in posterior cingulate cortex (PCC). Also, there were changes in functional network such as in cingulate corti, insula and fusiform cortex. Further, we also found the significant difference of functional networks between the healthy male subjects with high or low autistic spectrum trait, and these points were congruent with the previous perceptions derived from autistic-spectrum disorders. Conclusion: These findings suggest a biological basis for the autistic spectrum trait and may be useful for the imaging marker of autism symptomatology.