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Journal articles on the topic 'Ribbed channel'

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Published: 4 June 2021

Last updated: 1 February 2022

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1

Han, J. C. "Heat Transfer and Friction Characteristics in Rectangular Channels With Rib Turbulators." Journal of Heat Transfer 110, no. 2 (1988): 321–28. http://dx.doi.org/10.1115/1.3250487.

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The effect of the channel aspect ratio on the distribution of the local heat transfer coefficient in rectangular channels with two opposite ribbed walls (to simulate turbine airfoil cooling passages) was determined for a Reynolds number range of 10,000 to 60,000. The channel width-to-height ratios (W/H, ribs on side W) were 1/4, 1/2, 1, 2, and 4. The test channels were heated by passing current through thin, stainless steel foils instrumented with thermocouples. The local heat transfer coefficients on the ribbed side wall and on the smooth side wall of each test channel from the channel entran

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2

Lee, M. S., S. S. Jeong, and Soo Whan Ahn. "Thermal Performances in Ribbed Rectangular Convergent and Divergent Channels." Applied Mechanics and Materials 479-480 (December 2013): 249–53. http://dx.doi.org/10.4028/www.scientific.net/amm.479-480.249.

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The rectangular convergent/divergent channels with one sided ribbed surface only have the inclination angles of 0.72oand1.43o at which the ribbed wall is manufactured with a fixed rib height ( e) =10 mm and the ratio of rib spacing (p) to height ( e) =10. The comparison shows that among the four channels (Dho/Dhi =0.67, 0.86, 1.16, and1.49) the divergent channel of Dho/Dhi =1.49 has the highest thermal performance at the identical mass flow rate, and the divergent channel of Dho/Dhii =1.16 has the highest at the identical pumping power and static pressure drop.

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3

Kang, H. K., S. W. Ahn, S. T. Bae, and D. H. Lee. "Analysis of the heat transfer and friction in a ribbed square channel using numerical and experimental methods." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering 221, no. 3 (2007): 151–59. http://dx.doi.org/10.1243/09544089jpme112.

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Numerical predictions and experiment of a hydrodynamic and thermally developed turbulent flow through square channels with one or two ribbed walls were performed to determine the pressure drop and heat transfer. The CFX (version 5.7) software package was used for the computations. The rough wall had 45°-inclined square ribs. All four walls in the channel were heated, and a uniform heat flux was maintained on the entire inner heat transfer channel area. Experimental data were also obtained for four Reynolds numbers ranging from 7600 to 24 900, a pitch-to-rib-height ratio of 8.0, and a rib-heigh

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4

Zhang, Y. M., W. Z. Gu, and J. C. Han. "Heat Transfer and Friction in Rectangular Channels With Ribbed or Ribbed-Grooved Walls." Journal of Heat Transfer 116, no. 1 (1994): 58–65. http://dx.doi.org/10.1115/1.2910884.

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The effect of compound turbulators on friction factors and heat transfer coefficients in rectangular channels with two opposite ribbed-grooved walls was determined for a Reynolds number range of 10,000 to 50,000. The channel width-to-height ratio was 10. The fully developed heat transfer coefficients and friction factors on the ribbed-grooved and smooth side walls of each test channel were measured for six rib-groove spacings (p/e = 8, 10, 15, 20, 25, and 30). The fully developed friction and heat transfer in similar aspect ratio rectangular channels with two opposite ribbed walls with two rib

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5

Hwang, Jenn-Jiang, and Tong-Miin Liou. "Heat Transfer and Friction in a Low-Aspect-Ratio Rectangular Channel with Staggered Slit-Ribbed Walls." International Journal of Rotating Machinery 4, no. 4 (1998): 283–91. http://dx.doi.org/10.1155/s1023621x98000244.

