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Статті в журналах з теми "Channel Flow with Rotation"

Автор: Grafiati

Опубліковано: 3 червня 2025

Оновлено: 31 липня 2025

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1

Parsons, James A., and Je-Chin Han. "Rotation Effect on Jet Impingement Heat Transfer in Smooth Rectangular Channels with Film Coolant Extraction." International Journal of Rotating Machinery 7, no. 2 (2001): 87–103. http://dx.doi.org/10.1155/s1023621x01000082.

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Анотація:

The effect of channel rotation on jet impingement cooling by arrays of circular jets in twin channels was studied. Impinging jet flows were in the direction of rotation in one channel and opposite to the direction of rotation in the other channel. The jets impinged normally on the smooth, heated target wall in each channel. The spent air exited the channels through extraction holes in each target wall, which eliminates cross flow on other jets. Jet rotation numbers and jet Reynolds numbers varied from 0.0 to 0.0028 and 5000 to 10,000, respectively. For the target walls with jet flow in the dir

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2

Kazachkov, Ivan V. "Stability Analysis for Complex Rotational Flow." WSEAS TRANSACTIONS ON APPLIED AND THEORETICAL MECHANICS 16 (August 10, 2021): 62–72. http://dx.doi.org/10.37394/232011.2021.16.7.

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Анотація:

Based on the earlier developed mathematical model of the complex flow due to the double rotations in two perpendicular directions, the stability analysis is performed in the paper. The Navier-Stokes equations are derived in the coordinate system rotating around the two perpendicular different axes, the vertical one of them is arranged on some distance from the other axis of rotation, the horizontal axis is directed along the tangential line to the circle of the vertical rotation. The two centrifugal and Coriolis forces create the unique features in high oscillating flow, with localities of the

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3

Speziale, C. G. "The Effect of the Earth’s Rotation on Channel Flow." Journal of Applied Mechanics 53, no. 1 (1986): 198–202. http://dx.doi.org/10.1115/1.3171711.

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The influence that the rotation of the earth has on laminar channel flow is investigated theoretically. The full nonlinear Navier-Stokes equations relative to a reference frame rotating with the earth are solved numerically for laminar flow in a rectangular channel whose axis is aligned east-west: the orientation which yields the most drastic effect. It is demonstrated that for channels of moderate width (less than 1 ft for the flow of most liquids), the rotation of the earth can give rise to a roll instability which has a severe distortional effect on the classical parabolic velocity profile.

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4

Kim, Kyung Min, Sang In Kim, Yun Heung Jeon, Dong Hyun Lee, and Hyung Hee Cho. "Detailed Heat/Mass Transfer Distributions in a Rotating Smooth Channel With Bleed Flow." Journal of Heat Transfer 129, no. 11 (2007): 1538–45. http://dx.doi.org/10.1115/1.2759974.

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In this study, the effects of bleed flow on heat/mass transfer in a rotating smooth square channel were investigated. The hydraulic diameter (Dh) of the channel was 40.0mm, and the diameter of the bleed holes (d) on the leading surface was 4.5mm. Tests were conducted under various bleed flow rates (0%, 10%, 20%) and rotation numbers (0, 0.2, 0.4), while the Reynolds number was fixed at 10,000. A naphthalene sublimation method was employed to determine the detailed heat transfer coefficients using a heat and mass transfer analogy. The results suggested heat/mass transfer characteristics in the

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5

Alfredsson, P. Henrik, and Håkan Persson. "Instabilities in channel flow with system rotation." Journal of Fluid Mechanics 202 (May 1989): 543–57. http://dx.doi.org/10.1017/s002211208900128x.

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A flow visualization study of instabilities caused by Coriolis effects in plane rotating Poiseuille flow has been carried out. The primary instability takes the form of regularly spaced roll cells aligned in the flow direction. They may occur at Reynolds numbers as low as 100, i.e. almost two orders of magnitude lower than the critical Reynolds number for Tollmien-Schlichting waves in channel flow without rotation. The development of such roll cells was studied as a function of both the Reynolds number and the rotation rate and their properties compared with results from linear spatial stabili

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6

Kumar Mondal, Pranab, and Somchai Wongwises. "Magneto-hydrodynamic (MHD) micropump of nanofluids in a rotating microchannel under electrical double-layer effect." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 234, no. 4 (2020): 318–30. http://dx.doi.org/10.1177/0954408920921697.

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We investigate the electroosmosis of nanofluid in a rotating microfluidic channel under the influence of an applied magnetic field. We bring out the rotation-induced complex flow dynamics in the channel as modulated by the nanoparticle driven modifications in the viscous drag. In particular, we observe the flow reversal at the center of the channel, emerging from an intricate competition among different forcings under consideration. We identify the critical rotation Reynolds number, signifying the critical strength of channel rotation relative to the viscous resistance to the flow, for which t

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7

Kristoffersen, Reidar, and Helge I. Andersson. "Direct simulations of low-Reynolds-number turbulent flow in a rotating channel." Journal of Fluid Mechanics 256 (November 1993): 163–97. http://dx.doi.org/10.1017/s0022112093002757.

