Journal articles: 'Rough rotating-disk'

1

Miklavcic, M., and C. Y. Wang. "The flow due to a rough rotating disk." Zeitschrift f�r Angewandte Mathematik und Physik (ZAMP) 55, no. 2 (March 1, 2004): 235–46. http://dx.doi.org/10.1007/s00033-003-2096-6.

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2

Ma, F. "Flow of a thin film over a rough rotating disk." Probabilistic Engineering Mechanics 9, no. 1-2 (January 1994): 39–45. http://dx.doi.org/10.1016/0266-8920(94)90028-0.

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3

Zoueshtiagh, F., R. Ali, A. J. Colley, P. J. Thomas, and P. W. Carpenter. "Laminar-turbulent boundary-layer transition over a rough rotating disk." Physics of Fluids 15, no. 8 (August 2003): 2441–44. http://dx.doi.org/10.1063/1.1586916.

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4

Turkyilmazoglu, M. "The MHD boundary layer flow due to a rough rotating disk." ZAMM 90, no. 1 (January 13, 2010): 72–82. http://dx.doi.org/10.1002/zamm.200900259.

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5

Hwang, J. H., and F. Ma. "On the flow of a thin liquid film over a rough rotating disk." Journal of Applied Physics 66, no. 1 (July 1989): 388–94. http://dx.doi.org/10.1063/1.343889.

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6

Usman, Muhammad, Ahmer Mehmood, and Bernhard Weigand. "Heat transfer from a non-isothermal rotating rough disk subjected to forced flow." International Communications in Heat and Mass Transfer 110 (January 2020): 104395. http://dx.doi.org/10.1016/j.icheatmasstransfer.2019.104395.

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7

Hwang, J. H., and F. Ma. "On the depletion of a thin liquid film over a rough rotating disk." Mechanics Research Communications 17, no. 6 (November 1990): 423–28. http://dx.doi.org/10.1016/0093-6413(90)90061-g.

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8

Mustafa, M., Ammar Mushtaq, T. Hayat, and A. Alsaedi. "Modeling MHD swirling flow due to rough rotating disk with non-linear radiation and chemically reactive solute." International Journal of Numerical Methods for Heat & Fluid Flow 28, no. 10 (October 1, 2018): 2342–56. http://dx.doi.org/10.1108/hff-10-2017-0403.

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Purpose This study aims to deal with the laminar flow owing to rough rotating disk in the existence of vertical magnetic field and partial slip effects. The aim is to resolve heat transfer problem in the existence of non-linear radiative flux and thermal slip effects. The study also analyzes the mass transfer process when the flow field contains chemically reacting species. Design/methodology/approach Modified von-Kármán transformations are applied to change the conservation equations into similar forms. The transformed equations are treated by a convenient shooting method and by contemporary built in routine bvp4c of MATLAB. Findings The numerical solutions are used to address the role of main ingredients of the problem, namely, wall roughness, radiation and chemical reaction on the flow fields. Research limitations/implications Temperature profiles are considerably affected by a parameter measuring wall to ambient temperature ratio. Furthermore, behavior of concentration field is highly influenced by the reaction rate of the diffusing species. Originality/value The concept of non-linear radiation in chemically reactive flow over a rotating disk is just introduced here.

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9

Imayama, Shintaro, P. Henrik Alfredsson, and R. J. Lingwood. "Experimental study of rotating-disk boundary-layer flow with surface roughness." Journal of Fluid Mechanics 786 (November 24, 2015): 5–28. http://dx.doi.org/10.1017/jfm.2015.634.