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Fully developed heat transfer and friction in a rectangular channel with slit-ribbed walls are examined experimentally. The slit ribs are transversely arranged on the bottom and top channel walls in a staggered manner. Effects of rib open-area ratio (β= 24%, 37%, and 46%), rib pitch-to-height ratio(Pi/H=10,15and20), and Reynolds number(10,000≤Re≤50,000)are examined. The rib height-to-channel hydraulic diameter ratio is fixed atH/De=0.081. It is disclosed that the heat transfer coefficient for the slit-ribbed channel is higher than that for the solid-ribbed channel, and increases with rib open-

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6

Hwang, Jenn-Jiang, and Tong-Miin Liou. "Augmented Heat Transfer in a Rectangular Channel With Permeable Ribs Mounted on the Wall." Journal of Heat Transfer 116, no. 4 (1994): 912–20. http://dx.doi.org/10.1115/1.2911466.

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Turbulent heat transfer and friction in a rectangular channel with perforated ribs arranged on one of the principal walls are investigated experimentally. The effects of rib open-area ratio, rib pitch-to-height ratio, rib height-to-channel hydraulic diameter ratio, and flow Reynolds number are examined. To facilitate comparison, measurements for conventional solid-type ribs are also conducted. Laser holographic interferometry is employed to determine the rib permeability and measure the heat transfer coefficients of the ribbed wall. Results show that ribs with appropriately high open-area rati

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7

Hwang, Jenn-Jiang, and Tong-Miin Liou. "Heat Transfer Augmentation in a Rectangular Channel With Slit Rib-Turbulators on Two Opposite Walls." Journal of Turbomachinery 119, no. 3 (1997): 617–23. http://dx.doi.org/10.1115/1.2841167.

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The effect of slit ribs on heat transfer and friction in a rectangular channel is investigated experimentally. The slit ribs are arranged in-line on two opposite walls of the channel. Three rib open-area ratios (β = 24, 37, and 46 percent), three rib pitch-to-height ratios (Pi/H = 10, 20, and 30), and two rib height-to-channel hydraulic diameter ratios (H/De = 0.081, and 0.162) are examined. The Reynolds number ranges from 10,000 to 50,000. Laser holographic interferometry is employed to measure the local heat transfer coefficients of the ribbed wall quantitatively, and observe the flow over t

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8

Sivakumar, Karthikeyan, N. Kulasekharan, and E. Natarajan. "Computational Investigations in Rectangular Convergent and Divergent Ribbed Channels." International Journal of Turbo & Jet-Engines 35, no. 2 (2018): 193–201. http://dx.doi.org/10.1515/tjj-2016-0032.

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Abstract Computational investigations on the rib turbulated flow inside a convergent and divergent rectangular channel with square ribs of different rib heights and different Reynolds numbers (Re=20,000, 40,000 and 60,000). The ribs were arranged in a staggered fashion between the upper and lower surfaces of the test section. Computational investigations are carried out using computational fluid dynamic software ANSYS Fluent 14.0. Suitable solver settings like turbulence models were identified from the literature and the boundary conditions for the simulations on a solution of independent grid

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9

Han, J. C., P. R. Chandra, and S. C. Lau. "Local Heat/Mass Transfer Distributions Around Sharp 180 deg Turns in Two-Pass Smooth and Rib-Roughened Channels." Journal of Heat Transfer 110, no. 1 (1988): 91–98. http://dx.doi.org/10.1115/1.3250478.

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The detailed mass transfer distributions around the sharp 180 deg turns in a two-pass, square, smooth channel and in an identical channel with two rib-roughened opposite walls were determined via the napthalene sublimation technique. The top, bottom, inner (divider), and outer walls of the test channel were napthalene-coated surfaces. For the ribbed channel tests, square, transverse, brass ribs were attached to the top and bottom walls of the channel in alignment. The rib height-to-hydraulic diameter ratios (e/D) were 0.063 and 0.094; the rib pitch-to-height ratios (P/e) were 10 and 20. Experi

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10

Lee, Myung Sung, and Soo Whan Ahn. "Thermal Performance in a Rectangular Divergent Channel with Parallel Angled Ribs." Applied Mechanics and Materials 764-765 (May 2015): 403–7. http://dx.doi.org/10.4028/www.scientific.net/amm.764-765.403.