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Direct numerical simulations of fully developed pressure-driven turbulent flow in a rotating channel have been performed. The unsteady Navier–Stokes equations were written for flow in a constantly rotating frame of reference and solved numerically by means of a finite-difference technique on a 128 × 128 × 128 computational mesh. The Reynolds number, based on the bulk mean velocity Um and the channel half-width h, was about 2900, while the rotation number Ro = 2|Ω|h/Um varied from 0 to 0.5. Without system rotation, results of the simulation were in good agreement with the accurate reference sim

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8

GRUNDESTAM, OLOF, STEFAN WALLIN, and ARNE V. JOHANSSON. "Direct numerical simulations of rotating turbulent channel flow." Journal of Fluid Mechanics 598 (February 25, 2008): 177–99. http://dx.doi.org/10.1017/s0022112007000122.

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Анотація:

Fully developed rotating turbulent channel flow has been studied, through direct numerical simulations, for the complete range of rotation numbers for which the flow is turbulent. The present investigation suggests that complete flow laminarization occurs at a rotation number Ro = 2Ωδ/Ub ≤ 3.0, where Ω denotes the system rotation, Ub is the mean bulk velocity and δ is the half-width of the channel. Simulations were performed for ten different rotation numbers in the range 0.98 to 2.49 and complemented with earlier simulations (done in our group) for lower values of Ro. The friction Reynolds nu

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9

Nitheesh, George, and M. Govardhan. "Computational Studies of Turbulent Flows in Rotating Radial and 20⁰ Backward Swept Diverging Channels." Advanced Materials Research 1016 (August 2014): 540–45. http://dx.doi.org/10.4028/www.scientific.net/amr.1016.540.

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Анотація:

Computational study is carried out in radial and 200 backward swept diverging channels rotating about the axial direction. Centrifugal and Coriolis forces, which are developed due to the rotation, affect the secondary flows and flow pattern inside the channel. Reynolds number of Re=36000 with Rotation numbers ranging from 0.0 and 1.5 are chosen for investigation. The variation of velocity and turbulence kinetic energy is studied at several locations of the curved channels. Positive Richardson numbers on the suction side indicates stabilizations of the flow. The stabilization effect increases w

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10

Dutta, S., and J. C. Han. "Local Heat Transfer in Rotating Smooth and Ribbed Two-Pass Square Channels With Three Channel Orientations." Journal of Heat Transfer 118, no. 3 (1996): 578–84. http://dx.doi.org/10.1115/1.2822671.

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This paper presents experimental heat transfer results in a two-pass square channel with smooth and ribbed surfaces. The ribs are placed in a staggered half-V fashion with the rotation orthogonal to the channel axis. The channel orientation varies with respect to the rotation plane. A change in the channel orientation about the rotating frame causes a change in the secondary flow structure and associated flow and turbulence distribution. Consequently, the heat transfer coefficient from the individual surfaces of the two-pass square channel changes. The effects of rotation number on local Nusse

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11

Шманенко, Андрей Иванович, та Сергей Иванович Сербин. "ТЕПЛООБМЕН ВО ВРАЩАЮЩЕМСЯ ГЛАДКОМ КРУГЛОМ КАНАЛЕ И ВЛИЯНИЕ НА ЕГО ИНТЕНСИВНОСТЬ ВИХРЕВОГО ТЕЧЕНИЯ". Aerospace technic and technology, № 2 (22 квітня 2019): 30–35. http://dx.doi.org/10.32620/aktt.2019.2.03.

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Анотація:

The paper deals with the analysis of heat transfer intensity in a rotating smooth channel, which simulates a cooling channel of rotating blade of the gas turbine engine. A circle cross-section channel with a diameter of 6 mm and length of 80 mm was chosen as the base variant. The calculations of heat transfer in rotating and stationary channels were carried out, which allows estimating the influence of vortex flow on the intensity of heat transfer. Rotation of the channel was simulated by means of domain rotating. The rotation speed of the test channel is 7400 rev/min. Axis of rotation is at a

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12

Hwang, Jenn-Jiang, and Dong-Yuo Lai. "Three-Dimensional Laminar Flow in a Rotating Multiple-Pass Square Channel With Sharp 180-Deg Turns." Journal of Fluids Engineering 120, no. 3 (1998): 488–95. http://dx.doi.org/10.1115/1.2820689.

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This paper presents a study of three-dimensional laminar flow in a rotating multiplepass channel connected with 180-deg sharp bends. Fluid-flow fields are calculated for the entire domain via the Navier-Stokes equations through a finite-difference scheme. For closure of this elliptic-type problem, periodical fully developed conditions are employed between the entrance and exit of the two-pass module. Experiments for the stationary two-pass channel are conducted to validate the numerical procedure and data. The emphasis of the present prediction is on the rotating and through-flow rate effects

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13

Hsieh, Shou-Shing, Ping-Ju Chen, and Hsiang-Jung Chin. "Turbulent Flow in a Rotating Two Pass Smooth Channel." Journal of Fluids Engineering 121, no. 4 (1999): 725–34. http://dx.doi.org/10.1115/1.2823530.