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Rotating-disk boundary-layer flow is known to be locally absolutely unstable at $R>507$ as shown by Lingwood (J. Fluid Mech., vol. 299, 1995, pp. 17–33) and, for the clean-disk condition, experimental observations show that the onset of transition is highly reproducible at that Reynolds number. However, experiments also show convectively unstable stationary vortices due to cross-flow instability triggered by unavoidable surface roughness of the disk. We show that if the surface is sufficiently rough, laminar–turbulent transition can occur via a convectively unstable route ahead of the onset of absolute instability. In the present work we compare the laminar–turbulent transition processes with and without artificial surface roughnesses. The differences are clearly captured in the spectra of velocity time series. With the artificial surface roughness elements, the stationary-disturbance component is dominant in the spectra, whereas both stationary and travelling components are represented in spectra for the clean-disk condition. The wall-normal profile of the disturbance velocity for the travelling mode observed for a clean disk is in excellent agreement with the critical absolute instability eigenfunction from local theory; the wall-normal stationary-disturbance profile, by contrast, is distinct and the experimentally measured profile matches the stationary convective instability eigenfunction. The results from the clean-disk condition are compared with theoretical studies of global behaviours in spatially developing flow and found to be in good qualitative agreement. The details of stationary disturbances are also discussed and it is shown that the radial growth rate is in excellent agreement with linear stability theory. Finally, large stationary structures in the breakdown region are described.

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10

Chew, J. W., P. R. Farthing, J. M. Owen, and B. Stratford. "The Use of Fins to Reduce the Pressure Drop in a Rotating Cavity With a Radial Inflow." Journal of Turbomachinery 111, no. 3 (July 1, 1989): 349–56. http://dx.doi.org/10.1115/1.3262279.

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A combined theoretical and experimental study of radial inflow through a rotating cavity is reported. It is shown that radial fins attached to one of the disks are effective in reducing the pressure drop across the cavity. The mathematical model, is an extension of earlier plane-disk momentum-integral methods; the fins are treated as rectangular rib elements and a rough-disk model is derived. Numerical solutions of the integral equations are given. An approximate linear solution is also derived. Experiments were conducted when both disks were plane and when one of the disks was fitted with 60 radial fins. Flow visualization revealed the flow structure in the cavity and confirmed some of the assumptions used in the theoretical model. Measurements and predictions of the pressure drop across the cavity were in reasonable agreement.

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11

Ma, F., and J. H. Hwang. "Stochastic simulation of the flow of a thin liquid film over a rough rotating disk." Journal of Applied Physics 66, no. 10 (November 15, 1989): 5026–33. http://dx.doi.org/10.1063/1.343775.

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12

Turkyilmazoglu, M., and P. Senel. "Heat and mass transfer of the flow due to a rotating rough and porous disk." International Journal of Thermal Sciences 63 (January 2013): 146–58. http://dx.doi.org/10.1016/j.ijthermalsci.2012.07.013.

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13

Dandapat, B. S., S. Maity, and S. K. Singh. "Two-layer film flow on a rough rotating disk in the presence of air shear." Acta Mechanica 228, no. 11 (July 29, 2017): 4055–65. http://dx.doi.org/10.1007/s00707-017-1933-1.

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14

Le Palec, Georges. "Numerical study of convective heat transfer over a rotating rough disk with uniform wall temperature." International Communications in Heat and Mass Transfer 16, no. 1 (January 1989): 107–13. http://dx.doi.org/10.1016/0735-1933(89)90046-8.

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15

Usha, R., and B. Uma. "Flow of thin liquid film over a rough rotating disk in the presence of a transverse magnetic field." Zeitschrift für angewandte Mathematik und Physik 52, no. 5 (September 2001): 793–809. http://dx.doi.org/10.1007/pl00001574.

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16

Ma, F., and J. H. Hwang. "The effect of air shear on the flow of a thin liquid film over a rough rotating disk." Journal of Applied Physics 68, no. 3 (August 1990): 1265–71. http://dx.doi.org/10.1063/1.346727.

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17

Xu, Mian-le, Wei Chen, Ling-wen Liao, Zhen Wei, Jun Cai, and Yan-xia Chen. "Identifying diffusion limiting current to unravel the intrinsic kinetics of electrode reactions affected by mass transfer at rotating disk electrode." Chinese Journal of Chemical Physics 35, no. 5 (October 2022): 797–804. http://dx.doi.org/10.1063/1674-0068/cjcp2006085.