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Heat transfer and friction factors of fully developed turbulent flows in the stationary rectangular divergent channel with parallel angled ribbed have been investigated experimentally. Four different parallel angled ribs (α = 30, 45, 60, and 90-deg) are placed to the channel’s two opposite walls as well as to the channel’s one sided wall only, respectively. The ribbed rectangular divergent channel has the inclination angle of 0.72deg at the left and right walls, corresponding to Dho/Dhi =1.16. The divergent channel has the cross-section of100 x75 mm2 at inlet and 100 x 100 mm2 at exit. The rib

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11

Narasimhamurthy, Vagesh D., and Helge I. Andersson. "Turbulence statistics in a rotating ribbed channel." International Journal of Heat and Fluid Flow 51 (February 2015): 29–41. http://dx.doi.org/10.1016/j.ijheatfluidflow.2014.10.008.

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12

Liu, Jia Zeng, Jian Min Gao, Tie Yu Gao, and Jiao Jun Shi. "Heat Transfer in Narrow Rectangular Channels with Rib Turbulators." Advanced Materials Research 354-355 (October 2011): 1245–51. http://dx.doi.org/10.4028/www.scientific.net/amr.354-355.1245.

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An experimental study of heat transfer characteristics of narrow rectangular channels with rib turbulators for Re in the range of 10000-60000 was performed. To simulate the actual geometry and heat transfer structure of blade/vane internal cooling passage, each of the test channels was welded by four stainless steel plates. Because of the three dimensional heat conduction in the walls and heat conduction between the ribbed and smooth walls, the measured temperature distribution along the axial direction of the test channel is a smooth continuous curve, and when the Re is low, the average Nu of

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13

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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14

Hsieh, Shou-Shing, and Hsiang-Jung Chin. "Turbulent Flow in a Rotating Two Pass Ribbed Rectangular Channel." Journal of Turbomachinery 125, no. 4 (2003): 609–22. http://dx.doi.org/10.1115/1.1622714.

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Laser-Doppler anemometry has been applied to approximately two-dimensional turbulent air flow in rotating two pass channel with turbulator of rectangular cross section (AR=3:1). 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. Two sided oppositely ribbed channel including one sided ribbed U bend of p/e=8 at e/DH=0.27 are experimentally conducted with ReD=5000 and 10,000. The main features of the flow, reattachment length, recirculation zone, and mean velocity as well as turbulent intensit

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15

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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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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16

Elwekeel, Fifi N. M., Antar M. M. Abdala, and Qun Zheng. "Numerical Investigation of Heat Transfer Enhancement with Mist Injection." Applied Mechanics and Materials 281 (January 2013): 250–53. http://dx.doi.org/10.4028/www.scientific.net/amm.281.250.

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In the present work, computational simulations was made using ANSYS CFX to predict the improvements of internal heat transfer in rectangular ribbed channel using different coolants. Several coolants such as air, steam, air/mist and steam/mist were investigated. The shear stress transport (SST) turbulence model is selected by comparing the predictions of different turbulence models with experimental results. The results indicate that the heat transfer coefficients enhance in ribbed channel at injection small amount of mist. The heat transfer coefficients of air/mist, steam and steam/mist increa

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17

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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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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18

Chandra, P. R., M. E. Niland, and J. C. Han. "Turbulent Flow Heat Transfer and Friction in a Rectangular Channel With Varying Numbers of Ribbed Walls." Journal of Turbomachinery 119, no. 2 (1997): 374–80. http://dx.doi.org/10.1115/1.2841121.

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An experimental study of wall heat transfer and friction characteristics of a fully developed turbulent air flow in a rectangular channel with transverse ribs on one, two, and four walls is reported. Tests were performed for Reynolds numbers ranging from 10,000 to 80,000. The pitch-to-rib height ratio, P/e, was kept at 8 and rib height-to-channel hydraulic diameter ratio, e/Dh, was kept at 0.0625. The channel length-to-hydraulic diameter ratio, L/Dh, was 15. The heat transfer coefficient and friction factor values were enhanced with the increase in the number of ribbed walls. The friction roug

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19

Liou, Tong-Miin, Wen-Bin Wang, and Yuan-Jen Chang. "Holographic Interferometry Study of Spatially Periodic Heat Transfer in a Channel With Ribs Detached From One Wall." Journal of Heat Transfer 117, no. 1 (1995): 32–39. http://dx.doi.org/10.1115/1.2822319.