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Laser-Doppler anemometry has been applied to approximately 2-D turbulent air flow in a rotating 2 pass channel of square cross section. The axis of rotation is normal to the axis of the duct, and the flow is radially outward/inward. The duct is of finite length and the walls are isothermal. Smooth channels are experimentally conducted with rotational speeds of 100, 200, and 300 rpm with ReH = 5000 and 10,000. The main features of the flow, flow separation and mean velocity as well as turbulent intensity at particular location along the downstream are presented. The measured flow field is found

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14

Yang, Wen-Jei, Shin Fann, and John H. Kim. "Heat and Fluid Flow Inside Rotating Channels." Applied Mechanics Reviews 47, no. 8 (1994): 367–96. http://dx.doi.org/10.1115/1.3111084.

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Анотація:

Power generation and refrigeration accomplished by means of rotating or reciprocating machinery. One of the basic elements of rotating machinery is the rotating channel system. With the desire for ever increasing efficiency in power generation and refrigeration, higher or lower operating temperatures are achieved. It has provided motivation for the pursuit of knowledge on heat transfer and fluid flow characteristics. This paper reviews the literature pertinent to studies of fluid flow and/or heat transfer in channel flows subjected to radial rotation, parallel rotation, and coaxial revolution.

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15

Brethouwer, Geert. "Passive scalar transport in rotating turbulent channel flow." Journal of Fluid Mechanics 844 (April 4, 2018): 297–322. http://dx.doi.org/10.1017/jfm.2018.198.

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Анотація:

Passive scalar transport in turbulent channel flow subject to spanwise system rotation is studied by direct numerical simulations. The Reynolds number $Re=U_{b}h/\unicode[STIX]{x1D708}$ is fixed at 20 000 and the rotation number $Ro=2\unicode[STIX]{x1D6FA}h/U_{b}$ is varied from 0 to 1.2, where $U_{b}$ is the bulk mean velocity, $h$ the half channel gap width and $\unicode[STIX]{x1D6FA}$ the rotation rate. The scalar is constant but different at the two walls, leading to steady scalar transport across the channel. The rotation causes an unstable channel side with relatively strong turbulence a

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16

Wang, Sha, Jixian Dong, Haozeng Guo, Lijie Qiao, Shulin Zhang, and Jianyong Wang. "Experimental study on condensation friction pressure drop in rotating channels and proposal of new correlation." Thermal Science, no. 00 (2022): 111. http://dx.doi.org/10.2298/tsci220313111w.

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The multi-channel cylinder dryer uses the small channels with high heat transfer efficiency to improve the drying efficiency. In practical working conditions, the multi-channel cylinder dryer runs under the rotating state, which would greatly affect the pressure drop of inside two-phase steam. However, the condensation friction pressure drop of two-phase flow in rotating channels has not been well explored. Here in, the condensation pressure drop of two-phase steam in rotating rectangular channels are elaborately studied based on a homemade rotating experiment system. The results show that the

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17

Sengupta, Saunak, and Sukhendu Ghosh. "Linear stability of a rotating channel flow subjected to a static magnetic field." Physics of Fluids 34, no. 5 (2022): 054116. http://dx.doi.org/10.1063/5.0092870.

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Magnetohydrodynamics is effective to control the instabilities of fluid flows. This control process is cost-effective and compact because it does not require extra mechanical components. In the present study, the effect of a constant uniform magnetic field on the linear stability of a rotating channel flow is investigated. The electromagnetic field is applied in the spanwise direction alongside the axis of rotation. The Hartmann and rotation numbers characterize the magnetic and rotational effects. The axial flow is governed by the centrifugal force, and the Coriolis force due to rotation make

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18

Matsson, O. John E., and P. Henrik Alfredsson. "Curvature- and rotation-induced instabilities in channel flow." Journal of Fluid Mechanics 210 (January 1990): 537–63. http://dx.doi.org/10.1017/s0022112090001392.

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In a curved channel streamwise vortices, often called Dean vortices, may develop above a critical Reynolds number owing to centrifugal effects. Similar vortices can occur in a rotating plane channel due to Coriolis effects if the axis of rotation is normal to the mean flow velocity and parallel to the walls. In this paper the flow in a curved rotating channel is considered. It is shown from linear stability theory that there is a region for which centrifugal effects and Coriolis effects almost cancel each other, which increases the critical Reynolds number substantially. The flow visualization

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19

Park, C. W., and S. C. Lau. "Effect of Channel Orientation of Local Heat (Mass) Transfer Distributions in a Rotating Two-Pass Square Channel With Smooth Walls." Journal of Heat Transfer 120, no. 3 (1998): 624–32. http://dx.doi.org/10.1115/1.2824323.

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Naphthalene sublimation experiments have been conducted to study the effects of channel orientation, rotational Coriolis force, and a sharp turn, on the local heat (mass) transfer distributions in a two-pass square channel with a sharp turn and smooth walls, rotating about a perpendicular axis. The test channel was oriented so that the direction of rotation was perpendicular to or at a 45 deg angle to the leading and trailing walls. The Reynolds number was kept at 5,500 and the rotation number ranged up to 0.24. For the radial outward flow in the first straight pass of the diagonally oriented

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20

Hwang, G. J., and C. R. Kuo. "Experimental Studies and Correlations of Convective Heat Transfer in a Radially Rotating Serpentine Passage." Journal of Heat Transfer 119, no. 3 (1997): 460–66. http://dx.doi.org/10.1115/1.2824119.

