Zobrazeno 1 - 10
of 24
pro vyhledávání: '"W. G. Tiederman"'
Autor:
K. J. Harder, W. G. Tiederman
Publikováno v:
Philosophical Transactions of the Royal Society of London. Series A: Physical and Engineering Sciences. 336:19-34
A two-component laser velocimeter has been used to determine the effect of wall strain rate, polymer concentration and channel height upon the drag reduction and turbulent structure in fully developed, low concentration, two-dimensional channel flows
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::08ba5424acd590e78e8d8eb296ce8083
https://doi.org/10.1098/rsta.1991.0064
https://doi.org/10.1098/rsta.1991.0064
Autor:
R. E. Smith, W. G. Tiederman
Publikováno v:
Rheologica Acta. 30:103-113
One very effective method of reducing the drag of a turbulent fluid flow is through the use of soluble, viscoelastic, long-chain, high-molecular-weight polymer additives. These additives have produced drag reduction of up to 80% in pipe flows. Polyme
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::5f48026cce96c0f455e86ab148d707da
https://doi.org/10.1007/bf01134599
https://doi.org/10.1007/bf01134599
Autor:
David T. Walker, W. G. Tiederman
Publikováno v:
Journal of Fluid Mechanics. 218:377
Two-component laser velocimeter measurements in a fully developed turbulent water channel flow with polymer injection were used to examine the effect of polymer injection on the Reynolds stresses and the production terms in the Reynolds stress transp
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::3c339f9f78747c03b953df1c29b1c114
https://doi.org/10.1017/s0022112090001045
https://doi.org/10.1017/s0022112090001045
Autor:
W. G. Tiederman, D. T. Walker
Publikováno v:
Experiments in Fluids. 8:86-94
Instantaneous concentration profiles have been measured in turbulent water channel flows at 5 axial locations immediately downstream of a line, wall injection of a dyed 700 ppm polymer solution and for comparison, dyed water. Concentration was deduce
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d2532411ecd707f74419cc8fdc0c2a46
https://doi.org/10.1007/bf00203069
https://doi.org/10.1007/bf00203069
Autor:
W. G. Tiederman, T. S. Luchik
Publikováno v:
Journal of Fluid Mechanics. 174:529-552
Burst structures in the near wall region of turbulent flows are associated with a large portion of the turbulent momentum transport from the wall. However, quantitative measures of the timescales associated with the burst event are not well defined,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::50a3de2a5c7d51191df2d15920dc38c3
https://doi.org/10.1017/s0022112087000235
https://doi.org/10.1017/s0022112087000235
Publikováno v:
Journal of Biomechanical Engineering. 111:228-232
The influence of tilting disk valve orientation on pulsatile flow through a curved tube model of the human aorta was studied. Simultaneous, two-component laser Doppler velocimeter measurements were made in a tube having a 22 mm diameter and 41 mm rad
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::29cdfb31f00acb740fe984c35a1a345e
https://doi.org/10.1115/1.3168371
https://doi.org/10.1115/1.3168371
Autor:
M. M. Reischman, W. G. Tiederman
Publikováno v:
Journal of Fluid Mechanics. 70:369-392
The objective of this study was to make velocity measurements in drag-reducing flows which would be sufficient in scope and accuracy to test proposed models of drag-reducing flows and to yield new information about the mechanisms of drag reduction. C
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::8e42a5df23cd3f25e7d557c7c5f890e1
https://doi.org/10.1017/s002211207500208x
https://doi.org/10.1017/s002211207500208x
Autor:
W. G. Tiederman, T. S. Luchik
Publikováno v:
Journal of Fluid Mechanics. 190:241-263
A two-component laser-Doppler velocimeter was used to measure simultaneously velocity components parallel and normal to the wall in two fully developed, wellmixed, low-concentration (1-2 p.p.m.) drag-reducing channel flows and one turbulent channel f
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::af2b7f741ff9adbf2ba8682219918e7d
https://doi.org/10.1017/s0022112088001302
https://doi.org/10.1017/s0022112088001302
Autor:
D. G. Bogard, W. G. Tiederman
Publikováno v:
Journal of Fluid Mechanics. 179:1-19
Quantitative measurements of the structure of ejections from the wall region have been made using conditional-sampling techniques. Discrete ejections from a burst event were identified using fluorescent-dye flow visualization simultaneously with stre
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d6d2f6dc78fc2fdad9052abcf0d126a7
https://doi.org/10.1017/s002211208700140x
https://doi.org/10.1017/s002211208700140x
Autor:
M. M. Reischman, W. G. Tiederman
Publikováno v:
Journal of Fluids Engineering. 98:563-566
A calculation procedure for predicting mean velocity profiles in drag-reducing flows is presented. The procedure is based upon the eddy diffusivity model of Cess and it requires only pressure drop, flow rate and geometry information. The predictions
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::89fee5435082a798abd33f9f727fc1e5
https://doi.org/10.1115/1.3448397
https://doi.org/10.1115/1.3448397