Log in

Relevant bibliographies by topics / Wall blowing

Contents

Journal articles
Dissertations / Theses
Books
Book chapters
Conference papers

Academic literature on the topic 'Wall blowing'

Author: Grafiati

Published: 4 June 2021

Last updated: 17 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Wall blowing.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Wall blowing"

1

Abu-Nada, E., A. Al-Sarkhi, B. Akash, and I. Al-Hinti. "Heat Transfer and Fluid Flow Characteristics of Separated Flows Encountered in a Backward-Facing Step Under the Effect of Suction and Blowing." Journal of Heat Transfer 129, no. 11 (February 1, 2007): 1517–28. http://dx.doi.org/10.1115/1.2759973.

Full text

Abstract:

Abstract Numerical investigation of heat transfer and fluid flow over a backward-facing step (BFS), under the effect of suction and blowing, is presented. Here, suction/blowing is implemented on the bottom wall (adjacent to the step). The finite volume technique is used. The distribution of the modified coefficient of friction and Nusselt number at the top and bottom walls of the BFS are obtained. On the bottom wall, and inside the primary recirculation bubble, suction increases the modified coefficient of friction and blowing reduces it. However, after the point of reattachment, mass augmentation causes an increase in the modified coefficient of friction and mass reduction causes a decrease in modified coefficient of friction. On the top wall, suction decreases the modified coefficient of friction and blowing increases it. Local Nusselt number on the bottom wall is increased by suction and is decreased by blowing, and the contrary occurs on the top wall. The maximum local Nusselt number on the bottom wall coincides with the point of reattachment. High values of average Nusselt number on the bottom wall are identified at high Reynolds numbers and high suction bleed rates. However, the low values correspond to high blowing rates. The reattachment length and the length of the top secondary recirculation bubble are computed under the effect of suction and blowing. The reattachment length is increased by increasing blowing bleed rate and is decreased by increasing suction bleed rate. The spots of high Nusselt number, and low coefficient of friction, are identified by using contour maps.

APA, Harvard, Vancouver, ISO, and other styles

2

AMITAY, MICHAEL, and JACOB COHEN. "Instability of a two-dimensional plane wall jet subjected to blowing or suction." Journal of Fluid Mechanics 344 (August 10, 1997): 67–94. http://dx.doi.org/10.1017/s0022112097006071.

Full text

Abstract:

The effects of wall blowing or suction on the stability characteristics of a laminar incompressible two-dimensional plane wall jet are investigated both experimentally and theoretically. A quantitative comparison between linear stability calculations and phase-locked experimental data, obtained when the wall jet is subjected to two-dimensional excitations, confirms the co-existence of the viscous and inviscid instability modes and the theoretically predicted effects of blowing and suction on the stability of the wall jet. According to these predicted effects, blowing stabilizes the inviscid mode while destabilizing the viscous one; suction has the opposite effect. Furthermore, blowing and suction tend to increase and decrease, respectively, the ratio between the outer and inner amplitude maxima of the streamwise velocity fluctuation. When wall blowing is applied, the instability domain is enlarged and includes higher-frequency waves. In addition, the region where both unstable modes co-exist simultaneously begins at a lower local Reynolds number. Opposite effects are caused when suction is applied. The quantitative comparison between the theory and experiment includes the cross-stream structure and the downstream growth of the streamwise velocity fluctuations. In order to accurately account for the effect of the mean flow divergence in the stability analysis, the second-order corrections to the mean flow solutions are obtained for all wall conditions. Spectral distributions, obtained when natural wall-jets are subjected to blowing and suction, support qualitatively the above results.

APA, Harvard, Vancouver, ISO, and other styles

3

TARDU, SEDAT F. "Active control of near-wall turbulence by local oscillating blowing." Journal of Fluid Mechanics 439 (July 23, 2001): 217–53. http://dx.doi.org/10.1017/s0022112001004542.

Full text

Abstract:

The effect of time-periodical blowing through a spanwise slot on the near-wall turbulence characteristics is investigated. The blowing velocity changes in a cyclic manner from 0 to 5 wall units. The frequency of the oscillations is nearly equal to the median frequency of the near-wall turbulence. The measurements of the wall shear stress and the streamwise velocity are reported and discussed. The flow field near the blowing slot is partly relaminarized during the acceleration phase of the injection velocity which extends 40 wall units downstream. The imposed unsteadiness is confined to the buffer layer, and the time-mean structural parameters under unsteady blowing are found to be close to those of isotropic turbulence in this region. The relaminarized phase is unstable and gives way to a coherent spanwise structure that increases the shear from 80 to 300 wall units downstream of the slot in a predictable way. This phenomenon is strongly imposed-frequency dependent.

