A Gallery of Fluid Motion by M. Samimy, K. S. Breuer, L. G. Leal, P. H. Steen

By M. Samimy, K. S. Breuer, L. G. Leal, P. H. Steen

The visualization of fluid circulation has performed an immense function within the improvement of fluid dynamics and its functions, from the evolution of flight to monitoring climate, and realizing the stream of blood. The Fluid Dynamics department of the yankee actual Society sponsors an annual pageant for extraordinary pictures of fluid movement. This quantity contains a number of winners from 1985 to the current. every one snapshot is followed by means of a few explanatory textual content, making the amount an incredible acquisition for an individual keen on fluid stream study.

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Photographs in Figs. 1 and 2 are taken at 5 sec intervals. The Bond numbers for the experiments are large, Ꮾϭ⌬␳ga2/␴ഠ50, and the Reynolds numbers are small ᏾ ϭ ␳Ua/␮ഠ10Ϫ3. The Bond number represents the ratio of buoyancy forces to interfacial tension forces. Here, ␴ is interfacial tension, g is gravitational acceleration, a is the radius of the larger bubble, ⌬␳ is the density defect, ␮ is the fluid viscosity, and U the bubble rise speed. Since streamlines in front of a rising bubble diverge, the leading bubble is flattened (oblate distortion); conversely, the trailing bubble is extended (prolate distortion) due to the convergence of streamlines produced by the leading bubble [see Fig.

Owen, “Reduction of bluff body drag and sup- pression of vortex shedding by the introduction of wavy separation lines,” J. Fluids Struct. 12, 123 (1998). A Gallery of Fluid Motion, ed. M. Samimy et al. Published by Cambridge University Press. © Cambridge University Press, 2003. 24 A Gallery of Fluid Motion Figure 1(a) Figure 1b) Figure 1(c) Figure 1(d) Colliding dipolar vortices in a stratified fluid G. J. F. van Heijst and J. B. Flór University of Utrecht, The Netherlands The photographs illustrate experiments that have been performed on the collapse of a three-dimensional turbulent patch in a linearly stratified fluid.

1 V. O. , Phys. Fluids 10, 390 (1998). 2 J. M. , J. Fluid Mech. 372, 213 (1998). A Gallery of Fluid Motion, ed. M. Samimy et al. Published by Cambridge University Press. © Cambridge University Press, 2003. 007. 06. 15. 19. Hexagons and spirals in nonBoussinesq convection Eberhard Bodenschatz Stephen W. Morris Cornell University University of Toronto John R. de Bruyn Memorial University of Newfoundland Figure 1 shows the hexagonal flow pattern at onset. The picture is color coded to emphasize the warm upflow (light blue) and the cold downflow (orange) regions.

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