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The present paper investigates experimentally the effects of rotation on the convective heat transfer of air flow in a radially rotating three-passage serpentine square channel. Due to rotation, the cross-stream and radial secondary flows are induced by the Coriolis force and the centrifugal-buoyancy force, respectively. The channel walls were made of low thermal conductivity material for suppressing wall heat conduction. The wall surfaces were heated individually by four separate stainless-steel film heaters to distinguish the local heat transfer rates. The hydraulic diameter and the mean rot

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21

Park, C. W., M. Kandis, and S. C. Lau. "Heat/Mass Transfer Distribution in a Rotating Two-Pass Square Channel Part I: Regional Heat Transfer, Smooth Channel." International Journal of Rotating Machinery 4, no. 3 (1998): 175–88. http://dx.doi.org/10.1155/s1023621x98000153.

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Анотація:

Naphthalene sublimation experiments have been conducted to examine the effect of rotation on the regional heat]mass transfer distribution for turbulent air flow in a rotating smooth two-pass square channel that has a 180 turn with sharp corners. The Reynolds number ranges from 5,500 to 14,500 and the rotation number goes up to 0.24. The test channel models the first two passes of serpentine internal cooling passages of gas turbine blades. Flow around a sharp turn causes larger heat]mass transfer increase in the turn and in the second pass than flow around a smooth turn. In the first pass with

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22

Lin, Frank K. T., G. J. Hwang, S. C. Wong, and C. Y. Soong. "Numerical Computation of Turbulent Flow and Heat Transfer in a Radially Rotating Channel with Wall Conduction." International Journal of Rotating Machinery 7, no. 3 (2001): 209–22. http://dx.doi.org/10.1155/s1023621x01000197.

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This work is concerned with numerical computation of turbulent flow and heat transfer in experimental models of a radially rotating channel used for turbine blade cooling. Reynolds-averaged Navier-Stokes and energy equations with a two-layer turbulence model are employed as the computational model of the flow and temperature fields. The computations are carried out by the software package of “CFX-TASCflow”. Heat loss from the channel walls through heat conduction is considered. Results at various rotational conditions are obtained and compared with the baseline stationary cases. The influences

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23

Abd-Alla, A. M., S. M. Abo-Dahab, and Abdullah Alsharif. "Peristaltic transport of a Jeffrey fluid under the effect of gravity field and rotation in an asymmetric channel with magnetic field." Multidiscipline Modeling in Materials and Structures 13, no. 4 (2017): 522–38. http://dx.doi.org/10.1108/mmms-01-2017-0002.

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Purpose The purpose of this paper is to study the peristaltic flow of a Jeffrey fluid in an asymmetric channel, subjected to gravity field and rotation in the presence of a magnetic field. The channel asymmetry is produced by choosing the peristaltic wave train on the walls to have different amplitude and phase. The flow is investigated in a wave frame of reference moving with the velocity of the wave. Involved problems are analyzed through long wavelength and low Reynolds number. Design/methodology/approach The analytical expressions for the pressure gradient, pressure rise, stream function,

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24

Scott, Julian F. "Wave turbulence in a rotating channel." Journal of Fluid Mechanics 741 (February 13, 2014): 316–49. http://dx.doi.org/10.1017/jfm.2013.652.

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AbstractThis paper describes wave-turbulence closure and its consequences for rapidly rotating (i.e. small Rossby number) turbulence confined by two infinite, parallel walls perpendicular to the rotation axis. Expressing the flow as a combination of inertial waveguide modes leads to a spectral matrix, whose diagonal elements express the distribution of energy over modes and whose off-diagonal elements represent correlations between modes of different orders. In preparation for wave-turbulence closure, the flow is decomposed into two-dimensional and wave components. The former is found to evolv

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25

Jakoby, R., S. Kim, and S. Wittig. "Correlations of the Convection Heat Transfer in Annular Channels With Rotating Inner Cylinder." Journal of Engineering for Gas Turbines and Power 121, no. 4 (1999): 670–77. http://dx.doi.org/10.1115/1.2818524.

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In the internal air system of gas turbine engines or generators, a large variety of different types of annular channels with rotating cylinders are found. Even though the geometry is very simple, the flow field in such channels can be completely three-dimensional and also unsteady. From the literature it is well-known that the basic two-dimensional flow field breaks up into a pattern of counter-rotating vortices as soon as the critical speed of the inner cylinder is exceeded. The presence of a superimposed axial flow leads to a helical shape of the vortex pairs that are moving through the chan

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26

Shen, Zhongyang, Yonghui Xie, Di Zhang, and Gongnan Xie. "Numerical Calculations on Flow and Heat Transfer in Smooth and Ribbed Two-Pass Square Channels under Rotational Effects." Mathematical Problems in Engineering 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/981376.