APA, Harvard, Vancouver, ISO, and other styles

4

Chung, Yongmann M., Hyung Jin Sung, and P. A. Krogstad. "Modulation of Near-Wall Turbulence Structure with Wall Blowing and Suction." AIAA Journal 40, no. 8 (August 2002): 1529–35. http://dx.doi.org/10.2514/2.1849.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Chung, Y. M., H. J. Sung, and P. A. Krogstad. "Modulation of near-wall turbulence structure with wall blowing and suction." AIAA Journal 40 (January 2002): 1529–35. http://dx.doi.org/10.2514/3.15227.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Doche, Olivier, and Sedat Tardu. "Mechanism of wall transfer under steady localized blowing." International Journal of Heat and Mass Transfer 55, no. 5-6 (February 2012): 1574–81. http://dx.doi.org/10.1016/j.ijheatmasstransfer.2011.11.013.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Marchisio, C. "Polystyrene shells from pellets containing a chemical blowing agent." Laser and Particle Beams 10, no. 3 (September 1992): 485–93. http://dx.doi.org/10.1017/s026303460000673x.

Full text

Abstract:

A new method for fabricating polystyrene ICF targets has been investigated. A solid solution of polystyrene (PS) containing a chemical blowing agent (CBA) is divided into small granules. These granules are blown into spherical shells in a vertical furnace. By varying the type and amount of CBA as well as furnace parameters, we have been able to produce PS shells 200–600 μm in diameter with wall thicknesses from 4–20 μm.

APA, Harvard, Vancouver, ISO, and other styles

8

Vlassov, D., J. V. C. Vargas, J. C. Ordonez, and L. S. Martins. "TURBULENT STRESS DISTRIBUTION IN THE TURBULENT BOUNDARY LAYER ON A PERMEABLE POROUS PLATE." Revista de Engenharia Térmica 5, no. 1 (July 31, 2006): 90. http://dx.doi.org/10.5380/reterm.v5i1.61678.

Full text

Abstract:

In this paper the results of experimental tests on turbulent boundary layer on a plate with air blowing through permeable porous wall are presented. Tests were performed in an aerodynamic tunnel varying the blowing rate within the range of 0 to 2.5% of the air flow velocity in the tunnel, using thermoanemometers of constant temperature. It has been determined that the blowing increases the boundary layer thickness and strongly transforms the boundary layer inner part and turbulent nucleus, while the outer part remains not deformed. An increase in blowing causes an abrupt viscous stress decrease, also decreasing skin friction. Thick boundary layers (up to 120 mm) allowed a profound analysis of Reynolds' turbulent stresses. It has been found a general distribution of turbulent stress in the turbulent layer which is independent of blowing velocity. It has been established for the turbulent characteristics that the determining coordinate is the relative horizontal velocity, not the distance from the wall. With a turbulent stress database obtained from turbulent stresses direct measurements, it has been proposed a flow model for boundary layer on a permeable porous plate. It has also been demonstrated that in high blowing conditions the horizontal velocity profile in the boundary layer becomes equal to the velocity profile in a plane jet.

APA, Harvard, Vancouver, ISO, and other styles

9

Goldstein, R. J., and L. D. Stone. "Row-of-Holes Film Cooling of Curved Walls at Low Injection Angles." Journal of Turbomachinery 119, no. 3 (July 1, 1997): 574–79. http://dx.doi.org/10.1115/1.2841160.

Full text

Abstract:

Film cooling effectiveness data are presented against a backdrop of ammonia-diazo flow visualizations for row-of-holes injection along a convex wall and a concave wall at angles of 15, 25, and 45 deg to the mainstream and at density ratios of approximately one and two. Injection angle effects vary with the rate of injection: At low blowing rates the injection angle is unimportant, at moderate blowing rates the shallower angles provide better effectiveness, and at high blowing rates a steeper injection angle sometimes provides better effectiveness. The condition of the local boundary layer, the severity of jet lift-off, and the strength of vortex interactions among the bound vortices of neighboring jets are key considerations in interpreting the data.

APA, Harvard, Vancouver, ISO, and other styles

10

Miró Miró, Fernando, Pieter Dehairs, Fabio Pinna, Maria Gkolia, Davide Masutti, Tamas Regert, and Olivier Chazot. "Effect of Wall Blowing on Hypersonic Boundary-Layer Transition." AIAA Journal 57, no. 4 (April 2019): 1567–78. http://dx.doi.org/10.2514/1.j057604.

Full text

APA, Harvard, Vancouver, ISO, and other styles

More sources

Dissertations / Theses on the topic "Wall blowing"

1

Donovan, Molly Hope. "Unsteady Effects of a Pulsed Blowing System on an Endwall Vortex." Wright State University / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=wright1559398697459176.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Avsarkisov, Victor [Verfasser], Martin [Akademischer Betreuer] Oberlack, and Suad [Akademischer Betreuer] Jakirlić. "Turbulent Poiseuille Flow with Uniform Wall Blowing and Suction. / Victor Avsarkisov. Betreuer: Martin Oberlack ; Suad Jakirlic." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2013. http://d-nb.info/1110792190/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Doner, William D. "Further studies of turbulence structure resulting from interactions between embedded vortices and wall jets at high blowing ratios." Thesis, Monterey, California. Naval Postgraduate School, 1989. http://hdl.handle.net/10945/27066.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Ferro, Marco. "Experimental study on turbulent boundary-layer flows with wall transpiration." Doctoral thesis, KTH, Mekanik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-217125.