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Rotating disk electrode systems are widely used to study the kinetics of electrocatalytic reactions that may suffer from insufficient mass transfer of the reactants. Kinetic current density at certain overpotential calculated by the Koutecky-Levich equation is commonly used as the metrics to evaluate the activity of electrocatalysts. However, it is frequently found that the diffusion limiting current density is not correctly identified in the literatures. Instead of kinetic current density, the measured current density normalized by diffusion limiting current density ( j/ jL) has also been frequently under circumstance where its validity is not justified. By taking oxygen reduction reaction/hydrogen oxidation reaction/hydrogen evolution reaction as examples, we demonstrate that identifying the actual diffusion limiting current density for the same reaction under otherwise identical conditions from the experimental data is essential to accurately deduce kinetic current density. Our analysis reveals that j/ jL is a rough activity metric which can only be used to qualitatively compare the activity trend under conditions that the mass transfer conditions and the roughness factor of the electrode are exactly the same. In addition, if one wants to use j/ jL to compare the intrinsic activity, the concentration overpotential should be eliminated.

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18

Gao, Yungeng, Daniel A. Gulino, and Ryan Higgins. "Effects of Susceptor Geometry on Gan Growth on Si(111) with a New MOCVD Reactor." MRS Internet Journal of Nitride Semiconductor Research 4, S1 (1999): 316–21. http://dx.doi.org/10.1557/s1092578300002659.

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High quality GaN films on AlN buffer layers were grown on Si(111) with a new, commercial, two-injector vertical rotating disk MOCVD reactor (CVD, Inc.). It was found that the geometry of the susceptor greatly affected the structural quality of the epilayers on Si. For the original susceptor geometry, though single crystal GaN films could be obtained, the films were dark gray in appearance with a rough morphology, and the best x-ray rocking curve FWHM was 2.33°. After modifying the susceptor geometry, transparent, mirror-like single crystal GaN films were obtained with the best x-ray rocking curve FWHM being 0.24°. Photoluminescence (PL) and infrared reflectance (IR) spectra of the grown films were compared. The film growth rate was found to increase with decrease of the growth pressure. A 2-D simulation of the flow, heat transfer, and chemical species transport in the reactor showed a more symmetric flow, larger velocity gradient, and lower upward velocity with the modified susceptor, which may be the main reason for the improvement of the structural quality of the films.

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19

Shu, Frank H., Susana Lizano, and Fred C. Adams. "Star Formation in Molecular Cloud Cores." Symposium - International Astronomical Union 115 (1987): 417–34. http://dx.doi.org/10.1017/s0074180900096121.

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The problem of gravitational collapse and star formation is entirely different when the ratio of the mass of a molecular cloud Mcl to its magnetic flux Φ is high than when it is low. Magnetically-diluted overall collapse of a large dense core and the formation of an OB association or a bound cluster are the likely outcomes in the former case; quasi-static contraction of many small cores and their ultimate collapse to form a T association, in the latter. In our picture, the birth of a T association in a dark cloud like Taurus proceeds by ambipolar diffusion on a time-scale of ∼ 107 years. As magnetic and turbulent support is gradually lost from a small condensing core, it approaches a state resembling a slowly rotating singular isothermal sphere which, when it passes the brink of instability, collapses from “inside-out,” building up a central protostar and nebular disk. The emergent spectral energy distributions of theoretical models in this stage of protostellar evolution resemble closely those of recently found sources with steep spectra in the infrared. The protostellar phase is ended by the reversal of the infall by an intense stellar wind, whose ultimate source of energy derived from the differential rotation of the star. We argue that the initial breakout is likely to occur along the rotational poles, leading to collimated jets and bipolar outflows. The stellar jet eventually widens to sweep out gas in nearly all 4π steradian, revealing at the center a T Tauri star and a remnant nebular disk. We give rough scaling relations which must apply if an analogous process is to succeed for producing high mass stars.

