Numerical study of steady laminar fully developed fluid flow and heat transfer in rectangular and elliptical ducts rotating about a parallel axis

Mahadevappa, Manjunatha; Rao, V.V. Bapeswara; Sastri, V. M. K.

doi:10.1016/0017-9310(95)00069-0

Cited by 20 publications

(9 citation statements)

References 4 publications

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“…(10) agrees well also with experiments of Humphreys et al [5]. Numerical simulations of complex 3D fluid flow and heat transfer phenomena in the channels rotating around a parallel axis have been successfully performed by different authors for circular, square, rectangular and elliptic cross-sections using commercial and in-house software and different RANS turbulence models [2,3,5,13,14] (here RANS stands for Reynolds-Averaged NavierStokes). For instance, Mahadevappa et al [14] have numerically studied the heat transfer in pipes with rectangular and elliptical cross-section.…”

Section: Square Rectangular and Elliptical Pipessupporting

confidence: 70%

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Numerical Study of Convective Heat Transfer Enhancement in a Pipe Rotating Around a Parallel Axis

Fasquelle¹,

Pellé

Harmand

et al. 2014

Journal of Heat Transfer

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Cooling of electrical machines is nowadays of high interest in order to improve their efficiency. In railway applications, electrical motors can be shrouded in order to avoid particles to be deposited inside. To ensure a satisfactory cooling, pipes are placed inside the rotor and are thus rotating. Improvements in convective heat transfer inside the rotating pipes were numerically investigated. Model was first validated against experimental data and after that several geometry modiflcations were tested. Influence of the angle of attack of the fluid at the inlet to the pipe was discussed and it was shown that heat transfer can be significantly increased near the pipe inlet. In addition to that changing a circular pipe with an elliptical pipe was investigated in two ways: fixing the same hydraulic diameter or the same equivalent diameter. It was shown that the cooling efficiency can be significantly increased. The best overall heat transfer enhancement of about 45% exhibited elliptic pipes located orthogonal to the rotation radius and having the same crosssection as the reference circular pipes. Results can be used by designers of electrical machines in order to choose the best cooling strategy.

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Section: Square Rectangular and Elliptical Pipessupporting

confidence: 70%

“…Fluid fiow pattem and heat transfer intensity are affected also by the form of the channel cross-section. Several studies [4][5][6][7][8][9][10][11][12][13][14] have been done for pipes with circular, square, rectangular, and elliptic…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Convective Heat Transfer Enhancement in a Pipe Rotating Around a Parallel Axis

Fasquelle¹,

Pellé

Harmand

et al. 2014

Journal of Heat Transfer

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“…They showed that, as rotation number increases, the heat transfer coefficients for all walls in both channels decreased up to 20% below those results which corresponded to nonrotating conditions. Fully developed laminar flow and heat transfer in rectangular elliptical ducts rotating about a parallel axis was studied numerically by Mahadevappa et al (1996). They indicated that elliptical geometry was superior to others, which were frequently used as cooling channels in rotating machinery.…”

Section: Introductionmentioning

confidence: 99%

Entropy generation in a channel resembling gas turbine cooling passage: Effect of rotation number and density ratio on entropy generation

Basha

AlQahtani

Yilbaş

2009

Sadhana

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Flow into a passage resembling a gas turbine blade cooling passage is considered and entropy generation rate in the passage is examined for unique rotation number and density ratios. In the simulations, leading and trailing walls of the passage are assumed to be at constant temperature. A control volume approach is introduced to discretize the governing equations of flow, heat transfer, and entropy generation. Reynolds stress turbulence model is accommodated in the simulation to account for the turbulence. The study is extended to include two rotational speeds and three density ratios. The passage aspect ratio is kept 10:1. It is found that volumetric entropy generation rate attains high values at passage inlet due to attainment of high temperature gradient in this region. Increasing rotation number and density ratio enhances volumetric entropy generation rate in the passage.

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“…They solved vorticity transport equations numerically using the power-law scheme and presented secondary flows, axial velocity and temperature contours in the entrance region at three different independent parameters consisting of Prandtl number (Pr), a combined Reynolds and rotational Reynolds number (Re·Re Ω ), and Rossby number (Ro = Re/Re Ω ). Mahadevappa and Rao [7] have done a numerical study of steady laminar fully developed flow and heat transfer in rectangular and elliptical ducts rotating about an axis parallel to the duct axis. They used a finite-difference method and presented correlations for heat transfer in rotating rectangular and elliptical ducts, indicating that elliptical geometry is superior to the others that are frequently used as coolant channels in rotating machinery.…”

Section: Introductionmentioning

confidence: 99%

A numerical investigation of flow and heat transfer in rotating U-shaped square ducts

Nobari¹,

Nousha²,

Damangir³

2009

International Journal of Thermal Sciences

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Numerical study of steady laminar fully developed fluid flow and heat transfer in rectangular and elliptical ducts rotating about a parallel axis

Cited by 20 publications

References 4 publications

Numerical Study of Convective Heat Transfer Enhancement in a Pipe Rotating Around a Parallel Axis

Numerical Study of Convective Heat Transfer Enhancement in a Pipe Rotating Around a Parallel Axis

Entropy generation in a channel resembling gas turbine cooling passage: Effect of rotation number and density ratio on entropy generation

A numerical investigation of flow and heat transfer in rotating U-shaped square ducts

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