Generation of swirl flow for non-contact rotation of micro objects by vibrating glass needle

2016 ◽  
Author(s):  
Xiaoming Liu ◽  
Masaru Kojima ◽  
Qing Shi ◽  
Yasushi Mae ◽  
Qiang Huang ◽  
...  
Keyword(s):  
Swirl Flow ◽  
Glass Needle

Boiling heat transfer in swirl flow of subcooled water

2002 ◽  
Author(s):  
Aleksey V. Dedov ◽  
Alexander T. Komov ◽  
Alexander N. Varava ◽  
Victor V. Yagov
Keyword(s):  
Heat Transfer ◽  
Boiling Heat Transfer ◽  
Swirl Flow ◽  
Subcooled Water

VISUALIZATION AND CHARACTERIZATION OF A LATERAL SWIRL FLOW STRUCTURE IN SINUSOIDAL CORRUGATED-PLATE CHANNELS

2010 ◽  
Vol 17 (4) ◽  
pp. 281-296 ◽  
Author(s):  
S. Vyas ◽  
Raj Manglik ◽  
Milind A. Jog
Keyword(s):  
Flow Structure ◽  
Swirl Flow

A swirl flow evaporative cold plate

1985 ◽  
Author(s):  
R. NIGGEMANN ◽  
W. GREENLEE ◽  
D. HILL ◽  
W. ELLIS ◽  
P. MARSHALL
Keyword(s):  
Swirl Flow ◽  
Cold Plate

Turbulent swirl flow analysis by Kolmogorov's similarity hypotheses

PAMM ◽  
2021 ◽  
Vol 20 (1) ◽  
Author(s):  
Ðorđe S. Čantrak ◽  
Novica Z. Janković ◽  
Miloš S. Nedeljković
Keyword(s):  
Flow Analysis ◽  
Swirl Flow

Numerical simulation of swirling flow effect on the first stage vane film cooling distribution

2016 ◽  
Vol 07 (03) ◽  
pp. 1650031
Author(s):  
Hong Yin
Keyword(s):  
Flow Field ◽  
Film Cooling ◽  
Swirling Flow ◽  
Cooling System ◽  
Leading Edge ◽  
Suction Side ◽  
Local Area ◽  
Swirl Flow ◽  
Flow Effect ◽  
Recirculation Flow

In advanced gas turbine technology, lean premixed combustion is an effective strategy to reduce peak temperature and thus, NO[Formula: see text] emissions. The swirler is adopted to establish recirculation flow zone, enhancing mixing and stabilizing the flame. Therefore, the swirling flow is dominant in the combustor flow field and has impact on the vane. This paper mainly investigates the swirling flow effect on the turbine first stage vane cooling system by conducting a group of numerical simulations. Firstly, the numerical methods of turbulence modeling using RANS and LES are compared. The computational model of one single swirl flow field is considered. Both the RANS and LES results give reasonable recirculation zone shape. When comparing the velocity distribution, the RANS results generally match the experimental data but fail to at some local area. The LES modeling gives better results and more detailed unsteady flow field. In the second step, the RANS modeling is incorporated to investigate the vane film cooling performance under the swirling inflow boundary condition. According to the numerical results, the leading edge film cooling is largely altered by the swirling flow, especially for the swirl core-leading edge aligned case. Compared to the pressure side, the suction side film cooling is more sensitive to the swirling flow. Locally, the film cooling jet is lifted and turned by the strong swirling flow.

Enhancement of heat transfer by turbulent decaying swirl flow

1999 ◽  
Vol 40 (13) ◽  
pp. 1365-1376 ◽  
Author(s):  
M Yilmaz ◽  
Ö Çomakli ◽  
S Yapici
Keyword(s):  
Heat Transfer ◽  
Swirl Flow ◽  
Enhancement Of Heat Transfer

Electrochemical study of mass transfer in decaying annular swirl flow Part II: Correlation of mass transfer data

1995 ◽  
Vol 25 (1) ◽  
Author(s):  
S. Yapici ◽  
M.A. Patrick ◽  
A.A. Wragg
Keyword(s):  
Mass Transfer ◽  
Swirl Flow ◽  
Electrochemical Study ◽  
Transfer Data ◽  
Flow Part

Fluid Force Moment on the Backshroud of a Francis Turbine Runner in Precession Motion

2010 ◽  
Vol 132 (5) ◽  
Author(s):  
Bingwei Song ◽  
Hironori Horiguchi ◽  
Yumeto Nishiyama ◽  
Shinichiro Hata ◽  
Zhenyue Ma ◽  
...  
Keyword(s):  
Flow Model ◽  
Swirl Flow ◽  
Francis Turbine ◽  
Leakage Flow ◽  
Fluid Force ◽  
Disk Rotation ◽  
Leakage Flow Rate ◽  
Turbine Runner ◽  
Force Moment ◽  
Axial Clearance

The fundamental characteristics of rotordynamic fluid force moment on the backshroud of a Francis turbine runner in precession motion were studied using model tests and computations based on a bulk flow model. The runner is modeled by a disk positioned close to a casing with a small axial clearance. An inward leakage flow is produced by an external pump in the model test. The effects of the leakage flow rate, the preswirl velocity at the inlet of the clearance, and the axial clearance on the fluid force moment were examined. It was found that the fluid force moment encourages the precession motion at small forward precession angular velocity ratios and the region encouraging the precession motion is affected by the preswirl velocity. Through the comparisons of the fluid force moment with and without the rotation of the disk, it was found that the normal moment without the disk rotation did not have the effect to encourage the precession motion. Thus, the swirl flow due to disk rotation was found to be responsible for the encouragement of the precession motion.

Swirl Flow Investigations on the Enhancement of Heat Transfer Processes in Cyclone Cooling Ducts

2012 ◽  
Author(s):  
Florian Wassermann ◽  
Sven Grundmann ◽  
Michael Kloss ◽  
Heinz-Peter Schiffer
Keyword(s):  
Heat Transfer ◽  
Mass Transfer ◽  
Complex Structure ◽  
Three Dimensional ◽  
Swirl Flow ◽  
Flow Structures ◽  
Stable Complex ◽  
Reynolds Analogy ◽  
Transfer Processes ◽  
Cooling Ducts

Cyclone cooling is a promising method to enhance heat-transfer processes in future internal turbine-blade leading-edge cooling-ducts. The basic component of such cooling channels is the swirl generator, which induces a swirling movement of the coolant. The angular momentum generates stable, complex and three-dimensional flow structures of helical shape with alternating axial flow directions. Full three-dimensional and three-component velocity measurements using magnetic resonance velocimetry (3D3C-MRV) were conducted, with the aim to understand the complex structure of pipe flows with strong swirl. In order to mimic the effect of different installation concepts of the cyclone-cooling ducts an idealized bend-duct swirl-tube configuration with variable exit orifices has been investigated. Pronounced helical flow structures and distinct velocity zones could be found in this swirl flow. One substantial result is the identification of stationary helix-shaped streaks of high axial velocity in the direct vicinity of the wall. These findings are in good agreement with mass-transfer measurements that also show helix-shaped structures with increased mass transfer at the inner surface of the tube. According to the Reynolds analogy between heat and mass transfer, augmented heat-transfer processes in these areas are to be expected.

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