Full text

Abstract:

Wall transpiration, in the form of wall-normal suction or blowing through a permeable wall, is a relatively simple and effective technique to control the behaviour of a boundary layer. For its potential applications for laminar-turbulent transition and separation delay (suction) or for turbulent drag reduction and thermal protection (blowing), wall transpiration has over the past decades been the topic of a significant amount of studies. However, as far as the turbulent regime is concerned, fundamental understanding of the phenomena occurring in the boundary layer in presence of wall transpiration is limited and considerable disagreements persist even on the description of basic quantities, such as the mean streamwise velocity, for the rather simplified case of flat-plate boundary-layer flows without pressure gradients. In order to provide new experimental data on suction and blowing boundary layers, an experimental apparatus was designed and brought into operation. The perforated region spans the whole 1.2 m of the test-section width and with its streamwise extent of 6.5 m is significantly longer than previous studies, allowing for a better investigation of the spatial development of the boundary layer. The quality of the experimental setup and measurement procedures was verified with extensive testing, including benchmarking against previous results on a canonical zero-pressure-gradient turbulent boundary layer (ZPG TBL) and on a laminar asymptotic suction boundary layer. The present experimental results on ZPG turbulent suction boundary layers show that it is possible to experimentally realize a turbulent asymptotic suction boundary layer (TASBL) where the boundary layer mean-velocity profile becomes independent of the streamwise location, so that the suction rate constitutes the only control parameter. TASBLs show a mean-velocity profile with a large logarithmic region and without the existence of a clear wake region. If outer scaling is adopted, using the free-stream velocity and the boundary layer thickness (δ99) as characteristic velocity and length scale respectively, the logarithmic region is described by a slope Ao=0.064 and an intercept Bo=0.994, independently from the suction rate (Γ). Relaminarization of an initially turbulent boundary layer is observed for Γ>3.70×10−3. Wall suction is responsible for a strong damping of the velocity fluctuations, with a decrease of the near-wall peak of the velocity-variance profile ranging from 50% to 65% when compared to a canonical ZPG TBL at comparable Reτ. This decrease in the turbulent activity appears to be explained by an increased stability of the near-wall streaks. Measurements on ZPG blowing boundary layers were conducted for blowing rates ranging between 0.1% and 0.37% of the free-stream velocity and cover the range of momentum thickness Reynolds number 10000<Reθ<36000. Wall-normal blowing strongly modifies the shape of the boundary-layer mean-velocity profile. As the blowing rate is increased, the clear logarithmic region characterizing the canonical ZPG TBLs gradually disappears. A good overlap among the mean velocity-defect profiles of the canonical ZPG TBLs and of the blowing boundary layers for all the Re number and blowing rates considered is obtained when normalization with the Zagarola-Smits velocity scale is adopted. Wall blowing enhances the intensity of the velocity fluctuations, especially in the outer region. At sufficiently high blowing rates and Reynolds number, the outer peak in the streamwise-velocity fluctuations surpasses in magnitude the near-wall peak, which eventually disappears.
Genom att använda sig av genomströmmande ytor, med sugning eller blåsning, kan man relativt enkelt och effektivt påverka ett gränsskikts tillstånd. Genom sin potential att påverka olika strömningsfysikaliska fenomen så som att senarelägga både avlösning och omslaget från laminär till turbulent strömning (genom sugning) eller som att exempelvis minska luftmotståndet i turbulenta gränsskikt och ge kyleffekt (genom blåsning), så har ett otaligt antal studier genomförts på området de senaste decennierna. Trots detta så är den grundläggande förståelsen bristfällig för de strömningsfenomen som inträffar i turbulenta gränsskikt över genomströmmande ytor. Det råder stora meningsskiljaktigheter om de mest elementära strömningskvantiteterna, såsom medelhastigheten, när sugning och blåsning tillämpas även i det mest förenklade gränsskiktsfallet nämligen det som utvecklar sig över en plan platta utan tryckgradient. För att ta fram nya experimentella data på gränsskikt med sugning och blåsning genom ytan så har vi designat en ny experimentell uppställning samt tagit den i bruk.Den genomströmmande ytan spänner över hela bredden av vindtunnelns mätsträcka (1.2 m) och är 6.5 m lång i strömningsriktningen och är därmed betydligt längre än vad som använts i tidigare studier. Detta gör det möjligt att bättre utforska gränsskiktet som utvecklas över ytan i strömningsriktningen. Kvaliteten på den experimentella uppställningen och valda mätprocedurerna har verifierats genom omfattande tester, som även inkluderar benchmarking mot tidigare resultat på turbulenta gränsskikt utan tryckgradient eller blåsning/sugning och på laminära asymptotiska sugningsgränsskikt. De experimentella resultaten på turbulenta gränsskikt med sugning bekräftar för första gången att det är möjligt att experimentellt sätta upp ett turbulent asymptotiskt sugningsgränsskikt där gränsskiktets medelhastighetsprofil blir oberoende av strömningsriktningen och där sugningshastigheten utgör den enda kontrollparametern. Det turbulenta asymptotiska sugningsgränsskiktet visar sig ha en medelhastighetsprofil normalt mot ytan med en lång logaritmisk region och utan förekomsten av en yttre vakregion. Om man använder yttre skalning av medelhastigheten, med friströmshastigheten och gränsskiktstjockleken som karaktäristisk hastighet respektive längdskala, så kan det logaritmiska området beskrivas med en lutning på Ao=0.064 och ett korsande värde med y-axeln på Bo=0.994, som är oberoende av sugningshastigheten. Om sugningshasigheten normaliserad med friströmshastigheten överskrider värdet 3.70x10^-3 så återgår det ursprungligen turbulenta gränsskiktet till att vara laminärt. Sugningen genom väggen dämpar hastighetsfluktuationerna i gränsskiktet med upp till 50-60% vid direkt jämförelse av det inre toppvärdet i ett turbulent gränsskikt utan sugning och vid jämförbart Reynolds tal. Denna minskning av turbulent aktivitet verkar härstamma från en ökad stabilitet av hastighetsstråken närmast ytan. Mätningar på turbulenta gränsskikt med blåsning har genomförts för blåsningshastigheter mellan 0.1 och 0.37% av friströmshastigheten och täcker Reynoldstalområdet (10-36)x10^3, med Reynolds tal baserat på rörelsemängds-tjockleken. Vid blåsning genom ytan får man en stark modifiering av formen på hastighetesfördelningen genom gränsskiktet. När blåsningshastigheten ökar så kommer till slut den logaritmiska regionen av medelhastigheten, karaktäristisk för turbulent gränsskikt utan blåsning, att gradvis försvinna. God överens-stämmelse av medelhastighetsprofiler mellan turbulenta gränsskikt med och utan blåsning erhålls för alla Reynoldstal och blåsningshastigheter när profilerna normaliseras med Zagarola-Smits hastighetsskala. Blåsning vid väggen ökar intensiteten av hastighetsfluktuationerna, speciellt i den yttre regionen av gränsskiktet. Vid riktigt höga blåsningshastigheter och Reynoldstal så kommer den yttre toppen av hastighetsfluktuationer i gränsskiktet att överskrida den inre toppen, som i sig gradvis försvinner.