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Анотація:

U-shaped channel, which is also called two-pass channel, commonly exists in gas turbine internal coolant passages. Ribbed walls are frequently adopted in internal passage to enhance the heat transfer. Considering the rotational condition of gas turbine blade on operation, the effect of rotation is also investigated for the coolant channel which is close to real operation condition. Thus, the objective of this study is to discuss the effect of rotation on fluid flow and heat transfer performance of U-shaped channel with ribbed walls under high rotational numbers. Investigated Reynolds number is

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27

Al-Qahtani, Mohammad, Hamn-Ching Chen, and Je-Chin Han. "A Numerical Study of Flow and Heat Transfer in Rotating Rectangular Channels AR=4 With 45 deg Rib Turbulators by Reynolds Stress Turbulence Model." Journal of Heat Transfer 125, no. 1 (2003): 19–26. http://dx.doi.org/10.1115/1.1527907.

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Computations were performed to study three-dimensional turbulent flow and heat transfer in stationary and rotating 45 deg ribbed rectangular channels for which experimental heat transfer data were available. The channel aspect ratio (AR) is 4:1, the rib height-to-hydraulic diameter ratio e/Dh is 0.078 and the rib-pitch-to-height ratio P/e is 10. The rotation number and inlet coolant-to-wall density ratios, Δρ/ρ, were varied from 0.0 to 0.28 and from 0.122 to 0.40, respectively, while the Reynolds number was fixed at 10,000. Also, two channel orientations (β=90deg and 135 deg from the rotation

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28

Islam, Md Zohurul, Md Arifuzzaman, and Rabindra Nath Mondal. "Numerical study of Unsteady Fluid Flow and Heat Transfer Through a Rotating Curved Rectangular Channel." GANIT: Journal of Bangladesh Mathematical Society 37 (February 20, 2018): 73–92. http://dx.doi.org/10.3329/ganit.v37i0.35727.

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Numerical study of unsteady fluid flow and heat transfer through a rotating curved rectangular channel with aspect ratio 2 and curvature ratio 0.05 has been performed by using a spectral-based numerical method, and covering a wide range of the rotational parameter, the Taylor number Ta, for both the positive and negative rotation of the channel. In this paper, unsteady flow characteristics are investigated under combined action of the centrifugal, Coriolis and buoyancy forces for the Dean number De = 1000. For positive rotation, we investigated unsteady solutions for 0 ≤Ta ≤500, and it is foun

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29

Wang, Z., and R. Corral. "Numerical study of uneven wall-heating effect for a one side rib-roughened cooling channel subject to rotation." Aeronautical Journal 122, no. 1257 (2018): 1697–710. http://dx.doi.org/10.1017/aer.2018.96.

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Анотація:

ABSTRACTThis paper investigates the impact of the wall-heating conditions on the heat transfer performance of a rotating channel with one side smooth and one side roughened by 45° inclined ribs. Previous experimental and numerical studies for single-ribbed wall-heated channels showed that rotation has a significant negative impact on heat transfer performance. In order to investigate this uncommon behaviour, RANS simulations were conducted under three different wall-heating conditions in the present study: ribbed wall heated, all walls heated and adiabatic conditions. Numerical results show th

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30

Ng, Chiu-On, and Cheng Qi. "Electro-osmotic flow in a rotating rectangular microchannel." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 471, no. 2179 (2015): 20150200. http://dx.doi.org/10.1098/rspa.2015.0200.

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Анотація:

An analytical model is presented for low-Rossby-number electro-osmotic flow in a rectangular channel rotating about an axis perpendicular to its own. The flow is driven under the combined action of Coriolis, pressure, viscous and electric forces. Analytical solutions in the form of eigenfunction expansions are developed for the problem, which is controlled by the rotation parameter (or the inverse Ekman number), the Debye parameter, the aspect ratio of the channel and the distribution of zeta potentials on the channel walls. Under the conditions of fast rotation and a thin electric double laye

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31

Pascotto, Matteo, Alessandro Armellini, Luca Casarsa, Claudio Mucignat, and Pietro Giannattasio. "Effects of Rotation at Different Channel Orientations on the Flow Field inside a Trailing Edge Internal Cooling Channel." International Journal of Rotating Machinery 2013 (2013): 1–19. http://dx.doi.org/10.1155/2013/765142.

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Анотація:

The flow field inside a cooling channel for the trailing edge of gas turbine blades has been numerically investigated with the aim to highlight the effects of channel rotation and orientation. A commercial 3D RANS solver including a SST turbulence model has been used to compute the isothermal steady air flow inside both static and rotating passages. Simulations were performed at a Reynolds number equal to 20000, a rotation number (Ro) of 0, 0.23, and 0.46, and channel orientations ofγ=0∘, 22.5°, and 45°, extending previous results towards new engine-like working conditions. The numerical resul

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32

Hwang, G. J., S. C. Tzeng, and C. P. Mao. "Heat Transfer of Compressed Air Flow in a Spanwise Rotating Four-Pass Serpentine Channel." Journal of Heat Transfer 121, no. 3 (1999): 583–91. http://dx.doi.org/10.1115/1.2826019.

