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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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The KSFM Journal of Fluid Machinery
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Journal DOI :
Korean Fluid Machinery Association
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Volume & Issues
Volume 13, Issue 6 - Dec 2010
Volume 13, Issue 5 - Oct 2010
Volume 13, Issue 4 - Aug 2010
Volume 13, Issue 3 - Jun 2010
Volume 13, Issue 2 - Apr 2010
Volume 13, Issue 1 - Feb 2010
Selecting the target year
Effects of Surface Roughness and Interface Wettability in a Nanochannel
Choo, Yun-Sik ; Seo, In-Soo ; Lee, Sang-Hwan ;
The KSFM Journal of Fluid Machinery, volume 13, issue 2, 2010, Pages 5~11
DOI : 10.5293/KFMA.2010.13.2.005
The nanofluidics is characterized by a large surface-to-volume ratio, so that the surface properties strongly affect the flow resistance. We present here the results showing that the effect of wetting properties and the surface roughness may considerably reduce the friction of fluid past the boundaries. For a simple fluid flowing over hydrophilic and hydrophobic surfaces, the influences of surface roughness are investigated by the nonequilibrium molecular dynamics (NEMD) simulations. The fluid slip at near a solid surface highly depends on the wall-fluid interaction. For hydrophobic surfaces, apparent fluid slips are observed on smooth and rough surfaces. The solid wall is modeled as a rough atomic sinusoidal wall. The effects on the boundary condition of the roughness characteristics are given by the period and amplitude of the sinusoidal wall. It was found that the slip velocity for wetting conditions at interface decreases with increasing effects of surface roughness. The results show the surface rougheness and wettability determines the slip or no-slip boundary conditions. The surface roughness geometry shows significant effects on the boundary conditions at the interface.
Computational Design of a Disk-Shape Boundary-Layer Pump
Jeong, S.Y. ; Chang, S.M. ; Yang, J.S. ;
The KSFM Journal of Fluid Machinery, volume 13, issue 2, 2010, Pages 12~17
DOI : 10.5293/KFMA.2010.13.2.012
A kind of disk-shape boundary layer pump is designed numerically by using a software of computational fluid dynamics, which is widely used for the special purposes such as artificial hearts, bio-fluidics and transportation of oceanic lives, etc. From the numerical simulation with an axisymmetric model, some benchmark problems are tested and compared with experimental results. The performance of disk pump is graphically visualized from the computational results, and converted to the dimensionless parameters. Finally, the obtained numerical data in the present investigation can be used for the baseline for new design to achieve a more efficient disk pump.
A Study on Aerodynamic and Noise Characteristics of a Sirocco Fan for Residential Ventilation
Kim, Jin-Hyuk ; Song, Woo-Seog ; Lee, Seung-Bae ; Kim, Kwang-Yong ;
The KSFM Journal of Fluid Machinery, volume 13, issue 2, 2010, Pages 18~23
DOI : 10.5293/KFMA.2010.13.2.018
This paper presents a procedure for the aerodynamic and aeroacoustic characteristics of a sirocco fan. For the aerodynamic and aeroacoustic analyses of the sirocco fan, three-dimensional steady and unsteady Reynolds-averaged Navier-Stokes equations are solved with a shear stress transport turbulence model for turbulence closure. The flow analyses were performed on a hexahedral grid using a finite-volume solver. The validation of the numerical results is performed by comparing with experimental data for the pressure, efficiency and power. The internal flow analyses of the sirocco fan are performed to understand the unstable flow phenomenon on the casing for the wall pressure and internal flow characteristics at each position. It was found that fluctuation of pressure and locally concentrated noise source are observed near the cut-off and expansion regions of the casing.
A Study on Performance Characteristics of an Axial Compressor with the Casing Groove
Choi, Kwang-Jin ; Kim, Jin-Hyuk ; Kim, Kwang-Yong ;
The KSFM Journal of Fluid Machinery, volume 13, issue 2, 2010, Pages 24~29
DOI : 10.5293/KFMA.2010.13.2.024
This paper presents a study on the performance of NASA Rotor 37 with the casing grooves based on three-dimensional numerical analysis. Reynolds-averaged Navier-Stokes equations are solved on a hexahedral grid with the shear stress transport model as a turbulence closure model. The governing equations are discretized by a finite volume method. The validation of the numerical results is performed through experimental data for the total pressure ratio and the adiabatic efficiency. The investigation for an axial compressor with a smooth casing and the casing grooves is carried out to compare the performance parameters, for example, surge margin and efficiency, etc. The surge margin is improved in the case of the casing grooves while remarkable improvement of the efficiency is not produced. The result shows that the casing groove is beneficial to expand the operating range of NASA Rotor 37.