QC 20171101

APA, Harvard, Vancouver, ISO, and other styles

5

Avsarkisov, Victor. "Turbulent Poiseuille Flow with Uniform Wall Blowing and Suction." Phd thesis, 2013. https://tuprints.ulb.tu-darmstadt.de/3931/1/Diss.pdf.

Full text

Abstract:

The objective of this thesis is the analysis of a fully developed, turbulent Poiseuille flow with wall transpiration, i.e. uniform blowing and suction on the lower and upper walls correspondingly. In the present study Lie group analysis of two-point correlation (TPC) equations and a set of Direct Numerical Simulations (DNS) of the three-dimensional, incompressible Navier-Stokes equations are used. The former is applied to find symmetry transformations and in turn to derive invariant solutions of the set of two- and multi-point correlation equations, while the latter is used to simulate turbulent channel flow with wall-transpiration at different Reynolds numbers and transpiration velocities. Both tools are used to find new mean velocity scaling laws. Consequently, it is shown that the transpiration velocity is a symmetry breaking, which implies a logarithmic scaling law in the core region of the channel. DNS validates the result of Lie symmetry analysis and, hence, aids establishing a new logarithmic law of deficit-type. The region of validity of the new logarithmic law is very different from the usual near-wall log-law and the slope constant in the core region differs from the von Karman constant and is equal to 0.3. Apart from the new log-law, extended forms of the linear viscous sublayer law and the near-wall log-law are derived. It is shown that these extended laws, as a particular case, include classical scaling laws obtained for the non-transpirating case. For the near-wall log-law it is found that transpiration only changes the additive constant (C) leaving the von Karman constant unaltered. The results present in the presented thesis indicate that high-Reynolds number and high-transpiration effects counterbalance in the near-wall region and amplify each other in the core region of the flow. It is found that at very high transpiration rates the flow tends to become laminar. Finally, structural analysis of the near-wall regions reveal that wall-blowing boosts generation of hairpin-type vortical structures and amplifies large scale motions (LSMs). Third and forth chapters of the present thesis are heavily based on the paper Avsarkisov, Oberlack & Hoyas (2014).

APA, Harvard, Vancouver, ISO, and other styles

6

Lin, Mu-Chen, and 林沐謙. "A Low Reynolds Number .kappa.-.epsilon. Turbulence Model with Wall Blowing or suction and Heat Transfer." Thesis, 1993. http://ndltd.ncl.edu.tw/handle/30229577722896249454.