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The effects of clearance ratio (C/H) and Reynolds number (Re) on the turbulent heat transfer and friction in a rectangular duct with ribs detached from one wall were characterized quantitatively using laser holographic interferometry and pressure measurements. The investigated flow was periodic in space both hydrodynamically and thermally. C/H and Re were varied from 0.25 to 1.5 and 5 × 103 to 5 × 104, respectively. The obtained interferograms, local (Nu) and average (Nu) Nusselt number, and thermal performance (Nup/Nus*) allowed the critical C/H characterizing different mechanisms of heat tra

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20

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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21

Tarasevich, S. E., A. V. Shishkin, and A. A. Giniyatullin. "Heat Transfer in a Channel with Ribbed Twisted Tapes." High Temperature 58, no. 1 (2020): 107–11. http://dx.doi.org/10.1134/s0018151x20010216.

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22

LABBÉ, O., J. RYAN, and P. SAGAUT. "Direct Numerical Simulation of Flow in a Ribbed Channel." International Journal of Computational Fluid Dynamics 11, no. 3-4 (1999): 275–84. http://dx.doi.org/10.1080/10618569908940880.

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23

TAKAHASHI, Toshihiko, and Kazunori WATANABE. "534 LES of Ribbed Channel Flow and Heat Transfer." Proceedings of The Computational Mechanics Conference 2001.14 (2001): 601–2. http://dx.doi.org/10.1299/jsmecmd.2001.14.601.

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24

Zhang, Bo, Quan Hong, Yuanyuan Dou, Honghu Ji, and Rui Chen. "Experimental investigation of flow and heat transfer characteristics on matrix ribbed channel." Thermal Science 24, no. 3 Part A (2020): 1593–600. http://dx.doi.org/10.2298/tsci190702026z.

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The effect of the rib width to height ratio t/e and width to pitch ratio t/p on the local heat transfer distribution in a rectangular matrix ribbed channel with two opposite in line 45? ribs are experimentally investigated for Reynolds numbers from 54000 to 150000. The rib height to channel height ratio e/H is 0.5, t/p and t/e both varies in range of 0.3-0.5. To simulate the actually situation in turbine blades, and provide useful direct results for turbine blade designers, the parameters are same with the blade. The experiments results show that, in comparison to fully developed flow in a smo

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25

Han, J. C., Y. M. Zhang, and C. P. Lee. "Influence of Surface Heat Flux Ratio on Heat Transfer Augmentation in Square Channels With Parallel, Crossed, and V-Shaped Angled Ribs." Journal of Turbomachinery 114, no. 4 (1992): 872–80. http://dx.doi.org/10.1115/1.2928042.

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The effect of wall heat flux ratio on the local heat transfer augmentation in a square channel with two opposite in-line ribbed walls was investigated for Reynolds numbers from 15,000 to 80,000. The square channel composed of ten isolated copper sections has a length-to-hydraulic diameter ratio (L/D) of 20. The rib height-to-hydraulic diameter ratio (e/D) is 0.0625 and the rib pitch-to-height ratio (P/e) equals 10. Six ribbed side to smooth side wall heat flux ratios (Case 1—q″r1/q″s = q″r2/q″s = 1; Case 2—q″r1/q″s = q″r2/q″s = 3; Case 3—q″r1/q″s = q″r2/q″s = 6; Case 4—q″r1/q″s = 6 and q″r2/q″

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26

Zaw, Myo Min, Liang Zhu, and Ronghui Ma. "Effect of Surface Topography on Particle Deposition from Liquid Suspensions in Channel Flow." Fluids 5, no. 1 (2020): 8. http://dx.doi.org/10.3390/fluids5010008.