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Convective heat transfer of compressed air flow in a radially rotating four-pass serpentine channel is investigated experimentally in the present study. The coolant air was compressed at 5 atmospheric pressure to achieve a high rotation number and Reynolds number simultaneously. The main governing parameters are the Prandtl number, the Reynolds number for forced convection, and the rotation number for the Coriolis-force-induced cross-stream secondary flow and the Grashof number for centrifugal buoyancy. To simulate the operating conditions of a real gas turbine, the present study kept the para

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33

Wright, Lesley M., Wen-Lung Fu, and Je-Chin Han. "Influence of Entrance Geometry on Heat Transfer in Rotating Rectangular Cooling Channels (AR=4:1) With Angled Ribs." Journal of Heat Transfer 127, no. 4 (2005): 378–87. http://dx.doi.org/10.1115/1.1860564.

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Анотація:

The effect of entrance geometry on the heat transfer in rotating, narrow rectangular cooling channels is investigated in this study. Both smooth channels and channels with angled ribs are considered with three different entrance conditions: fully developed, sudden contraction, and partial sudden contraction. The rectangular channel has as aspect ratio of 4:1, and it is oriented at 135° with respect to the plane of rotation. In the test section with angled ribs, the ribs are angled at 45° to the mainstream flow. The rib height-to-hydraulic diameter ratio e/Dh is 0.078, and the rib pitch-to-heig

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34

Coletti, F., and T. Arts. "Aerodynamic investigation of a rotating rib-roughened channel by time-resolved particle image velocimetry." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 225, no. 7 (2011): 975–84. http://dx.doi.org/10.1177/0957650911410624.

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Particle image velocimetry (PIV) is used to study the turbulent flow over the rib-roughened wall of a cooling channel model in rotation. The aspect ratio is 0.9, the blockage ratio is 0.1 and the rib pitch-to-height ratio is 10. The flow direction is outward, with a Reynolds number of 1.5 × 104 and a rotation number of 0.3 in both rotational directions. The PIV system rotates with the channel, allowing to directly measure the relative flow velocity with high spatial and temporal resolution. Coriolis forces affect the stability of the shear layers: cyclonic (anticyclonic) rotation inhibits (enh

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35

YANG, Y. T., W. D. SU, and J. Z. WU. "Helical-wave decomposition and applications to channel turbulence with streamwise rotation." Journal of Fluid Mechanics 662 (August 5, 2010): 91–122. http://dx.doi.org/10.1017/s0022112010003071.

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Using helical-wave decomposition (HWD), a solenoidal vector field can be decomposed into helical modes with different wavenumbers and polarities. Here, we first review the general formulation of HWD in an arbitrary single-connected domain, along with some new development. We then apply the theory to a viscous incompressible turbulent channel flow with system rotation, including a derivation of helical bases for a channel domain. By these helical bases, we construct the inviscid inertial-wave (IW) solutions in a rotating channel and derive their existing condition. The condition determines the

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36

Parsons, J. A., J. C. Han, and C. P. Lee. "Rotation Effect on Jet Impingement Heat Transfer in Smooth Rectangular Channels With Four Heated Walls and Radially Outward Crossflow." Journal of Turbomachinery 120, no. 1 (1998): 79–85. http://dx.doi.org/10.1115/1.2841392.

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The effect of channel rotation on jet impingement cooling by arrays of circular jets in two channels was studied. Jet flow direction was in the direction of rotation in one channel and opposite to the rotation direction in the other channel. The jets impinged normally on two smooth target walls. Heat transfer results are presented for these two target walls, for the jet walls containing the jet producing orifices, and for side walls, connecting the target and jet walls. The flow exited the channels in a single direction, radially outward, creating a crossflow on jets at larger radii. The mean

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37

MARSTORP, LINUS, GEERT BRETHOUWER, OLOF GRUNDESTAM, and ARNE V. JOHANSSON. "Explicit algebraic subgrid stress models with application to rotating channel flow." Journal of Fluid Mechanics 639 (October 12, 2009): 403–32. http://dx.doi.org/10.1017/s0022112009991054.

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New explicit subgrid stress models are proposed involving the strain rate and rotation rate tensor, which can account for rotation in a natural way. The new models are based on the same methodology that leads to the explicit algebraic Reynolds stress model formulation for Reynolds-averaged Navier–Stokes simulations. One dynamic model and one non-dynamic model are proposed. The non-dynamic model represents a computationally efficient subgrid scale (SGS) stress model, whereas the dynamic model is the most accurate. The models are validated through large eddy simulations (LESs) of spanwise and st

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38

Zhao, Lihao, Niranjan R. Challabotla, Helge I. Andersson, and Evan A. Variano. "Mapping spheroid rotation modes in turbulent channel flow: effects of shear, turbulence and particle inertia." Journal of Fluid Mechanics 876 (July 31, 2019): 19–54. http://dx.doi.org/10.1017/jfm.2019.521.

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Анотація:

The rotational behaviour of non-spherical particles in turbulent channel flow is studied by Lagrangian tracking of spheroidal point particles in a directly simulated flow. The focus is on the complex rotation modes of the spheroidal particles, in which the back reaction on the flow field is ignored. This study is a sequel to the letter by Zhao et al. (Phys. Rev. Lett., vol. 115, 2015, 244501), in which only selected results in the near-wall buffer region and the almost-isotropic channel centre were presented. Now, particle dynamics all across the channel is explored to provide a complete pictu

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39

Podryabinkin, Evgeny, and Valeriy Rudyak. "Modeling of Turbulent Flows Through the Annular Channel with Eccentricity and Rotating Inner Cilinder." Siberian Journal of Physics 7, no. 4 (2012): 79–86. http://dx.doi.org/10.54362/1818-7919-2012-7-4-79-86.

