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Добірка наукової літератури з теми "Rough rotating-disk"

Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 29 січня 2023

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Статті в журналах з теми "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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Анотація:
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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Анотація:
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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Анотація:
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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Дисертації з теми "Rough rotating-disk"

1

Harris, Joseph H. "Stability of the flow over a rough, rotating disk." Thesis, University of Warwick, 2013. http://wrap.warwick.ac.uk/60307/.

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Анотація:
This thesis is concerned with discovering the effect of a distributed roughness on the boundary-layer stability of a rotating disk. The investigation uses both a local, linear stability analysis and machined aluminium disks rotating in water in conjunction with a hot-film anemometer system. The stability analysis applies a sinusoidal function to the surface of the disk which mimics anisotropic roughness similar to a grooved record. The new surface is used with the governing equations in order to calculate the new mean flow profiles for the now grooved surface at a variety of roughnesses. These new flow profiles are then used in the stability analysis. The results show that the roughness has the effect of increasing the stability of the cross-flow instability mechanism by decreasing the velocity of the radial wall jet. Conversely, increasing roughness levels cause the growth of the streamlinecurvature instability mechanism, something which is probably caused by a thickening of the boundary-layer seen in the velocity profiles. These two outcomes result in a predicted switch of the dominant instability mechanism on the disk. The experimental arrangement confirms the results of the mean velocity profiles, and appears to show the appearance of the enlarged streamline-curvature instability at higher roughness levels. This instability appears as a small burst of frequencies at low Reynolds numbers centred on the numerically predicted neutral curve lobe. This burst dies down as it moves downstream, but appears to increase the amount of energy in the flow which hastens the onset of the cross-flow instability earlier than predicted. Before the emergence of this other mode at lower roughness levels, the roughness appears to delay the onset of the spiral vortices by pushing back the location of the initial cross-flow instability. The experimental results also see a decrease in the number of spiral vortices seen around the circumference of the disk as roughness is increased. This result is thought to be due to the decrease in the growth rate of the cross-flow instability rather than any switch in the neutral curve positions.
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Частини книг з теми "Rough rotating-disk"

1

Ma, F. "Flow of a Thin Liquid Film over a Rough Rotating Disk." In Nonlinear Stochastic Mechanics, 367–78. Berlin, Heidelberg: Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-84789-9_32.

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Тези доповідей конференцій з теми "Rough rotating-disk"

1

Heydari, Ali, Ramin Miryan, and Saeid Sharifi. "Boundary Layers on a Rotating Rough Disk." In ASME 1994 International Computers in Engineering Conference and Exhibition and the ASME 1994 8th Annual Database Symposium collocated with the ASME 1994 Design Technical Conferences. American Society of Mechanical Engineers, 1994. http://dx.doi.org/10.1115/cie1994-0470.

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Анотація:
Abstract In this paper the turbulent fluid flow over a rotating disk with roughness is considered. The disk is assumed to be at uniform wall temperature. The surface roughness is assumed to influence the turbulent boundary layer by adding a roughness parameter height k. Boundary-layer approximation reduces the elliptic Navier-Stockes equations to parabolic equations, where the Keller-Cebeci method of finite-difference solution is used to solve the resulting system of partial-differential equations. The resulting curve-fit equations to the numerically calculated results for three regions of laminar, transition and turbulent flow is shown to be consistent to those obtained for flow over a flat plate or inside a circular cylinder. Calculations for various surface roughness parameters are made and results are presented.
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2

Lee, J. H., M. H. Lee, and G. H. Jang. "Effect of an Hourglass-Shape Tapered Sleeve on the Performance of the Fluid Dynamic Bearings of a HDD Spindle Motor." In ASME 2013 Conference on Information Storage and Processing Systems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/isps2013-2870.

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Анотація:
Fluid dynamic bearings (FDBs) of a HDD spindle motor support the rotating disk-spindle system through the pressure generated in the fluid lubricant. The radial and axial clearances of a 2.5″ HDD spindle motor are approximately 2 and 30 micro-meters, respectively, and herringbone or spiral grooves are inscribed in the sleeve of journal or thrust bearings to provide pumping pressure. One of the difficult manufacturing processes is to inscribe uniform grooves, especially groove depth in the range of several micro meters. Grooves are inscribed on the surface of the stainless steel sleeve by the electro chemical machining (ECM) which generally generates rough surface of the sleeve in grooved bearing. Ball-sizing process is used to scrape down rough surface. When a ball passes through the sleeve of FDBs to make rough surface smooth, compressive pressure is generated between ball and sleeve inlet and between ball and sleeve outlet, respectively. It forms an hourglass-shape tapered sleeve as shown in Figure 1, and tapered sleeve generally decreases the static and dynamic performance of the FDBs and the HDD spindle system, consequently.
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3

Adair, David, Michael Kirka, and Daniel Ryan. "Additive Manufacture of Prototype Turbine Blades for Hot-Fired Engine Performance Validation Trials." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90966.

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Анотація:
Abstract Additive manufacturing (AM), also known as 3D printing, is a rapidly developing technology with tremendous potential in both developmental and production applications. Solar Turbines Incorporated is committed to AM technology for gas turbine applications. The ability to metal 3D print novel designs of turbine blades capable of actual turbine engine operation would effectively reduce design validation cycle time, and allow acquisition of key performance data early in a design campaign. In support of Solar’s advanced manufacturing development and ongoing engine efficiency improvement goals, Solar initiated a project to print a full set of Mercury™ 50 stage 2 turbine blades to be run in a development engine. Solar leveraged years of experience with design and serial production of AM components in support of this project. A significant challenge faced when printing turbine blades is producing metal with mechanical properties sufficient to withstand the rigors of engine operation. As a rotating component within the hot section of the engine, turbine blades experience high centrifugal and pressure loads at elevated temperatures. After investigation of possible alloys capable of meeting the requirements of the Mercury™ 50 design envelope, the gamma prime (γ’) strengthened nickel superalloy Inconel™ 738LC was selected to provide the best opportunity for successful development engine testing. Solar partnered with Oak Ridge National Laboratory (ORNL) to produce the Inconel™ 738LC blades with Electron Beam Melting (EBM) powder bed fusion process. Once a rough blade shape was printed, the fir-tree attachment, blade tip shroud, and air flow path surfaces were finished using both conventional and non-conventional machining processes. In-process monitoring, metallurgical evaluations, mechanical testing, and non-destructive inspection techniques were used to validate the printed blade material integrity and conformance to geometric design intent. Planned future activities include assembly of the AM blades onto a disk for spin pit testing to validate the mechanical integrity and design margin of the blades. The final phase of the project will be to install the bladed disk assembly into a Mercury™ 50 engine at Solar Turbines to conduct a series of hot-fired engine performance tests.
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