Pressure Characteristics According to the Duct Shapes of Turbo Blowers Connected in Serial
Park, Young-Bin ; Jang, Choon-Man ; Yang, Sang-Ho ;
The KSFM Journal of Fluid Machinery, volume 13, issue 2, 2010, Pages 30~35
DOI : 10.5293/KFMA.2010.13.2.030
Pressure characteristics according to the duct shapes of turbo blowers connected in serial have been performed to reduce pressure loss in the piping system. To analyze three-dimensional flow field in the turbo blower system, general analysis code, CFX, is introduced in the present work. SST turbulence model is applied to estimate the eddy viscosity. Throughout the numerical simulation for the turbo blower system having a various shape of a inlet guide, optimal inlet guide can be selected. It is found that the pressure loss in the piping system having the optimal inlet guide can be reduced by minimizing the inflow distortion at the upstream of the impeller. Detailed flow analysis of the blower system serially connected is also performed and analyzed.
Interference Effects on the Performance of Multi-arrayed HAT TCP Devices
Jo, Chul-Hee ; Lee, Kang-Hee ; Yim, Jin-Young ; Rho, Yu-Ho ;
The KSFM Journal of Fluid Machinery, volume 13, issue 2, 2010, Pages 36~40
DOI : 10.5293/KFMA.2010.13.2.036
Tidal current power system is the energy converter which converts the kinetic energy of tidal stream into electric energy. The performance of the rotor which initially converts the energy is determined by various design factors and it should be optimized by the ocean environment of the field. Flow direction changes due to rise and fall of the tides, but horizontal axis turbine is very sensitive to direction of flow. To investigate the rotor performance considering the interaction problems with incidence angle of flow, series of experiments have been conducted. The results and findings are summarized in the paper.
Effects of Incidence on Aerodynamic Losses in the Tip-Leakage Flow Region of a High-Turning Turbine Rotor Blade
Chae, Byoung-Joo ; Lee, Sang-Woo ;
The KSFM Journal of Fluid Machinery, volume 13, issue 2, 2010, Pages 41~47
DOI : 10.5293/KFMA.2010.13.2.041
The effect of incidence angle on the three-dimensional flow and aerodynamic loss in the tip leakage flow region downstream of a turbine rotor cascade has been investigated for two tip gap-to-chord ratios of h/c=0.0% (no tip gap) and 2.0%. The incidence angle is changed to be
. The results show that for
, secondary flows including the passage vortex are intensified noticeably, and there is a strong interaction between the passage and tip leakage vortices. For
, however, the passage vortex is weakened significantly, so that there exists only a strong leakage-jet-like secondary flows near the casing wall. For h/c=0.0% and 2.0%, aerodynamic loss tends to increase with increasing i from
. A small increment of i in its positive incidence range results in a remarkable aerodynamic loss increase, while increasing i in the negative incidence range leads to a small change in the aerodynamic loss generation.
A Computerized Design System of the Axial Fan Considering Performance and Noise Characteristics
Lee, Chan ; Kil, Hyun-Gwon ;
The KSFM Journal of Fluid Machinery, volume 13, issue 2, 2010, Pages 48~53
DOI : 10.5293/KFMA.2010.13.2.048
A computerized design system of axial fan is developed for constructing 3-D blade geometry and predicting both aerodynamic performance and noise. The aerodynamic blading design of fan is conducted by blade angle distribution, camber line determination, airfoil thickness distribution and blade element stacking along spanwise distance. The internal flow and the aerodynamic performance of designed fan are predicted by the through-flow modeling technique with flow deviation and pressure loss correlations. Based on the predicted internal flow field and performance data, fan noise is predicted by two models for discrete frequency and broadband noise sources. The present predictions of the flow distribution, the performance and the noise level of actual fans are well agreed with measurement results.
The Study about Control Monitoring of Fiber Optic Sensor on Vacuum Pipeline for Waste Collecting System
Lee, Joon-Young ; Kim, Chae-Suk ; Kim, Bong-Gyu ;
The KSFM Journal of Fluid Machinery, volume 13, issue 2, 2010, Pages 54~58
DOI : 10.5293/KFMA.2010.13.2.054
The most recent, Vacuum Pipeline for Waste Collecting System, to collect MSW(Municipal Solid Waste) efficiently, is used environmental preservative, to emit less air pollution, in New City. However, it is difficult to monitor broken pipe and filled mass of Waste, because Vacuum Pipeline is laid underground. Therefore, FBG, optical fiber sensor, is used to inspect the temperature change and longitudinal strain to take proper action for unusual situation. I have need to accumlate sensor data of district control. I hope to be used Vacuum Pipeline more than 30 years in New City.
Design Method of the Sirocco Fan Considering Aeroacoustic Performance Characteristics
Lee, Chan ;
The KSFM Journal of Fluid Machinery, volume 13, issue 2, 2010, Pages 59~64
DOI : 10.5293/KFMA.2010.13.2.059
A design method of Sirocco fan is developed for constructing 3-D impeller and scroll geometries, and for predicting both the aerodynamic performance and the noise characteristics of the designed fan. The aerodynamic blading design of fan is conducted by blade angle, camber line determinations and airfoil thickness distribution, and then the scroll geometry of fan is designed by using logarithmic spiral. The aerodynamic performance of designed fan is predicted by the meanline analysis with flow blockage, slip and pressure loss correlations. Based on the predicted performance data, fan noise is predicted by two models for cutoff frequency and broadband noise sources. The present predictions for the performance and the noise level of actual fans are well agreed with measurement results.