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In this paper fully developed turbulent flows of Newtonian fluid in cylindrical annulus with eccentricity and rotating inner cylinder has been systematically studied. Modeling has been performed on the base of Menter Shear Transport model of turbulence in a wide range of Reynolds numbers, eccentricity, and radii ratio. As the result dependencies of flow field and pressure drop along the channel on geometrical and flow parameters have been found. It was shown that flow characteristics and dependence of the pressure drop are determined by which flow axial or rotational dominates and caused gener

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40

Podryabinkin, Evgeny, and Valeriy Rudyak. "Modeling of Turbulent Flows Through the Annular Channel with Eccentricity and Rotating Inner Cilinder." Siberian Journal of Physics 7, no. 4 (2012): 79–86. http://dx.doi.org/10.54362/10.54362/1818-7919-2012-7-4-79-86.

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Анотація:

In this paper fully developed turbulent flows of Newtonian fluid in cylindrical annulus with eccentricity and rotating inner cylinder has been systematically studied. Modeling has been performed on the base of Menter Shear Transport model of turbulence in a wide range of Reynolds numbers, eccentricity, and radii ratio. As the result dependencies of flow field and pressure drop along the channel on geometrical and flow parameters have been found. It was shown that flow characteristics and dependence of the pressure drop are determined by which flow axial or rotational dominates and caused gener

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41

Han, J. C., and Y. M. Zhang. "Effect of Uneven Wall Temperature on Local Heat Transfer in a Rotating Square Channel With Smooth Walls and Radial Outward Flow." Journal of Heat Transfer 114, no. 4 (1992): 850–58. http://dx.doi.org/10.1115/1.2911892.

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The influence of uneven wall temperature on the local heat transfer coefficient in a rotating square channel with smooth walls and radial outward flow was investigated for Reynolds numbers from 2500 to 25,000 and rotation numbers from 0 to 0.352. The square channel, composed of six isolated copper sections, has a length-to-hydraulic diameter ratio of 12. The mean rotating radius to the channel hydraulic diameter ratio is kept at a constant value of 30. Three cases of thermal boundary conditions were studied: (A) four walls uniform temperature, (B) four walls uniform heat flux, and (C) leading

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42

KHALZOV, I. V., A. I. SMOLYAKOV, and V. I. ILGISONIS. "Equilibrium magnetohydrodynamic flows of liquid metals in magnetorotational instability experiments." Journal of Fluid Mechanics 644 (January 27, 2010): 257–80. http://dx.doi.org/10.1017/s0022112009992394.

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A theoretical analysis of equilibrium magnetohydrodynamic flows in annular channels is performed from the perspective of establishing required conditions for liquid metal magnetorotational instability (MRI) experiments. Two different types of fluid rotation are considered: electrically driven flow in an annular channel and Taylor–Couette flow between rotating cylinders. The structure of these flows is studied within a unified approach as a function of the Hartmann and Reynolds numbers. The parameters appropriate for realization of MRI experiments are determined.

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43

Wallin, Stefan, Olof Grundestam, and Arne V. Johansson. "Laminarization mechanisms and extreme-amplitude states in rapidly rotating plane channel flow." Journal of Fluid Mechanics 730 (July 30, 2013): 193–219. http://dx.doi.org/10.1017/jfm.2013.300.

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AbstractFully developed plane channel flow rotating in the spanwise direction has been studied analytically and numerically. Linear stability analysis reveals that all cross-flow modes are stable for supercritical rotation numbers, $Ro\gt R{o}_{c} $, where $R{o}_{c} $ will approach 3 from below for increasing Reynolds number. Plane Tollmien–Schlichting (TS) waves are independent of rotation and always linearly unstable for supercritical Reynolds numbers. Direct numerical simulation (DNS) of the laminarization process reveals that the turbulence is damped when $Ro$ approaches $R{o}_{c} $. Hence

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44

Chang, Shyy Woei, Tong-Minn Liou, Jui-Hung Hung, and Wen-Hsien Yeh. "Heat Transfer in a Radially Rotating Square-Sectioned Duct With Two Opposite Walls Roughened by 45Deg Staggered Ribs at High Rotation Numbers." Journal of Heat Transfer 129, no. 2 (2006): 188–99. http://dx.doi.org/10.1115/1.2409988.

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This paper describes an experimental study of heat transfer in a radially rotating square duct with two opposite walls roughened by 45deg staggered ribs. Air coolant flows radially outward in the test channel with experiments to be undertaken that match the actual engine conditions. Laboratory-scale heat transfer measurements along centerlines of two rib-roughened surfaces are performed with Reynolds number (Re), rotation number (Ro), and density ratio (Δρ∕ρ) in the ranges of 7500–15,000, 0–1.8, and 0.076–0.294. The experimental rig permits the heat transfer study with the rotation number cons

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45

Fu, Wen-Lung, Lesley M. Wright, and Je-Chin Han. "Rotational Buoyancy Effects on Heat Transfer in Five Different Aspect-Ratio Rectangular Channels With Smooth Walls and 45Degree Ribbed Walls." Journal of Heat Transfer 128, no. 11 (2006): 1130–41. http://dx.doi.org/10.1115/1.2352782.