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A Eulerian—Lagrangian model has been developed to simulate particle attachment to surfaces with arc-shaped ribs in a two-dimensional channel flow at low Reynolds numbers. Numerical simulation has been performed to improve the quantitative understanding of how rib geometries enhance shear rates and particle-surface interact for various particle sizes and flow velocities. The enhanced shear rate is attributed to the wavy flows that develop over the ribbed surface and the weak vortices that form between adjacent ribs. Varying pitch-to-height ratio can alter the amplitude of the wavy flow and the

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27

Lo Iacono, G., P. G. Tucker, and A. M. Reynolds. "Predictions for particle deposition from LES of ribbed channel flow." International Journal of Heat and Fluid Flow 26, no. 4 (2005): 558–68. http://dx.doi.org/10.1016/j.ijheatfluidflow.2005.03.004.

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28

Chandra, P. R., J. C. Han, and S. C. Lau. "Effect of Rib Angle on Local Heat/Mass Transfer Distribution in a Two-Pass Rib-Roughened Channel." Journal of Turbomachinery 110, no. 2 (1988): 233–41. http://dx.doi.org/10.1115/1.3262186.

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The heat transfer characteristics of turbulent air flow in a two-pass channel were studied via the naphthalene sublimation technique. The test section, which consisted of two straight, square channels joined by a sharp 180 deg turn, resembled the internal cooling passages of gas turbine airfoils. The top and bottom surfaces of the test channel were roughened by rib turbulators. The rib height-to-hydraulic diameter ratio (e/D) was 0.063 and the rib pitch-to-height ratio (P/e) was 10. The local heat/mass transfer coefficients on the roughened top wall, and on the smooth divider and side walls of

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29

Griffith, Todd S., Luai Al-Hadhrami, and Je-Chin Han. "Heat Transfer in Rotating Rectangular Cooling Channels AR=4 With Angled Ribs." Journal of Heat Transfer 124, no. 4 (2002): 617–25. http://dx.doi.org/10.1115/1.1471525.

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An investigation into determining the effect of rotation on heat transfer in a rib-roughened rectangular channel with aspect ratio of 4:1 is detailed in this paper. A broad range of flow parameters have been selected including Reynolds number (Re=5000–40000), rotation number (Ro=0.04–0.3) and coolant to wall density ratio at the inlet Δρ/ρi=0.122. The rib turbulators, attached to the leading and trailing surface, are oriented at an angle α=45deg to the direction of flow. The effect of channel orientations of β=90 deg and 135 deg with respect to the plane of rotation is also investigated. Resul

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30

Agarwal, Peeyush, Sumanta Acharya, and D. E. Nikitopoulos. "Heat Transfer in 1:4 Rectangular Passages With Rotation." Journal of Turbomachinery 125, no. 4 (2003): 726–33. http://dx.doi.org/10.1115/1.1626683.

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The paper presents an experimental study of heat/mass transfer coefficient in 1:4 rectangular channel with smooth or ribbed walls for Reynolds number in the range of 5000–40,000 and rotation numbers in the range of 0–0.12. Such passages are encountered close to the mid-chord sections of the turbine blade. Normal ribs (e/Dh=0.3125 and P/e=8) are placed on the leading and the trailing sides only. The experiments are conducted in a rotating two-pass coolant channel facility using the naphthalene sublimation technique. For purposes of comparison, selected measurements are also performed in a 1:1 c

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31

Chang, S. W., and L. M. Su. "Influence of Reciprocating Motion on Heat Transfer Inside a Ribbed Duct with Application to Piston Cooling in Marine Diesel Engines." Journal of Ship Research 41, no. 04 (1997): 332–39. http://dx.doi.org/10.5957/jsr.1997.41.4.332.

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This paper presents the results of an experimental study aimed at investigating the effect of reciprocating motion on the heat transfer for the flow inside a square ribbed enclosure. This flow configuration was a modification of the modern cooling system within a reciprocating piston of a marine heavy diesel engine. Initially, the heat transfer characteristics for the ribbed duct flow were examined and validated by comparing the present data with the relevant publications. Significant heat transfer enhancements detected from the nonreciprocating forced convection tests suggested the potential

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32

Fusegi, Toru. "Turbulent Flow Calculations of Mixed Convection in a Periodically-Ribbed Channel." Journal of Enhanced Heat Transfer 2, no. 4 (1995): 295–305. http://dx.doi.org/10.1615/jenhheattransf.v2.i4.50.

