Zobrazeno 1 - 10
of 161
pro vyhledávání: '"Henrik Alfredsson"'
Publikováno v:
Journal of Fluid Science and Technology, Vol 18, Iss 1, Pp JFST0021-JFST0021 (2023)
The effect of polymer addition on transition to turbulence in a two-dimensional water-flow channel was experimentally investigated by flow visualization using reflective flakes. The flow entering the channel test section maintains a high disturbance
Externí odkaz:
https://doaj.org/article/8acad9cd5eb84849ba4521ce03676816
Publikováno v:
Journal of Fluid Science and Technology, Vol 18, Iss 1, Pp JFST0003-JFST0003 (2023)
It is now more than 100 years since the work of von Kármán (1921) on the boundary-layer flow over a rotating disk was published in the first volume of Zeitschrift für Angewandte Mathematik und Mechanik (ZAMM, Vol. 1(4), pp 233-252). Recently, ther
Externí odkaz:
https://doaj.org/article/f10dd44c978d4ce19b412da9c4246ea1
Publikováno v:
AIP Advances, Vol 8, Iss 7, Pp 075229-075229-19 (2018)
Control of a turbulent boundary layer separating on a half-cylinder mounted on a flat plate has been investigated using a Dielectric Barrier Discharge (DBD) plasma actuator placed along the apex of a cylinder. The main focus of the study has been to
Externí odkaz:
https://doaj.org/article/b1261b96ff7e4b7d8ba08bdce8af6415
Autor:
Takuya Kawata, P. Henrik Alfredsson
Publikováno v:
Journal of Fluid Mechanics. 879:255-295
In turbulent planar Couette flow under anticyclonic spanwise system rotation, large-scale roll-cell structures arise due to a Coriolis-force-induced instability. The structures are superimposed on smaller-scale turbulence, and with increasing angular
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a4be16cf9b068c9771d545f8a1eea732
https://doi.org/10.1017/jfm.2019.668
https://doi.org/10.1017/jfm.2019.668
Publikováno v:
Experiments in Fluids. 62
Abstract The present study experimentally determines the transitional Reynolds number range for plane channel flow and characterizes its transitional state. The pressure along the channel is measured to determine the skin friction coefficient as func
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ef3e6ac62a31aff0cae233991d656fb5
https://doi.org/10.1007/s00348-020-03102-6
https://doi.org/10.1007/s00348-020-03102-6
Publikováno v:
Springer Proceedings in Physics ISBN: 9783030807153
The diagnostic plot was introduced in 2010 (Eur. J. Mech. B/Fluids 29: 403–406) but was used already in 2008 during a large measurement campaign as a litmus test to determine if tripped zero-pressure gradient turbulent boundary layers fulfilled bas
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ac7772f54b5a520c1988b8969cbe2211
https://doi.org/10.1007/978-3-030-80716-0_17
https://doi.org/10.1007/978-3-030-80716-0_17
Publikováno v:
Springer Proceedings in Physics ISBN: 9783030807153
We analyse the azimuthal velocity fluctuation in the boundary layer driven by a rotating slender cone with a half-cone apex angle of \(30^{\circ }\). The flow is dominated by a centrifugal instability, which develops into randomly occurring spirallin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0fe72f51e4014564e949143d913dc3c2
https://doi.org/10.1007/978-3-030-80716-0_35
https://doi.org/10.1007/978-3-030-80716-0_35
Publikováno v:
Springer Proceedings in Physics ISBN: 9783030807153
The pressure gradient in a jet is usually regarded as negligibly small when deriving the streamwise velocity profile from the momentum equations. In addition one assumes that the bulk streamwise momentum is conserved in the streamwise direction. On t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fe764136802d44f6461c43a596e767f5
https://doi.org/10.1007/978-3-030-80716-0_6
https://doi.org/10.1007/978-3-030-80716-0_6
Publikováno v:
Sensors, Vol 16, Iss 3, p 344 (2016)
Pressure sensitive paint (PSP) was used to measure pressure on the blades of a radial compressor with a 51 mm inlet diameter rotating at speeds up to 50 krpm using the so called lifetime method. A diode laser with a scanning-mirror system was used to
Externí odkaz:
https://doaj.org/article/8f62b2a34f734fd7983b1fb0b2d03e17
Publikováno v:
Journal of Fluid Mechanics. 888
A planar jet issuing from a fully developed two-dimensional turbulent channel flow is studied, with a focus on the transverse flapping of the jet core. The streamwise and transverse velocities were measured with hot-wire anemometry using an X-type pr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0bbcc579a5e9bd2dc33d5b4a1e328558
https://doi.org/10.1017/jfm.2020.25
https://doi.org/10.1017/jfm.2020.25