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This paper experimentally studies the effects of the buoyancy force and channel aspect ratio (W:H) on heat transfer in two-pass rotating rectangular channels with smooth walls and 45deg ribbed walls. The channel aspect ratios include 4:1, 2:1, 1:1, 1:2, and 1:4. Four Reynolds numbers are studied: 5000, 10,000, 25,000, and 40,000. The rotation speed is fixed at 550rpm for all tests, and for each channel, two channel orientations are studied: 90deg and 45 or 135deg, with respect to the plane of rotation. The maximum inlet coolant-to-wall density ratio (Δρ∕ρ)inlet is maintained around 0.12. Rib t

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46

Adhikari, S. C., R. K. Chanda, R. Akter, and R. N. Mondal. "Heat-Flux Effect on Fluid Flow and Convective Heat Transfer through a Rotating Curved Micro-Channel." Journal of Science and Technology Research 4, no. 1 (2023): 129–44. http://dx.doi.org/10.3329/jscitr.v4i1.67375.

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The present paper investigates heat-flux effect and the dissemination of energy in a rotating bent square micro-channel (MC) subject to a temperature gradient between the vertical sidewalls. The flow structure prevailing the problem is solved by applying a highly accurate spectral-based numerical scheme. The flow controlling parameters are the Dean number (0<Dn≤5000) and the Taylor number (-500 ≤ Tr ≤ 2000) for curvature 0.01 and the Grashof number, Gr=1000. After applying the arc-length path continuation technique to obtain steady solution (SS) curves, two branches of SS consisting of 2- t

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47

Ali, Hayat Adel, and Mohammed R. Salman. "Influence of rotation on peristaltic flow for pseudoplastic fluid: a wavy channel." An International Journal of Optimization and Control: Theories & Applications (IJOCTA) 14, no. 4 (2024): 336–45. http://dx.doi.org/10.11121/ijocta.1521.

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The phenomenon of rotation serves multiple purposes in cosmic and geophysical phenomena. It offers insights into the formation of galaxies and the circulation patterns of oceans. Moreover, rotational diffusion elucidates the orientation of nanoparticles within fluid mediums. Investigating the dynamics of fluid peristalsis under the influence of rotational forces holds significant relevance in addressing challenges associated with the transportation of conductive physiological fluids such as blood, polymeric materials, and saline water. This study focused on studying the impact of rotation on t

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48

Azad, Gm S., Mohammad J. Uddin, Je-Chin Han, Hee-Koo Moon, and Boris Glezer. "Heat Transfer in a Two-Pass Rectangular Rotating Channel With 45-deg Angled Rib Turbulators." Journal of Turbomachinery 124, no. 2 (2002): 251–59. http://dx.doi.org/10.1115/1.1450569.

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Анотація:

Experimental heat transfer results are presented in a two-pass rectangular channel (aspect ratio=2:1) with smooth and ribbed surfaces for two channel orientations (90 and 135 deg to the direction of rotational plane). The rib turbulators are placed on the leading and trailing sides at an angle 45 deg to the main stream flow. Both 45-deg parallel and cross rib orientations are studied. The results are presented for stationary and rotating cases at three different Reynolds numbers of 5000, 10,000, and 25,000, the corresponding rotation numbers are 0.21, 0.11, and 0.04. The rib height to hydrauli

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49

Hsieh, S. S., J. T. Huang, and C. F. Liu. "Local Heat Transfer in a Rotating Square Channel With Jet Impingement." Journal of Heat Transfer 121, no. 4 (1999): 811–18. http://dx.doi.org/10.1115/1.2826070.

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Анотація:

The influence of rotation and jet mass flow rate on the local heat transfer coefficient for a single confined impinging round jet with a fixed jet-to-wall spacing of H/d = 5 was studied for the jet Reynolds number from 6500 to 26,000 and the rotational Reynolds number from 0 to 112,000. The local heat transfer coefficient along the surface is measured and the effect of the rotation on the stagnation (peak) point, local and average Nusselt number, is presented and discussed. Furthermore, a correlation was developed for the average Nusselt number in terms of the parameters of Rej and ReΩ. In gen

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50

Chaouat, Bruno. "Simulations of Channel Flows With Effects of Spanwise Rotation or Wall Injection Using a Reynolds Stress Model." Journal of Fluids Engineering 123, no. 1 (2000): 2–10. http://dx.doi.org/10.1115/1.1343109.

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Simulations of channel flows with effects of spanwise rotation and wall injection are performed using a Reynolds stress model. In this work, the turbulent model is extended for compressible flows and modified for rotation and permeable walls with fluid injection. Comparisons with direct numerical simulations or experimental data are discussed in detail for each simulation. For rotating channel flows, the second-order turbulence model yields an asymmetric mean velocity profile as well as turbulent stresses quite close to DNS data. Effects of spanwise rotation near the cyclonic and anticyclonic

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