... height (R B ) and Reynolds number (Re). We performed a parametric study and found that the large-scale vortices travelling along the channel walls between the neighboring baffles, which are generated by flow separation at the tips of the baffles and become unsteady due to a Hopf bifurcation from steady...

...Kun Yang; Kambiz Vafai The transient thermal response of a packed bed is investigated analytically. A local thermal nonequilibrium model is used to represent the energy transport within the porous medium. The heat flux bifurcation phenomenon in porous media is investigated for temporal conditions...

... in flow asymmetric regime and low wall heat fluxes below 500 W / m 2 to examine the Reynolds number and thermal effects on the flow and heat transfer of the bifurcated flow. General flow features and temperature distributions are presented. The transitional Reynolds numbers above, which a third...

.../S0022112071002970 Haselton , F. R. , and Scherer , P. W. , 1982 , “ Flow Visualization of Steady Streaming in Oscillatory Flow Though a Bifurcation Tube ,” J. Fluid Mech. 0022-1120 , 123 , pp. 315 – 333 . 10.1017/S0022112082003085 Simon , B. , Weinmann , G. , and Mitzner , W...

...Fujio Kuwahara; Yoshihiko Sano; Jianjun Liu; Akira Nakayama A porous media approach was proposed to investigate the characteristics of the bifurcating airflow and mass transfer within a lung. The theory of porous media was introduced in order to deal with a large number of bifurcations and a vast...

...Amador M. Guzmán; Raúl A. Hormazabal; Tania A. Aracena Heat transfer enhancement characteristics, through a transition scenario of flow bifurcations in symmetric wavy wall channels, are investigated by direct numerical simulations of the mass, momentum, and energy equations using spectral element...

...M. Thiruvengadam; B. F. Armaly; J. A. Drallmeier Simulations of three-dimensional laminar mixed convection in a vertical duct with plane symmetric sudden expansion are presented to illustrate the effects of the buoyancy-assisting force and the duct’s aspect ratio on flow bifurcation and heat...

... arrangement of variables is developed employing momentum interpolation for the pressure-velocity coupling. Global mode of cross-stream velocity oscillations predict the first bifurcation point increases linearly with blockage ratio with no second bifurcation found in the range of Re studied. The Strouhal...

... are constructed for the governing nonlinear boundary-value problem using a perturbation technique together with a special type of Hermite-Padé approximants and important properties of the temperature field including bifurcations and thermal criticality are discussed. 17 05 2005 28 01 2006...

...M. Z. Haq A spherically expanding flame in a quiescent premixture is a bifurcation phenomenon, in which the flame becomes unstable at a radius, greater than some critical value, while remaining stable below that critical radius. Beyond this critical radius, developing instabilities are initiated...

... m ˙ = mass flow rate, kg/s N = number of channels emanating from inlet plenum n = number of bifurcating channels per segment p = pressure, Pa Q = flow rate, L/s q ″ = heat flux, W/m 2 R = total radius of fractal-like heat sink...

... flow flow instability swirling flow jets shear flow flow separation bifurcation pipe flow Flow separation in internal flow and its subsequent reattachment, caused by sudden changes in geometry, occur in many engineering applications where heating or cooling is required...

...Rizos N. Krikkis; Stratis V. Sotirchos, Professor, Research Director,; Panagiotis Razelos, Mem. ASME, Professor Emeritus, A numerical bifurcation analysis is carried out in order to determine the solution structure of longitudinal fins subject to multi-boiling heat transfer mode. The thermal...

... to two-dimensional perturbations of the transverse roll type in a Hopf bifurcation for the vertical orientation of the fluid layer, whereas perturbations of the longitudinal roll type are most dangerous for a wide range of the value of the angle of inclination. In the case of the horizontal inclination...

..., loses stability at the critical point identified by the corresponding linear analysis to two-dimensional states in a Hopf bifurcation. These marginal points determine the linear stability curve that identifies the minimum Grashof number (based on the strength of the homogeneous heat source), at which...

... that the geometric plane of symmetry is also a plane of symmetry for the flow. This problem is re-examined over aspect ratios ranging from 0.2 to 1.0 and Grashof numbers from 10 3 to 10 5 . It is found that a pitchfork bifurcation occurs at a critical Grashof number for each of the aspect ratios considered, above...