Full text

Abstract:

博士
國立臺灣大學
機械工程研究所
81
This study proposes a low Reynolds number k-epsilon turbulent model which can be applied to flows with a wide range of blowing or suction.It is improved from the Lam-Bremhorst low Reynolds number turbulent model without blowing and suction.The model is tested in the flat-plate flow. The results show that not only the predicted velocity profile, shear stress distribution and drag coefficient(Cf),but also the turbulent viscosity are all in good agreement with available expermental data.An quantitative analysis of k and epsilon is also included in the present work. For thermal turbulent-boundary-layer with wall blowing in addition to the turbulent model proposed , this study also proposes a turbulent Prandtl number expression. It is a function of y+ and blowing parameter. Tested in the thermal turbulent-boundary-layer over a proposed turbulent model and turbulent Prandtl number expression can yield temperature distributions and St which are in good with experimental data.

APA, Harvard, Vancouver, ISO, and other styles

7

Ulerich, Rhys David. "Reducing turbulence- and transition-driven uncertainty in aerothermodynamic heating predictions for blunt-bodied reentry vehicles." Thesis, 2014. http://hdl.handle.net/2152/26886.

Full text

Abstract:

Turbulent boundary layers approximating those found on the NASA Orion Multi-Purpose Crew Vehicle (MPCV) thermal protection system during atmospheric reentry from the International Space Station have been studied by direct numerical simulation, with the ultimate goal of reducing aerothermodynamic heating prediction uncertainty. Simulations were performed using a new, well-verified, openly available Fourier/B-spline pseudospectral code called Suzerain equipped with a ``slow growth'' spatiotemporal homogenization approximation recently developed by Topalian et al. A first study aimed to reduce turbulence-driven heating prediction uncertainty by providing high-quality data suitable for calibrating Reynolds-averaged Navier--Stokes turbulence models to address the atypical boundary layer characteristics found in such reentry problems. The two data sets generated were Ma[approximate symbol] 0.9 and 1.15 homogenized boundary layers possessing Re[subscript theta, approximate symbol] 382 and 531, respectively. Edge-to-wall temperature ratios, T[subscript e]/T[subscript w], were close to 4.15 and wall blowing velocities, v[subscript w, superscript plus symbol]= v[subscript w]/u[subscript tau], were about 8 x 10-3 . The favorable pressure gradients had Pohlhausen parameters between 25 and 42. Skin frictions coefficients around 6 x10-3 and Nusselt numbers under 22 were observed. Near-wall vorticity fluctuations show qualitatively different profiles than observed by Spalart (J. Fluid Mech. 187 (1988)) or Guarini et al. (J. Fluid Mech. 414 (2000)). Small or negative displacement effects are evident. Uncertainty estimates and Favre-averaged equation budgets are provided. A second study aimed to reduce transition-driven uncertainty by determining where on the thermal protection system surface the boundary layer could sustain turbulence. Local boundary layer conditions were extracted from a laminar flow solution over the MPCV which included the bow shock, aerothermochemistry, heat shield surface curvature, and ablation. That information, as a function of leeward distance from the stagnation point, was approximated by Re[subscript theta], Ma[subscript e], [mathematical equation], v[subscript w, superscript plus sign], and T[subscript e]/T[subscript w] along with perfect gas assumptions. Homogenized turbulent boundary layers were initialized at those local conditions and evolved until either stationarity, implying the conditions could sustain turbulence, or relaminarization, implying the conditions could not. Fully turbulent fields relaminarized subject to conditions 4.134 m and 3.199 m leeward of the stagnation point. However, different initial conditions produced long-lived fluctuations at leeward position 2.299 m. Locations more than 1.389 m leeward of the stagnation point are predicted to sustain turbulence in this scenario.
text

APA, Harvard, Vancouver, ISO, and other styles

Books on the topic "Wall blowing"

1

Doner, William D. Further studies of turbulence structure resulting from interactions between embedded vortices and wall jets at high blowing ratios. Monterey, Calif: Naval Postgraduate School, 1989.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

2

Control of separated flow past a cylinder using tangential wall jet blowing. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1989.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

3

Noncompliant: A lone whistleblower exposes the giants of Wall Street. 2018.

Find full text

APA, Harvard, Vancouver, ISO, and other styles

4

Campbell, Ian. The Addis Ababa Massacre. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780190674724.001.0001.

