Characterization of the Flow Field inside a Rotating, Rib-Roughened, U-Shaped Channel using Particle Image Velocimetry

Brossard, Christophe; Servouze, Y.; Gicquel, P.; Barrier, Raphaël

doi:10.1109/iciasf.2005.1569936

Cited by 4 publications

(3 citation statements)

References 14 publications

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“…The heat transfer effect of the rib-protrusion structure was much stronger than that of the rib channel under rotation, especially in the inlet section. C. Brossard [11] et al used the PIV method to study the flow field characteristics of the rotating ribbed U-channel and found that the rotation caused the heat transfer characteristics of the leading and trailing sides of the channel to be inconsistent. M. Gallo [12] et al studied the flow and heat transfer of a smooth U-channel with a 1:1 aspect ratio.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of turbulent flow in a two-pass channel with different U-shaped bends

Liu

You

et al. 2020

AIP Advances

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In this paper, the TR-PIV method is used to study the internal flow field characteristics in U-shaped channels. The Reynolds number, based on the square cross section channel hydraulic diameter is 8888,13333 and 17777. Mean flow, Reynolds stress and POD are taken into consideration to investigate the flow characteristic with three different turning sections. Through analysis, a series of important conclusions have been drawn. For the main flow, the structure of turning sections has obvious influence on the characteristics of flow field. The size and number of vortices in the corner area are significantly reduced, because the increase in Reynolds number makes the influx impact stronger. It can be seen from the Reynolds stress distribution which is obviously different in different turning sections that the pulsation caused by the mixing of the main flow and the vortex is obviously stronger than that at the boundary. The flow at the turning section is complex, the distribution of the proportion of turbulent kinetic energy in the low-order mode is relatively gentle, and there is an obvious wavy structure at the turning section of the inner circle and outer circular passage, which matches the velocity field from the POD.

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Section: Introductionmentioning

confidence: 99%

Experimental investigation of turbulent flow in a two-pass channel with different U-shaped bends

Liu

You

et al. 2020

AIP Advances

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“…With the same technique, and Liou and Chen (1999b) measured the turbulent flow field in a square ended U-bend with the axis of rotation orthogonal to the axis of the curve and performed measurements of the local heat transfer coefficient with the aim of identifying possible correlations. Brossard et al (2005) conducted PIV experiments in a channel with geometry similar to the ones used in the two last cited works and analyzed the flow field in planes parallel to the dividing wall and orthogonal to the axis of rotation.…”

Section: Introductionmentioning

confidence: 99%

3D reconstruction of the flow and vortical field in a rotating sharp “U” turn channel

Gallo

Astarita

2009

Exp Fluids

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Particle image velocimetry experiments have been carried out to obtain visualizations and measurements of the main and secondary flow fields in a square channel with a sharp ''U'' turn. Both the main and the secondary flow fields have been used to perform a 3D reconstruction of the mean flow and vortical fields in the turn region and in the outlet duct. In order to study the influence of the rotation, tests both in stationary (absence of rotation, Re = 20,000) and in rotating (Re = 20,000 and Ro = 0.3) conditions have been performed. The results show that the Coriolis and centrifugal forces, caused by the rotation, yield strong modifications to the symmetrical flow and vortical fields that are generated, in the static case, only by the abrupt inversion of the flow direction. Abbreviations 3D Three-dimensional CCD Charge-coupled device LASER Light amplification by stimulated emission of radiation LDA Laser doppler anemometry Nd:YAG Neodymium yttrium aluminium garnet PIV Particle image velocimetry List of symbols C Circuit used to the evaluation of the vorticity components D Channel hydraulic diameter l Direction normal to the planar surface S Re Reynolds number Ro Rotation number S Planar surface bounded by the circuit C U Fluid mean velocity u, v, w Mean velocity components u 0 , v 0 Turbulence intensity u* Wall friction velocity u 1 , w 1 Mean velocity components obtained from the images acquired with the rotating channel (Re = 20,000, Ro = 0.3) u 2 , w 2 Mean velocity components obtained from the images acquired with the rotating channel and the fluid at rest U 2 , W 2 Velocity components of V pp u g , v g , w g Mean velocity components relative to the 3D grids V Local velocity vector V Local velocity module V pp Rotation peripheral velocity relative to the generic point of the investigated plane W 2m Spatial average of the mean (in time) velocity component w 2 distribution obtained from the images acquired with the rotating channel and with the fluid at rest x, y, z Cartesian spatial coordinates x c , z c Cartesian spatial coordinates of the channel rotation centre a Rotation angle Electronic supplementary material The online version of this article (

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“…The influence of pressure on the flow field is also involved. Brossard et al 6 studied a rotating U-shaped smooth channel with 60° parallel ribs inside with PIV (Particle Image Velocimetry). Although these PIV measure-ments were obtained without buoyancy effects, they could be used for comparison with results from numerical simulations.…”

mentioning

confidence: 99%

Experimental Investigation on Velocity and Temperature Field in a Rotating Non-isothermal Turbulent Boundary Layer using Hot-wire

Gangfu

You

et al. 2020

Sci Rep

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This experiment measured the instantaneous temperature and velocity field synchronously in nonisothermal turbulent boundary layer in a rotating straight channel with a parallel-array hot-wire probe. the Reynolds number based on the bulk mean velocity (U) and hydraulic diameter (D) is 19000, and the rotation numbers are 0, 0.07, 0.14, 0.21 and 0.28. The mean velocity u and mean temperature T as well as their fluctuating quantity u' and T' were measured at three streamwise locations (x/D = 4.06, 5.31, 6.56). A method for temperature-changing calibration with constant temperature hot-wire anemometers was proposed. it achieved the calibration in operational temperature range (15.5 °C-50 °C) of the hot-wire via a home-made heating section. The measurement system can obtain the velocity and temperature in a non-isothermal turbulent boundary layer at rotating conditions. The result analysis mainly contains the dimensionless mean temperature, temperature fluctuation as well as its skewness and flatness and streamwise turbulent heat flux. For the trailing side, the rotation effect is more obvious, and makes the dimensionless temperature profiles lower than that under static conditions. The dimensionless streamwise heat flux shows a linear decrease trend in the boundary layer. It is hoped that this research can improve our understanding of the flow and heat transfer mechanism in the internal cooling passages of turbine rotor blades.

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Characterization of the Flow Field inside a Rotating, Rib-Roughened, U-Shaped Channel using Particle Image Velocimetry

Cited by 4 publications

References 14 publications

Experimental investigation of turbulent flow in a two-pass channel with different U-shaped bends

Experimental investigation of turbulent flow in a two-pass channel with different U-shaped bends

3D reconstruction of the flow and vortical field in a rotating sharp “U” turn channel

Experimental Investigation on Velocity and Temperature Field in a Rotating Non-isothermal Turbulent Boundary Layer using Hot-wire

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