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Fossa, M., M. Misale, and G. Tanda. "Schlieren visualization of water natural convection in a vertical ribbed channel." Journal of Physics: Conference Series 655 (November 16, 2015): 012005. http://dx.doi.org/10.1088/1742-6596/655/1/012005.

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34

Coletti, Filippo, Irene Cresci, and Tony Arts. "Spatio-temporal analysis of the turbulent flow in a ribbed channel." International Journal of Heat and Fluid Flow 44 (December 2013): 181–96. http://dx.doi.org/10.1016/j.ijheatfluidflow.2013.05.020.

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35

Liu, Jiazeng, Jianmin Gao, and Tieyu Gao. "Forced convection heat transfer of steam in a square ribbed channel." Journal of Mechanical Science and Technology 26, no. 4 (2012): 1291–98. http://dx.doi.org/10.1007/s12206-012-0201-5.

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36

Weihing, P., B. A. Younis, and B. Weigand. "Heat transfer enhancement in a ribbed channel: Development of turbulence closures." International Journal of Heat and Mass Transfer 76 (September 2014): 509–22. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2014.04.052.

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37

Kargin, Vladimir Rodionovich, and Boris Vladimirovich Kargin. "Determination of One-Channel Press Dies Operating Corbels." Key Engineering Materials 684 (February 2016): 7–12. http://dx.doi.org/10.4028/www.scientific.net/kem.684.7.

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The dimensions calculation methods of one-channel dies operating corbels for solid profiles pressing are described, these methods are based on similarity theory and dimensional analysis. According to these methods, setting dimensions of the operating corbel on the K profile section, it is possible to calculate operating corbels dimensions on each other section of the i profile, depending on their position relative to the die center, ensuring the outflow evenness. Calculation example of the die operating corbels for the pressing of the ribbed profile made of AV alloy is given.

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38

Jeon, Shinyoung, and Changmin Son. "Comparative Numerical Study of the Influence of Film Hole Location of Ribbed Cooling Channel on Internal and External Heat Transfer." Energies 14, no. 15 (2021): 4689. http://dx.doi.org/10.3390/en14154689.

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The influence of film-hole position on internal and external heat transfer was investigated using Computational Fluid Dynamics (CFD). A simplified geometry of an integrated configuration of a ribbed channel, film hole and mainstream passage is modeled to represent a turbine internal and external cooling scheme. The proposed configurations with nine different positions of film holes are parameterized to conduct a series of CFD calculations at a target blowing ratio of 0.8, 1.1 and 1.7. Since the present study is taking a comparative approach, CFX with SST models is applied as a primary tool and

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39

Wang, Longfei, Songtao Wang, Xun Zhou, Fengbo Wen, and Zhongqi Wang. "Numerical Prediction of 45° Angled Ribs Effects on U-shaped Channels Heat Transfer and Flow under Multi Conditions." International Journal of Turbo & Jet-Engines 37, no. 1 (2020): 41–59. http://dx.doi.org/10.1515/tjj-2017-0008.

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AbstractRibs effects on the heat transfer performance and cooling air flow characteristics in various aspect ratios (AR) U-shaped channels under different working conditions are numerically investigated. The ribs angle and channel orientation are 45° and 90°, respectively, and the aspect ratios are 1:2, 1:1, 2:1. The inlet Reynolds number changes from 1e4 to 4e4 and rotational speeds include 0, 550 rpm, 1,100 rpm. Local heat transfer coefficient, endwall surface heat transfer coefficient ratio and augmentation factor are the three primary criteria to measure channel heat transfer. Ribs increas

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Maurer, Michael, Jens von Wolfersdorf, and Michael Gritsch. "An Experimental and Numerical Study of Heat Transfer and Pressure Loss in a Rectangular Channel With V-Shaped Ribs." Journal of Turbomachinery 129, no. 4 (2006): 800–808. http://dx.doi.org/10.1115/1.2720507.