Full text

Abstract:

On Friday 19th February 1937, following an abortive attack by a handful of insurgents on Mussolini's High Command in the Italian-occupied nation state of Ethiopia, 'repression squads' of armed Blackshirts and Fascist civilians were unleashed on the defenseless residents of the capital city Addis Ababa. In three terror-filled days and nights of arson, murder and looting, thousands of innocent and unsuspecting men, women and children were roasted alive, shot, bludgeoned, stabbed to death, or blown to pieces with hand-grenades. The incident is popularly known as Yekatit 12, the date concerned in the Ethiopian calendar. Meanwhile the notorious Viceroy Rodolfo Graziani, infamous for his atrocities in Libya, took the opportunity to add to the carnage by eliminating the intelligentsia and nobility of the ancient Ethiopian empire in a pogrom that swept across the land. In a richly illustrated and ground-breaking work backed up by meticulous and scholarly research, the author reconstructs and analyses one of Fascist Italy's least known atrocities, which he estimates eliminated 19-20 per cent of the capital's population. He exposes the hitherto little known cover-up conducted at the highest levels of the British government, which enabled the facts of one of the most hideous civilian massacres of all time to be concealed, and the perpetrators to walk free.

APA, Harvard, Vancouver, ISO, and other styles

Book chapters on the topic "Wall blowing"

1

Peter, Johannes M. F., and Markus J. Kloker. "Numerical Simulation of Film Cooling in Supersonic Flow." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 79–95. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_5.

Full text

Abstract:

Abstract High-order direct numerical simulations of film cooling by tangentially blowing cool helium at supersonic speeds into a hot turbulent boundary-layer flow of steam (gaseous H2O) at a free stream Mach number of 3.3 are presented. The stagnation temperature of the hot gas is much larger than that of the coolant flow, which is injected from a vertical slot of height s in a backward-facing step. The influence of the coolant mass flow rate is investigated by varying the blowing ratio F or the injection height s at kept cooling-gas temperature and Mach number. A variation of the coolant Mach number shows no significant influence. In the canonical baseline cases all walls are treated as adiabatic, and the investigation of a strongly cooled wall up to the blowing position, resembling regenerative wall cooling present in a rocket engine, shows a strong influence on the flow field. No significant influence of the lip thickness on the cooling performance is found. Cooling correlations are examined, and a cooling-effectiveness comparison between tangential and wall-normal blowing is performed.

APA, Harvard, Vancouver, ISO, and other styles

2

Tardu, S. "Near Wall Turbulence Reaction to a Localized Time-Periodical Blowing." In IUTAM Symposium on Mechanics of Passive and Active Flow Control, 311–16. Dordrecht: Springer Netherlands, 1999. http://dx.doi.org/10.1007/978-94-011-4199-4_50.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Cathalifaud, Patricia, and Paolo Luchini. "Optimal Control by Blowing and Suction at the Wall of Algebraically Growing Boundary Layer Disturbances." In Laminar-Turbulent Transition, 307–12. Berlin, Heidelberg: Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-662-03997-7_45.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Liu, Rong-hua, Yong-jun Li, Peng-fei Wang, Wei Shu, and Shang-xu Gou. "Influence of the Ratio of the Blowing and Sucking Flow on the Wall-Rotating Circulating Airflow in Fully Mechanized Excavation Face." In Proceedings of the 11th International Mine Ventilation Congress, 49–57. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-1420-9_5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

McFarland, Ben. "Predicting the Chemistry Inside a Cell." In A World From Dust. Oxford University Press, 2016. http://dx.doi.org/10.1093/oso/9780190275013.003.0006.

Full text

Abstract:

The process of scientific discovery is something like a walk near Freswick Castle. I assume you’ve never been there. (Neither have I, but a friend has.) Freswick Castle stands at the end of Scotland’s northeast end, at the mouth of the Burn of Freswick in the district of Caithness. As of this writing, it is unlisted in Google Maps, and I had to manually scan the coast to find it. Outside the castle is a simple, unlabeled structure that doubles as a biochemical parable. The castle itself is narrow and three stories tall, with orange shingles and gray stone, set on an arc of narrow beach between hills to the north and cliffs to the south. The building is approximately the cruciform shape of a shrunken cathedral, with the rightward wing moved to the top of the structure so it resembles a lowercase f. If you wander the grounds near Freswick Castle, you will discover a stone wall in the wind-blown waves of yellow- green grass, worn but still standing firm like Hadrian’s Wall. From above, it is a period preceding the castle’s f. Let’s approach this as a scientist, with measurement. From the castle side, this structure resembles the circular stump of a roofless tower, eight feet tall and twice that wide. The stones are ancient sand, compacted and weathered, stained different shades of red from iron deposited millions of years ago, but the mortar is new. But inspection is not enough—we should go in. Walk around to the other side, and an opening appears, as shown in Figure 2.1. The structure is not a closed circle, but it is a spiral wall open to the sea, and to you. Inside, a small stone bench invites you to sit. A window slit next to the bench is an eye to the outside. Surrounded by a jigsaw of rocks, you can hear the echo of waves all around and watch the blue-gray sky above. If the spiral’s opening is a mouth, then you are Jonah in the whale. You are both inside and outside at once.

APA, Harvard, Vancouver, ISO, and other styles

6

Yogerst, Chris. "Warner’s War." In Hollywood Hates Hitler!, 137–49. University Press of Mississippi, 2020. http://dx.doi.org/10.14325/mississippi/9781496829757.003.0012.