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20

Koellisch-Mirbach, Andreas, Pawel Peter Bawol, Inhee Park, and Helmut Baltruschat. "(Keynote) Oxygen Reduction and Evolution in Ca²⁺ Containing DMSO on Atomically Smooth and Rough Pt and Au – Towards a Generalized ORR Mechanism in M²⁺ Containing DMSO." ECS Meeting Abstracts MA2022-01, no. 49 (July 7, 2022): 2063. http://dx.doi.org/10.1149/ma2022-01492063mtgabs.

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We demonstrate via cyclic voltammetry, differential electrochemical mass spectrometry (DEMS) and rotating ring disk electrode (RRDE) investigations with variation of the electrode surface roughness and atomically surface structure, that the CaO/CaO2 adsorbate layer formation determines the ORR product distribution. We found that on Pt electrodes peroxide is formed on the clean electrode, whereas superoxide is formed at the adsorbate covered electrode. We furthermore identified four key parameters, which strongly affect the ORR product distribution. The electrode oxide interaction: A strong interaction shifts the product distribution to larger superoxide contribution. The alkaline earth metal oxide interaction: A strong interaction shifts the product distribution to larger peroxide contribution. The electrode surface area: A large electrode surface area delays the completion of the adsorbate layer and increases the peroxide contribution. Electrode surface defects: Defects allow for faster nucleation and thus foster the adsorbate formation, which finally leads to a larger superoxide contribution. Finally, reviewing earlier results of our group we provide a more general mechanism for the oxygen reduction alkaline earth metal cation containing DMSO, for a variety of electrode materials. [1] A. Koellisch-Mirbach, I. Park, M. Hegemann, E. Thome and H. Baltruschat, ChemSusChem, (2021). [2] P.P. Bawol, A. Koellisch-Mirbach, C.J. Bondue, H. Baltruschat and P.H. Reinsberg, ChemSusChem, 14 (2021) 428.

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21

Zhao, Gai, Qi Hua Wang, Bai Xing Liu, and Ting Mei Wang. "UV or AO Irradiation Effects on the Tribological Properties of the Talc/GF/PI Composites." Key Engineering Materials 527 (November 2012): 197–204. http://dx.doi.org/10.4028/www.scientific.net/kem.527.197.

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The development of polyimide (PI) composites, particularly for use in aerospace and tribological applications, has gained importance over the past decades. However, there have been scarce studies on the ultraviolet (UV) or atomic oxygen (AO) irradiation characteristics of the polyimide composites, the understanding of which may aid in expanding its application in space environment. To study the irradiated effects of UV and AO on the tribological behaviour of the PI composites, glass fibers (GF)-reinforced PI composites filled with Talc were irradiated by UV or AO in a ground based simulation system. Glass fibers (GF) reinforced PI composites filled with talc were fabricated by means of a hot press molding technique. The volume contents of the talc (10, 20, 30 %) were chosen to study the effects of filler content on the tribological behavior of the composites, while the proportion of the glass fiber was kept at 15 vol %. To contrast the different effects of UV and AO irradiation on the tribological properties of the composites, experiments without irradiation and after UV or AO irradiation were conducted. The specimens of the composites were irradiated with UV for a period of 4h, while AO irradiation chosen for 6h. Dynamic mechanical analysis (DMA) and thermal gravimetric analysis (TGA) measurements were conducted. The friction and wear behaviors of the composites, rotating against GCr15 steel balls, were investigated on a ball-on-disk test rig. at room temperature and at a rotating speed of 0.1256 m/s and a load of 1N. Experimental results revealed that the composites exhibited high modulus and wear rate values with increasing talc content, but low coefficients of friction (COF). After AO irradiation, the COF of the composites increased, but UV irradiation had no obvious effect on the tribological property of the composites. Scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS) study of the composite surface showed that the chemical composition of the surface changed after UV irradiation because of the photooxidation and rough surface or even mountain-like structures were formed after AO erosion. The experiments indicated that the different space environments had an important effect on the tribological properties of the polymer composites. It is expected that this study may help expand the application of the polyimide composites in the field of space.

