Vortices within the Speparation in a Decelerating Square Channel Flow : Profiles of the Time-Averaged Velocity and Turbulence Level

2004 ◽  
Vol 2004 (0) ◽  
pp. 193
Author(s):  
Yoichi KINOUE ◽  
Toshiaki SETOGUCHI ◽  
Mohammad MAUMUN ◽  
Norimasa SHIOMI ◽  
Kenji KANEKO
Keyword(s):  
Channel Flow ◽  
Turbulence Level ◽  
Square Channel ◽  
Flow Profiles

Steady and Unsteady Characteristics of Two Corner Separations in a Decelerating Square Channel Flow

2006 ◽  
Author(s):  
Yoichi Kinoue ◽  
Toshiaki Setoguchi ◽  
Norimasa Shiomi ◽  
Kenji Kaneko
Keyword(s):  
Channel Flow ◽  
Cross Correlation ◽  
Static Pressure ◽  
Three Dimensional ◽  
Side Wall ◽  
Turbulence Level ◽  
Square Channel ◽  
Unsteady Characteristics ◽  
Decelerating Channel Flow ◽  
Peak Value

The three-dimensional separation in a decelerating channel flow generated by the suction through a porous side wall had been investigated experimentally. Unsteady characteristics of two corner separations were especially focused on. The profiles of time averaged static pressure are two-dimensional in the height direction even in the case with large regions of corner separation. The contour of the turbulence level of the mainstream velocity shows two peak values which correspond to two corner separations. The value of cross-correlation gets large negative values without any lag and the value of coherence gets peak value at around 0.5–2 Hz. The corner separations near the top wall and near the bottom wall are not independent and keep coherent structure both with negative value of cross correlation function and with the frequency of around 0.5–2 Hz.

scholarly journals A variational principle for magnetohydrodynamic channel flow

1970 ◽  
Vol 43 (1) ◽  
pp. 211-224 ◽  
Author(s):  
Norman C. Wenger
Keyword(s):  
Channel Flow ◽  
Variational Formulation ◽  
Fluid Velocity ◽  
Channel Cross Section ◽  
Mhd Generator ◽  
Square Channel ◽  
Flow Problems ◽  
Finite Electrical Conductivity ◽  
Magnetohydrodynamic Channel ◽  
Mhd Channel

A variational formulation is presented for a class of magnetohydrodynamic (MHD) channel flow problems. This formulation yields solutions for the fluid velocity and the induced electric potential in a channel with a uniform transverse static magnetic field. The channel cross-section is constant but arbitrary, and the channel walls can be either insulators or conductors with finite electrical conductivity. Electric currents are permitted to enter and leave the channel walls so that the solutions are suitable for MHD generator and pump applications. An example of a square channel with conducting walls is solved as an illustration.

Combined Influence of Synthetic Jet and Surface-Mounted Rib on Heat Transfer in a Square Channel

2015 ◽  
Vol 137 (12) ◽  
Author(s):  
Adnan Qayoum ◽  
P. K. Panigrahi
Keyword(s):  
Heat Transfer ◽  
Reynolds Number ◽  
Cross Section ◽  
Channel Flow ◽  
Actuation Voltage ◽  
Diameter Ratio ◽  
Synthetic Jet ◽  
Duct Flow ◽  
Synthetic Jet Actuator ◽  
Square Channel

This investigation reports the combined effect of synthetic jet and a surface-mounted rib on heat transfer in a square cross-section channel flow. The rib height to hydraulic diameter ratio is equal to 0.1625. The Reynolds number of the channel has been set equal to 5500. The synthetic jet actuator has been operated at different actuation voltages with different amplitude modulation frequencies. At actuation voltage of 55 V, the maximum overall heat transfer is enhanced by 132.6% compared with smooth duct flow.

D13 Corner Separation in a Decelerating Square Channel Flow

2008 ◽  
Vol 2008 (0) ◽  
pp. 153-154
Author(s):  
Yusuke TAKAHASHI ◽  
Yoichi KINOUE ◽  
Norimasa SHIOMI ◽  
Kenji KANEKO ◽  
Toshiaki SETOGUCHI
Keyword(s):  
Channel Flow ◽  
Corner Separation ◽  
Square Channel

scholarly journals Migration of finite sized particles in a laminar square channel flow from low to high Reynolds numbers

2014 ◽  
Vol 26 (12) ◽  
pp. 123301 ◽  
Author(s):  
M. Abbas ◽  
P. Magaud ◽  
Y. Gao ◽  
S. Geoffroy
Keyword(s):  
Channel Flow ◽  
Reynolds Numbers ◽  
Square Channel ◽  
High Reynolds Numbers ◽  
High Reynolds

Drag on Janus Sphere in a Channel: Effect of Particle Position

2020 ◽  
Author(s):  
Manish Dhiman ◽  
Raghvendra Gupta ◽  
Katha Anki Reddy
Keyword(s):  
Reynolds Number ◽  
Flow Field ◽  
Channel Flow ◽  
Hydrodynamic Force ◽  
Particle Reynolds Number ◽  
Particle Position ◽  
Square Channel ◽  
Channel Effect ◽  
Instantaneous Position ◽  
Potential Use

Abstract Potential use of Janus spheres in novel engineering applications is being explored actively in recent years. Hydrodynamics around Janus spheres is different from that around homogeneous sticky or slippery spheres. Instantaneous motion of a sphere in channel flow is governed by hydrodynamic force experienced by the sphere, which in turn depends on the particle to channel size ratio, its instantaneous position, hydrophobicity of its surface and the particle Reynolds number. We investigate numerically the drag experienced by a Janus sphere located at different off-centre positions in a square channel. Two orientations of Janus sphere consisting of a sticky and a slippery hemisphere with the boundary between them parallel to the channel mid-plane are studied: (1) slippery hemisphere facing the channel centreline and (2) sticky hemisphere facing the channel centreline. The flow field around Janus sphere is found to be steady (for Re ≤ 50 investigated in this work) and asymmetric. Based on the data obtained, a correlation for drag coefficient as a function of particle Reynolds number and dimensionless particle position is also proposed.

Vortices within the Separation in a Decelerating Square Channel Flow : Measurement of the Mainstream Velocity and Turbulence

2003 ◽  
Vol 2003 (0) ◽  
pp. 217
Author(s):  
Yoichi KINOUE ◽  
Toshiaki SETOGUCHI ◽  
Mamun MOHAMMAD ◽  
Norimasa SHIOMI ◽  
Kenji KANEKO ◽  
...  
Keyword(s):  
Channel Flow ◽  
Flow Measurement ◽  
Square Channel
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