Full text

Abstract:

Harry Warner’s testimony was a well-crafted, thoughtful, and passionately delivered denunciation of the propaganda accusations. If any previous testimony showed cracks in the isolationists’ wall, Warner had just blown the barrier to bits. The isolationist senators tried to pick Warner apart but got nowhere. The senators went back and forth with Warner on the definition of war propaganda. Warner maintained his films were not propaganda, as they were all based on previously published accounts of actual events.

APA, Harvard, Vancouver, ISO, and other styles

7

McHughen, Alan. "Introducing Genetic Genealogy." In DNA Demystified, 187–207. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190092962.003.0008.

Full text

Abstract:

DNA is a great tool for genetic genealogy and family tree construction. If you were blown away by your surprising medical DNA results, tighten your belt and hold on to your genes! A primary reason people test their DNA is to discover genealogical connections. What does DNA say about racial or ethnic differences among peoples of the world? Are you really related to your weird Uncle Charlie? How can it help an adoptee find his or her biological parents? The next chapters explain how to use DNA to connect to other humans, to break through that “brick wall” of traditional genealogy, or simply to confirm or refute a genetic relationship. DNA genealogy tests also provide information on your ethnic makeup. For instance, it may confirm or refute that old family rumor about Great Grandpa marrying a Native American princess!

APA, Harvard, Vancouver, ISO, and other styles

8

Hutchinson, G. O. "Visual Art." In Motion in Classical Literature, 6–31. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780198855620.003.0002.

Full text

Abstract:

Visual art shows the ancient interest in motion palpably, and helps in perceiving both differences between depictions in art and literature and aspects they have in common. Mostly well-known works of art are chosen for detailed discussion. A Corinthian arbyallos shows leaping in a dance as an action admired in itself; a Boeotian skyphos gives a dynamic picture of Odysseus blown by the wind. The stele of Dexileos presents a moment of motion just before a decisive event, as does a wall-painting of Pentheus. Still further back before events come the discus-thrower (Discobolus) and a painting of Medea. A wall-painting of Hades and Persephone and Exekias’ vase-painting of Dionysus show gods in motion at the start and in the sequel of events. Artistic depictions exploit space, visual detail, and the regularity of motion; the viewer’s knowledge is important, as in literature. Lessing misguidedly thinks that literature is more suited to depicting motion; literature can do more with time, but less with physical detail and space. The contribution of the reader’s or listener’s imagination does not reduce the significance of described motion, any more than the contribution of the viewer reduces the significance of depicted thought. Part of literature’s interest in art is an interest in motion, as in ekphrasis or Pindar. Art and literature together show important variables (like speed), oppositions (as between individual and a group), structures (as of male and female). In literature, language is important to what motion arrests attention.

APA, Harvard, Vancouver, ISO, and other styles

9

Smits, A., D. Nicaise, F. de Barquin, K. Hariri, and J. Bosnjak. "Characterization and blowing application tests of a new geopolymer loose-fill material for the insulation of cavity walls." In Brick and Block Masonry, 937–46. CRC Press, 2016. http://dx.doi.org/10.1201/b21889-118.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Colopy, Cheryl. "Introduction." In Dirty, Sacred Rivers. Oxford University Press, 2012. http://dx.doi.org/10.1093/oso/9780199845019.003.0007.

Full text

Abstract:

Red, hand-painted letters in Devanagari script inscribed on a yellow background tell visitors, in Hindi, “This water is as pure as the water from Ganga. Please keep it clean.” The sign is painted on a wall near the entrance to a spring housed in a small temple in the Indian town of Almora. A shiva lingam painted red sits atop the tile roof that shelters a rectangular pool of clear water, embraced on three sides by white stucco walls below street level. Most of the people who come to this spring in the Himalayan foothills of eastern Uttarakhand obediently remove their shoes before descending the stairway to the stone pool. The spring, called a nola in this part of India, is several hundred years old, locals say. Until fairly recently all the water used in this area came from hundreds of springs; some are small ponds like this one, others are spouts or dhara from which water flows. Now many of the springs are contaminated by trash and sewage. New construction destroyed some of them or blocked the sources that fed them. The river that flows at the bottom of the valley below Almora does not have enough water both to support the region’s agriculture and to supply household water for the city of more than forty thousand, where many people are now accustomed to water piped into their homes. Besides, it’s expensive to pump water uphill into the town. Almora will soon have a full-blown water crisis. Already people go to the old springs that are still functioning. They need water because the supply in the city pipes sometimes dwindles; and many still prefer the taste and coldness of the spring water and believe it’s good for their health. The nola and dhara of Almora suggest some of the contradictions in South Asia’s growing water crisis. Traditional systems have been neglected or abandoned, even abused, in favor of the promised convenience of modern ones. But those twentieth-century replacements have sometimes turned out to be unreliable and have left many people unserved.

APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Wall blowing"

1

Okamura, Yushi, Hideaki Sugioka, and Yasuo Kawaguchi. "Enhancement of Turbulent Shear Stress and Mass Transfer in Wall Turbulence Accompanied With Wall Blowing." In ASME 2016 Fluids Engineering Division Summer Meeting collocated with the ASME 2016 Heat Transfer Summer Conference and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/fedsm2016-7746.

Full text

Abstract:

Spatial distribution of velocity and mass concentration fluctuation in turbulent channel flow with wall blowing were simultaneously measured by PIV/PLIF. The recorded pictures were analyzed to clarify the turbulent momentum and mass transfer from statistical view point and from spatial evolution of coherent eddy structure. Experimental result revealed that the Reynold shear stress and turbulent intensity are enhanced as the blowing rate increasing. On the other hand, structural parameters based on local turbulence such as turbulent Schmidt number and a degree of turbulent anisotropy is not affected by wall blowing. In comparison without wall blowing, we found that the turbulent eddy structure locates apart from the wall. Besides, energy spectrum and swirling strength is also enhanced by wall blowing. It is associated with increase of resistance by wall blowing. Generally in wall turbulence, fluctuation motions are restricted by the presence of solid wall. But for the blowing from the wall relaxes this restriction and Reynolds shear stress is enhanced, which leads to enhancement of turbulent mass flux. Moreover, from results of spatial distribution of instantaneous fields, wall-blowing helps development of hairpin vortexes. It is concluded that development of hairpins leads to enhancement of turbulent mass transfer.

APA, Harvard, Vancouver, ISO, and other styles

2

Na, Yang, and Changjin Lee. "Intrinsic Flow Oscillation in Channel Flow with Wall Blowing." In 44th AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2008. http://dx.doi.org/10.2514/6.2008-5019.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Na, Yang, and Changjin Lee. "LES Studies on the Channel Flow with Wall Blowing." In 43rd AIAA/ASME/SAE/ASEE Joint Propulsion Conference & Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-5357.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Lee, Changjin, Ja Ye Koo, and Tae-Seong Roh. "Response to Acoustic Perturbations in Channel Flow with Wall Blowing." In 47th AIAA Aerospace Sciences Meeting including The New Horizons Forum and Aerospace Exposition. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2009. http://dx.doi.org/10.2514/6.2009-806.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

Ghaffari, Shirin, Olaf Marxen, Gianluca Iaccarino, and Eric Shaqfeh. "Numerical Simulations of Hypersonic Boundary-Layer Instability with Wall Blowing." In 48th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-706.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Lee, Changjin, Khin Oo Mon, and Heeseok Koo. "Interaction of vortices due to diaphragm on the wall blowing surface." In 49th AIAA/ASME/SAE/ASEE Joint Propulsion Conference. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2013. http://dx.doi.org/10.2514/6.2013-3643.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Lee, Changjin, and Yang Na. "Non-linear Combustion and LES Analysis with Wall Blowing in Hybrid Rocket." In 40th International Conference on Environmental Systems. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2010. http://dx.doi.org/10.2514/6.2010-6956.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Ham, Young-Bog, Byung-Ju Lim, Jong-Ho Noh, and Jong-Ho Park. "Suction Force of Blowing Fans on Various Surface Shapes of Outer Wall." In 29th International Symposium on Automation and Robotics in Construction; Held jointly with the 8th World Conference of the International Society for Gerontechnology. International Association for Automation and Robotics in Construction (IAARC), 2012. http://dx.doi.org/10.22260/isarc2012/0059.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Na, Y., and C. Lee. "The characteristics of turbulent surface flow in planar channel with imposed wall blowing." In Progress in Propulsion Physics. Les Ulis, France: EDP Sciences, 2011. http://dx.doi.org/10.1051/eucass/201102389.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Sugioka, Hideaki, Zaiguo Fu, Takahiro Tsukahara, and Yasuo Kawaguchi. "PIV-PLIF Experiment on Modification of Turbulent Scalar Diffusion Near the Wall by Uniform Blowing." In ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ajkfluids2015-25431.

Full text

Abstract:

The transfer phenomena of wall turbulence are associated with the quasi ordered vortex structures, which are developed from small scale vortices near the wall. How to change the turbulent motion and turbulent transfer by modifying the condition of near wall is important for academic and industrial applications in the control of mass and heat transfers. In this study, we examined experimentally the effect on changing mass transfer in channel turbulence by uniform blowing from a porous wall. We used PIV/PLIF simultaneous measurement by mixing fluorescent dye into blown fluids to observe the spatial evolution of mass transfer in turbulence and analyzed flow fields from the view point of turbulence statistics. It was found that blowing enhanced fluctuation of disturbance and along with it, the coefficients of skin friction and mass transfer rate were increased. On the other hand, the isotropy of turbulence and turbulent Schmidt number were almost not changed. We concluded that there are universality in redistribution of turbulence energy and similar relationship between momentum and mass transfer.

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!