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22

Sheleg, V. K., M. A. Levantsevich, Y. V. Pilipchuk, and S. M. Nazarov. "Structure and Tribological Properties of Chromium Coatings Formed by Electrodeformation Cladding with Flexible Tools." Science & Technique 18, no. 5 (October 14, 2019): 359–68. http://dx.doi.org/10.21122/2227-1031-2019-18-5-359-368.

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The paper contains results of investigations on structure and tribotechnical properties of chromium coatings formed by a method of electrodeformation cladding with flexible tools (EDCFT). The purpose of these investigations is to assess prospects for application of the coatings as an alternative to galvanic chrome plating which is widely used in manufacturing hydraulic cylinder rods of metal-cutting machines. Rotary metal brushes with a wire pile made of 65Г-steel and 03Х17Н14М2-stainless steel have been used as a flexible tool. A compacted bar obtained by sintering a mixture of pure chromium powders and a nano-sized diamond-graphite blend UDDG has been employed as a donor material for EDCFT. According to results of the research it has been established that alloying elements of wire pile such as chromium and nickel are added to a coating composition while forming coatings a stainless steel brush. So in the case of using brushes with wire pile of 03X17H14M2-stainless steel the amount of chromium and nickel in a clad coating layer is 5.3 and 9.6 times higher in percentage, respectively, in comparison with the coating formed by a 65Г-steel brush that can contribute to improvement of coating corrosion resistance. At the same time, surface relief of the coating has a developed rough structure consisting of chromium microparticles having various size that are tightly packed and elongated in the direction of brush rotation and there are no flaws in the form of discontinuities and delaminations. Tribological tests have been performed under conditions of “boundary lubrication” on a rotary friction machine that implements friction of a rubber indenter on a flat surface of a rotating disk. According to data of the tribotechnical tests it has been ascertained that under conditions of “boundary friction” for such paired samples as “coated disc – rubber roller” chromium coatings formed by the EDCFT method, have the lowest values of a sliding friction coefficient (fтр = 0.023) which are 7.5 times lower than chromium coatings obtained by electroplating. At the same time the wear of rubber rollers in pairs with electroplated chromium coatings has turned out to be less than in pairs with the coating formed by the EDCFT method.

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23

Das, Abhijit, and Subrat Kumar Bhuyan. "Application of HAM to the von Kármán Swirling Flow with Heat Transfer Over a Rough Rotating Disk." International Journal of Applied and Computational Mathematics 4, no. 5 (August 12, 2018). http://dx.doi.org/10.1007/s40819-018-0544-4.

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24

Xie, Wenzhen, Chao Liu, Gancai Huang, and Dongxiang Jiang. "Numerical and Experimental Study on Rod-Fastened Rotor Dynamics Using Semi-Analytical Elastic-Plastic Model." Journal of Engineering for Gas Turbines and Power 144, no. 6 (March 11, 2022). http://dx.doi.org/10.1115/1.4053780.

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Abstract Rod-fastened rotor is the core rotating section of the heavy-duty gas turbine. To accurately analyze its dynamic characteristics, the contact model for the disk contact interface needs to be defined and established. Traditional statistical contact models, including the elastic model and elastoplastic model, cannot describe microscopic atomic behavior during the contact process of asperities, while the microscopic contact behavior of the asperities is one of the main factors in affecting the contact stiffness of the rough surface. In this work, the molecular dynamics simulation of the microscopic contact behavior of the rough surface is carried out and the semi-analytical model is built upon that. The semi-analytical model is later combined with the Timoshenko beam element in modeling the rotor system. The influence of plasticity index and surface roughness on the contact model and dynamic characteristics of the rotor is analyzed. Moreover, the experimental tests of natural frequencies and mode shapes are carried out. The results show that the proposed semi-analytical contact model is effective and more accurate compared to other elastic and elastic-plastic contact models.

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25

Lv, Yu-Pei, Hina Gul, Muhammad Ramzan, Jae Dong Chung, and Muhammad Bilal. "Bioconvective Reiner–Rivlin nanofluid flow over a rotating disk with Cattaneo–Christov flow heat flux and entropy generation analysis." Scientific Reports 11, no. 1 (August 4, 2021). http://dx.doi.org/10.1038/s41598-021-95448-y.

