Convection heat transfer in the entry region of a tube which revolves about an axis parallel to itself

Humphreys, John F.; Morris, William Z.; Barrow, H.

doi:10.1016/0017-9310(67)90150-0

Cited by 32 publications

(10 citation statements)

References 6 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: 69%

“…Humphreys et al [5] studied heat transfer in developing turbulent flow over the pipe entrance length. The rotational velocity ranged between 0 and 500 rpm and the axial Reynolds number varied from 5000 to 20000.…”

Section: Circular Pipesmentioning

confidence: 99%

“…Regardless of the magnitudes of the flow and rotation velocities. their vector product and the resulting Coriolis force are zero when the vectors are parallel to each other [4][5][6]. Over the hydrodynamic initial length of the channel rotating parallel to the rotation axis, the flow is developing and velocity components orthogonal to the walls (and consequently to the angular velocity vector) are relatively high, which causes significant Coriolis effects.…”

Section: Introductionmentioning

confidence: 99%

“…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%

“…In the channels rotating around a parallel axis, rotation effects exhibit themselves via Coriolis and centrifugal buoyancy effects [2][3][4][5]. Coriolis force is proportional to the vector product of the flow velocity and angular velocity of rotation [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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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