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An experimental and numerical study was conducted to determine the thermal performance of V-shaped ribs in a rectangular channel with an aspect ratio of 2:1. Local heat transfer coefficients were measured using the steady state thermochromic liquid crystal technique. Periodic pressure losses were obtained with pressure taps along the smooth channel sidewall. Reynolds numbers from 95,000 to 500,000 were investigated with V-shaped ribs located on one side or on both sides of the test channel. The rib height-to-hydraulic diameter ratios (e∕Dh) were 0.0625 and 0.02, and the rib pitch-to-height rat

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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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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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Hsieh, Shou-Shing, and Hsiu-Cheng Liao. "Local Heat Transfer and Pressure Drop in a Rotating Two-Pass Ribbed Rectangular Channel." International Journal of Rotating Machinery 7, no. 3 (2001): 183–94. http://dx.doi.org/10.1155/s1023621x01000173.

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The influences of rotation and uneven heating condition as well as passage aspect ratio on the local heat transfer coefficient and pressure drop in a rotating, two pass ribroughened (rib heighte/DH≈0.27; rib pitchp/e=8) rectangular channel with a crosssection aspect ratio of 3 was studied for Reynolds numbers from 5000 to 25,000 and rotation numbers from 0 to 0.24. Regionally averaged Nusselt number variations along the duct have been determined over the trailing and leading surfaces for two pass straight channels and U-bend region. Implementing with the data from Hsieh and Liu (1996) forAR=1a

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Peng, Wei, Xiaokai Sun, Peixue Jiang, and Jie Wang. "Effect of ribbed and smooth coolant cross-flow channel on film cooling." Nuclear Engineering and Design 316 (May 2017): 186–97. http://dx.doi.org/10.1016/j.nucengdes.2017.03.015.

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Kang, Ho-Keun, and Soo-Whan Ahn. "Numerical Analysis of Heat Transfer in the Ribbed Channel Inserted with Tape." Journal of the Korean Society of Marine Engineering 34, no. 5 (2010): 638–44. http://dx.doi.org/10.5916/jkosme.2010.34.5.638.

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Wang, Wei, Yang Gao, Genwei Wang, and Haiping Tian. "Numerical investigation on cooling performance of pulsating flow in a ribbed channel." Journal of Mechanical Science and Technology 34, no. 4 (2020): 1765–74. http://dx.doi.org/10.1007/s12206-020-0338-6.

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Tzeng, Sheng-Chung, Wei-Ping Ma, K. David Huang, and Tai-Sheng Wu. "Flow Structure in an Inner Rotating Annular Channel with Ribbed Wall Cylinder." Japanese Journal of Applied Physics 44, no. 12 (2005): 8711–15. http://dx.doi.org/10.1143/jjap.44.8711.

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MIURA, Takahiro, Koji MATSUBARA, and Atsushi SAKURAI. "A Spatially Advancing Turbulent Flow and Heat Transfer in a Ribbed Channel." TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series B 78, no. 787 (2012): 607–17. http://dx.doi.org/10.1299/kikaib.78.607.

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Promvonge, Pongjet, Teerapat Chompookham, Sutapat Kwankaomeng, and Chinaruk Thianpong. "Enhanced heat transfer in a triangular ribbed channel with longitudinal vortex generators." Energy Conversion and Management 51, no. 6 (2010): 1242–49. http://dx.doi.org/10.1016/j.enconman.2009.12.035.

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TAKAHASHI, Toshihiko, and Kazunori WATANABE. "Cooling Performance of a Ribbed Channel in a Gas Turbine Rotor Blade." Proceedings of the Thermal Engineering Conference 2004 (2004): 275–76. http://dx.doi.org/10.1299/jsmeted.2004.275.

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SUGIYAMA, Hitoshi, Mitsunobu AKIYAMA, Ken YANAGISAWA, and Takayuki SATO. "Numerical Analysis of Three-Dimensional Turbulent Sructure in a Periodicaly-Ribbed Channel." Transactions of the Japan Society of Mechanical Engineers Series B 62, no. 597 (1996): 1733–40. http://dx.doi.org/10.1299/kikaib.62.1733.

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