3D flow structures behind a wall-mounted short cylinder

2021 ◽  
Vol 221 ◽  
pp. 108535
Author(s):  
Hiroka Rinoshika ◽  
Akira Rinoshika ◽  
Jin-Jun Wang ◽  
Yan Zheng
Keyword(s):  
Flow Structures ◽  
3D Flow ◽  
Short Cylinder

scholarly journals Turbulent Kinetic Energy in Bolt Fishway

2019 ◽  
Vol 1 (2) ◽  
pp. 265-282
Author(s):  
Marta Puzdrowska ◽  
Tomasz Heese
Keyword(s):  
Spatial Distribution ◽  
Kinetic Energy ◽  
Turbulent Kinetic Energy ◽  
Laboratory Tests ◽  
Flow Structures ◽  
3D Flow ◽  
Velocity Magnitude ◽  
Biological Development ◽  
The Impact ◽  
Channel Development

The paper presents an analysis the spatial distribution of turbulent kinetic energy (TKE) for bolt fishways, including the impact of additional spillway slots and fixed channel development. The research was done for two models, each containing a different arrangement of slots. The presented results of research for bolt fishways were obtained as an effect of laboratory tests. The measurements were done for three components of instant flow velocity magnitude (speed). Analysis of the results was done for a 3D flow structure using Matlab software. In the case of bolt fishways, significant differences were noted for the method of velocity and TKE distribution, in reference to research comprising channels with biological development. It was stated that a reason for this is the flexible development of the channel. The occurrence of extreme TKE values in the chamber (pool) is strictly associated with the characteristics of interaction zones between various flow structures. It was also stated that the lower the parapet of the slot’s spillway shelf is in the fishway’s partition, the higher TKE could be expected just downstream of the section. These establishments may be important for the designing process in the case of fish passes of various types of construction.

scholarly journals 3D-Flow structures behind a circular cylinder with hemispherical head geometry

PAMM ◽  
2003 ◽  
Vol 3 (1) ◽  
pp. 40-43 ◽  
Author(s):  
A. Leder ◽  
U. Grebin ◽  
E. Hassel ◽  
Y. Kashkoul ◽  
A. Ackl
Keyword(s):  
Circular Cylinder ◽  
Flow Structures ◽  
3D Flow

Investigation of the 3D Flow in Hemodialysis Venous Air Traps

2014 ◽  
Vol 553 ◽  
pp. 156-161
Author(s):  
Gholamreza Keshavarzi ◽  
Tracie J. Barber ◽  
Guan Heng Yeoh ◽  
Anne Simmons
Keyword(s):  
Fluid Dynamic ◽  
Waste Product ◽  
The Body ◽  
Flow Structures ◽  
Air Bubbles ◽  
Health Issues ◽  
3D Flow ◽  
Air Bubble ◽  
Different Types ◽  
Flow Phenomena

Hemodialysis is an extracorporeal system which removes the waste product from kidneys for patients with kidney failure. Air bubbles within the system can cause several deficiencies to the system, and more importantly serious health issues to the patients. Therefore, different types of air traps (artery and venous side) are situated in the setup to prevent air bubbles passing through the system and being sent to the body. There have been evidence of the air trap deficiency. In order to understand these deficiencies the flow inside these air traps need to be understood. The investigation of the flow structures in air traps allow us to predict the efficiency of the air traps in capturing the air bubbles and preventing them from passing through. Computational fluid dynamic (CFD) has been used to compare the flow inside both these air traps. The results show interesting flow phenomena leading to explanations of the air bubble capturing effect.

scholarly journals Stereo MicroPIV measurements in an irrigation nozzle

2019 ◽  
Vol 85 ◽  
pp. 05005
Author(s):  
F. Gökhan Ergin ◽  
Séverine Tomas ◽  
Claudiu Pătraşcu
Keyword(s):  
Reynolds Number ◽  
Three Dimensional ◽  
Flow Structures ◽  
Rotating Flow ◽  
3D Flow ◽  
Micro Scale ◽  
Micro Channels ◽  
3D Flows ◽  
The Impact ◽  
Sharp Corners

Irrigation nozzles often feature small serpentine-shaped channels to avoid clogging. Reduced clogging improves the lifetime of the irrigation nozzle, which reduces plastic waste and thereby reduces the impact on the environment. Clogging in micro channels is often suppressed in the presence of three- dimensional (3D) flow structures called vortices. In micro scales the initiation of such 3D microstructures is normally suppressed because of the low Reynolds number inherent to micro scale flows. Passive, zig-zag shaped irrigation nozzles have the potential to induce three- dimensional rotating flow structures around sharp corners, which enhance 3D flows in the channel and thereby reduce clogging. The aim of this study is to identify and characterize such vortices using a Stereoscopic MicroPIV system.

scholarly journals THREE DIMENSIONAL FLOW STRUCTURES AROUND A DEEP SCOUR HOLE

2018 ◽  
Vol 40 ◽  
pp. 03015
Author(s):  
Akihiro Tominaga ◽  
Naohiko Sassa ◽  
Yuji Hara ◽  
Yuka Kuno
Keyword(s):  
Field Observation ◽  
River Discharge ◽  
Large Scale ◽  
Three Dimensional ◽  
Flow Structures ◽  
3D Flow ◽  
Three Dimensional Flow ◽  
Model Experiments ◽  
Dimensional Flow ◽  
Scour Hole

The existence of a planform vortex is considered to be the cause of development and sustention of large-scale local scouring in the Kiso River. In order to make clear the 3D flow structures in this deep local scour, we conducted a field observation and model experiments. From the result of ADCP set on the bottom of the scour hole, the velocity in the hole was increasing and the vertical vortex was developing, with an increase of river discharge. It is indicated that considerable magnitude of velocity was generated even near the bottom by the action of vertical vortex. This vortex was recognized in the model experiments. Consequently, the vertical vortex contributes to develop and maintain the large-scale local scouring.

Numerical Investigation of the Flow Field in a Turbine Cascade With Different Film Cooling Holes at the Leading Edge

2008 ◽  
Author(s):  
Xiaodong Wang ◽  
Shun Kang
Keyword(s):  
Film Cooling ◽  
Static Pressure ◽  
Leading Edge ◽  
Flow Structures ◽  
Turbine Cascade ◽  
3D Flow ◽  
Blade Passage ◽  
Pressure Surface ◽  
Cylindrical Holes ◽  
Film Cooling Holes

Flow structures in a turbine cascade with film cooling injections at the blade leading edge are investigated numerically for three cooling models of slots, straight cylindrical and spanwise inclined cylindrical holes under various blowing ratios, 0, 0.5, 0.7, 1.1, and 1.5. The numerical simulations are well compared with experiment results of static pressure and oil film visualization of blade surfaces. Discussions are mainly focused on the 3D flow structures within a blade passage. The results show that the 3D flow and energy loss production is greatly affected by the cooling injections, especially near the blade pressure surface.

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