Velocity and temperature measurements in a turbulent water-filled Taylor–Couette–Poiseuille system

Aubert, Adrien; Poncet, Sébastien; Gal, Patrice Le; Viazzo, Stéphane; Bars, Michaël Le

doi:10.1016/j.ijthermalsci.2014.12.018

Cited by 13 publications

(32 citation statements)

References 28 publications

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“…Hashemian predicated the velocity profiles and frictional pressure losses in annular yield-power-law (YPL) fluid flow by numerical methods, and found that the effect of eccentricity was more significant to the reduction of the pressure loss than the radius ratio [11]. Aubert also investigated TCP flow experimentally through laser doppler velocity (LDV) measurements [12]. He put the emphasis on the velocity profiles and heat transfer characteristics, but failed to discuss the axial pressure losses.…”

Section: Introductionmentioning

confidence: 99%

“…In this study, the axial flow resistance characteristics of TCP flow in a large Reynolds number turbulent state in a canned motor was investigated via numerical simulation and experiments. A periodic calculation domain and SST k-ω turbulence model was applied in the numerical modeling, which was validated by Yamada's experiments [4], Aubert's measurements [12], and the designed experimental test. Using simulations and experiments, a simplified model was proposed to calculate the axial frictional coefficient accompanied by TCP flow.…”

Section: Introductionmentioning

confidence: 99%

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Flow Resistance Modeling for Coolant Distribution within Canned Motor Cooling Loops

Wang

Yao

Shen

2020

Chin. J. Mech. Eng.

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Taylor-Couette-Poiseuille (TCP) flow dominates the inner water-cooling circulation of canned motor reactor coolant pumps. Current research on TCP flow focuses on torque behaviors and flow regime transitions through experiments and simulations. However, research on axial flow resistance in a large Reynolds number turbulent state is not sufficient, especially for the various flow patterns. This study is devoted to investigating the influence of annular flow on the axial flow resistance of liquid in the coaxial cylinders of the stator and rotor in canned motor reactor coolant pumps, and predicting the coolant flow distribution between the upper coil cooling loop and lower bearing lubricating loop for safe operation. The axial flow resistance, coupled with the annular rotation, is experimentally investigated at a flow rate with an axial Reynolds number, Re a , from 2.6 × 10 3 to 6.0 × 10 3 and rotational Reynolds number, Re t , from 1.6 × 10 4 to 4.0 × 10 4. It is revealed that the axial flow frictional coefficient varies against the axial flow rate in linear relation sets with logarithmic coordinates, which shift up when the flow has a higher Re t. Further examination of the axial flow resistance, with the Re a extending to 3.5 × 10 5 and Re t up to 1.6 × 10 5 , by simulation shows gentle variation rates in the axial flow frictional coefficients against the Re a. The relation curves with different Re t values converge when the Re a exceeds 3.5 × 10 5. A prediction model for TCP flow consisting of a polygonal approximation with logarithmic coordinates is developed to estimate the axial flow resistance against different axial and rotational Reynolds numbers for the evaluation of heat and mass transfer during transition states and the engineering design of the canned motor chamber structure.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Flow Resistance Modeling for Coolant Distribution within Canned Motor Cooling Loops

Wang

Yao

Shen

2020

Chin. J. Mech. Eng.

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“…Tachibana and Fukui (1964) proposed empirical correlation with and without slots on the inner cylinder surface for Re=380-4200 and Ta =120-5900. Aubert et al (2015) performed heat transfer experiment for Re=7500-11200 and Ta =3350-9430 and proposed empirical correlation in which the Nusselt number was expressed as NuRe Fénot et al (2011) reviewed previous studies on the heat transfer characteristics in the Taylor-Couette flow with and without through-flow in detail. They reported that the heat transfer characteristics in the Taylor-Couette-Poiseuille flow depended not only on the global parameters (the Taylor number, the through-flow Reynolds number and the geometry of the system) but also on the entrance conditions for the through flow.…”

Section: Introductionmentioning

confidence: 99%

“…They reported that the heat transfer characteristics in the Taylor-Couette-Poiseuille flow depended not only on the global parameters (the Taylor number, the through-flow Reynolds number and the geometry of the system) but also on the entrance conditions for the through flow. Aubert et al (2015) reported that the Nusselt number near the entrance was much higher than that near the center in the axial direction, which was due to the developing nature of the flow. The variation of the Nusselt number in the axial direction was confirmed by large eddy simulation of Murata and Iwamoto (2011) for Re=1000 and Ta =4000.…”

Section: Introductionmentioning

confidence: 99%

“…The coefficient of r i /r o appears in order to keep mean fluid temperature constant in the axial direction. Because entrance conditions have some effects on the heat transfer as reported in Fénot et al (2011) and Aubert et al (2015), periodic boundary condition in the z direction was adopted to exclude the entrance effect and to achieve fully developed condition. Computational domain size was adopted to be 90 in the circumferential direction and axial length, L=18H, was twice as that of the authors' previous paper (Ohsawa et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

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Through-flow effects on Nusselt number and torque coefficient in Taylor-Couette-Poiseuille flow investigated by large eddy simulation

Ohsawa

Murata

Iwamoto

2016

JTST

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Flow in a concentric annular passage with a rotating inner cylinder, which is called Taylor-Couette flow, is important in industrial applications, such as electric motor which requires not only effective cooling of rotating shaft but also saving power required for the axis rotation. When the through flow is superposed, which is called Taylor-Couette-Poiseuille flow, it affects the cooling efficiency and the torque required for the axis rotation. To the authors' knowledge, previous studies have been focused on either the Nusselt number or the torque coefficient in the Taylor-Couette-Poiseuille flow. Therefore, it is difficult to estimate the through-flow effects on both of them under the same geometry and flow conditions. In this study, the through-flow effects on both the Nusselt number and the torque coefficient in the Taylor-Couette-Poiseuille flow under the same geometry and flow conditions were investigated by performing large eddy simulation. The through-flow Reynolds number, Re, was varied from 500 to 8000 under constant Taylor and Prandtl numbers of Ta=4000 and Pr=0.71, respectively. The Nusselt number and the torque coefficient had similar trend to each other with the increase of Re. They decreased by 25% for the change of Re from 0 to 1000 and were nearly constant for the change of Re from 4000 to 8000. Contribution of the advection, turbulent transport and diffusion terms to the Nusselt number and the torque coefficient were evaluated by using the equations proposed by the authors. The contribution of the advection term was nearly zero for Re from 500 to 8000, which was contrary to the case without through-flow (Re=0). As Re increased, the contribution of the turbulent transport term decreased but that of the diffusion term did not change so much. The friction factor in the axial direction varied as Re -0.75 of which power was between laminar (Re -1 ) and turbulent (Re -0.25 ) correlations in a smooth stationary pipe flow.

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The Axial Heat Transfer Behavior Based Upon Taylor Vortex in Annular Fluid Flow with Rotating Inner Cylinder

Wang

Jin

Yao

et al. 2023

Lecture Notes in Civil Engineering

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Velocity and temperature measurements in a turbulent water-filled Taylor–Couette–Poiseuille system

Cited by 13 publications

References 28 publications

Flow Resistance Modeling for Coolant Distribution within Canned Motor Cooling Loops

Flow Resistance Modeling for Coolant Distribution within Canned Motor Cooling Loops

Through-flow effects on Nusselt number and torque coefficient in Taylor-Couette-Poiseuille flow investigated by large eddy simulation

The Axial Heat Transfer Behavior Based Upon Taylor Vortex in Annular Fluid Flow with Rotating Inner Cylinder

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