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AbstractThe non-Newtonian fluids possess captivating heat transfer applications in comparison to the Newtonian fluids. Here, a new type of non-Newtonian fluid named Reiner–Rivlin nanofluid flow over a rough rotating disk with Cattaneo–Christov (C–C) heat flux is studied in a permeable media. The stability of the nanoparticles is augmented by adding the gyrotactic microorganisms in the nanofluid. The concept of the envisaged model is improved by considering the influences of Arrhenius activation energy, chemical reaction, slip, and convective conditions at the boundary of the surface. The entropy generation is evaluated by employing the second law of thermodynamics. The succor of the Shooting scheme combined with the bvp4c MATLAB software is adapted for the solution of extremely nonlinear system of equations. The noteworthy impacts of the evolving parameters versus engaged fields are inspected through graphical illustrations. The outcomes show that for a strong material parameter of Reiner–Rivlin, temperature, and concentration profiles are enhanced. The behavior of Skin friction coefficients, local Nusselt number, Sherwood number, and local density number of motile microorganisms against the different estimates of emerging parameters are represented in tabular form. The authenticity of the intended model is tested by comparing the presented results in limiting form to an already published paper. A proper correlation between the two results is attained.

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26

Pei, Yunxian, Xuelan Zhang, Liancun Zheng, and Xinzi Wang. "Coupled flow and heat transfer of power-law Nanofluids on a non-isothermal rough rotary disk subject to magnetic field." Chinese Physics B, December 29, 2021. http://dx.doi.org/10.1088/1674-1056/ac46bd.

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Abstract In this paper, we study coupled flow and heat transfer of power-law nanofluids on a non-isothermal rough rotating disk subject to a magnetic field. The problem is formulated in terms of specified curvilinear orthogonal coordinate system. An improved BVP4C algorithm is proposed and numerical solutions are obtained. The influence of volume fraction, types and shapes of nanoparticles, magnetic field and power-law index on the flow and heat transfer behavior are discussed.<br/>Results show that the power-law exponents (PLE), nanoparticle volume fraction (NVF) and magnetic field inclination angle (MFIA) are almost no effects on velocities in wave surface direction, but have small or significant effects on azimuth direction. NVF have remarkable influence on local Nusselt number (LNN) and friction coefficients (FC) in radial and azimuth directions (AD). LNN increases with NVF while FC in AD decrease. The types of nanoparticles, magnetic field strength and inclination have small effects on LNN, but they have remarkable effects on the friction coefficients with positively correlated while the inclination is negatively correlated with heat transfer rate. The size of the nanoparticle shape factor is positively correlated with LNN.

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27

Gao, Yungeng, Daniel A. Gulino, and Ryan Higgins. "Effects of Susceptor Geometry on GaN Growth on SI(111) with a New Mocvd Reactor." MRS Proceedings 537 (1998). http://dx.doi.org/10.1557/proc-537-g3.53.

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AbstractHigh quality GaN films on AIN buffer layers were grown on Si(111) with a new, commercial, two-injector vertical rotating disk MOCVD reactor (CVD, Inc.). It was found that the geometry of the susceptor greatly affected the structural quality of the epilayers on Si. For the original susceptor geometry, though single crystal GaN films could be obtained, the films were dark gray in appearance with a rough morphology, and the best x-ray rocking curve FWHM was 2.33°. After modifying the susceptor geometry, transparent, mirror-like single crystal GaN films were obtained with the best x-ray rocking curve FWHM being 0.24°. Photoluminescence (PL) and infrared reflectance (IR) spectra of the grown films were compared. The film growth rate was found to increase with decrease of the growth pressure. A 2-D simulation of the flow, heat transfer, and chemical species transport in the reactor showed a more symmetric flow, larger velocity gradient, and lower upward velocity with the modified susceptor, which may be the main reason for the improvement of the structural quality of the films.

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Journal articles on the topic 'Rough rotating-disk'

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