...Geyu Zhong; Chuanyu Zhang; Xiaofeng Guo; Peng Yang; Yingwen Liu Driven by the periodical reverse of flow orientation, vortices in oscillatory flow induce a local high-speed and low-pressure flow region near the wall, which brings complex physical phenomena to viscous dissipation and heat transfer...

... motion of large Jovian vortices can be partially tested in future numerical experiments, but it will be difficult to prove. This is due to the fact that the computation of the heat transfer in the troposphere is intimately connected to the overall dynamics there that create and maintain the east–west...

...Yang Liu; Jing Cui; WeiZhong Li; Ning Zhang In this paper, forced convection heat transfer occurring in microchannels with different microstructures is investigated numerically. It is found that vortices will appear in the microstructure grooves. The influence of microchannel geometries on heat...

...—termed as the short channel. Multiple secondary flow patterns develop in the curved section of the channel, which in conjunction with the bulk axial flow, lead to the formation of multiple vortices and separation bubbles. The complex 3-D flow structures, as well as the variable c/s area of the curved...

... 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...

... deposition across the substrate. Free convection can negatively affect the gas flow as cold inlet gas impinges on the heated substrate, leading to vortices and disturbances in the normal flow path. This experimental research will be used to understand the buoyancy-induced and momentum driven flow structure...

... the exhaust heaters. This effect was due primarily to radiation from the exhaust heaters. Highest measured air temperature was about 300 ° C immediately above the right exhaust heater. The measured dominant flow structures are two larger counter rotating vortices over the top right side of the engine block...

...Jing He; Anthony M. Jacobi 28 04 2011 28 04 2011 boundary layers channel flow convection design engineering flow instability flow visualisation heat exchangers mixing vortices 2011 American Society of Mechanical Engineers ...

.... The results showed good agreement for both heat transfer magnitudes and spatial distributions, and the numerical results captured the predominate flow physics resulting from the 180 deg bend. The production of Dean vortices and acceleration of the flow in the bend produced strongly increased heat transfer...

... structures play a dominant role in the augmentation of heat transfer in the stagnation region. Calculation and examination of the transient physical properties for coherent structures (i.e., circulation, area averaged vorticity, integral length scale, and proximity to the surface) shows that freestream...

... regime and the flow is characterized by two fixed counter-rotating vortices downstream of the cylinder. Steady numerical computations, in the Reynolds number and blockage ratio ranges of Re d = 6 – 40 and β = 0 – 0.8 , were performed by Sen et al. ( 8 ), where their findings...

... 17 09 2010 17 09 2010 air argon cooling exergy flow measurement nitrogen nozzles orifices (mechanical) oxygen pipe flow thermal conductivity vortices vortex tube (RHVT) exergy cooling heating The vortex tube, also known as Ranque vortex tube, Hilsch vortex...

.... The governing equations for the mathematical model of the problem consist of vorticity transport equation, velocity Poisson equations, energy equation and solutal concentration equation. Numerical solution for the field variables are obtained by solving the governing equations using Galerkin’s weighted residual...

... research needs to be conducted under various flow conditions or configurations. chemically reacting flow combustion turbulent heat transfer flame holder channel flow channel flow chemically reactive flow combustion turbulence vortices 16 08 2009 02 02 2010 30 06...

... | M c | > 0 , there must be vorticity in the flow, i.e., a vortex, since this is the only way a fluid can carry momentum (in the absence of moving boundaries). The bulk measure of the destabilizing effect of gravity I E is plotted versus the maximum value of measure...

...Ram Ranjan; Jayathi Y. Murthy; Suresh V. Garimella convection evaporation heat pipes Laplace equations numerical analysis thin films two-phase flow vortices 11 06 2010 11 06 2010 2010 American Society of Mechanical Engineers ...

.... Interaction between neighboring vortices and plumes becomes more severe and highly unstable. This precludes the formation of steady two-dimensional longitudinal vortex rolls in the downstream and leads to an earlier and larger enhancement of the heat transfer than the case of the parallel-plate channel...

... in terms of the stream function and the vorticity vector. The effects of the Grashof number Gr, the Reynolds number Re, and the dimensionless time on the flow structure and heat transfer characteristics have been investigated in detail. Results have been obtained for the following parameters: 10 3 ≤ Gr...

... the cylinders, simulating a nozzle effect and enhancing heat transfer. At the space between the first and second and second and third cylinders, no shedding of the vortices is observed, but the flow pattern varies rapidly. Vortices are formed then disappears during the cycle. The shear layer is separated from...

... in nature, a new vortex generator (VG) array deployed in a “V” is proposed in the present work, aiming to create constructive interference between vortices. The array is composed of two delta-winglet pairs and placed at an attack angle of 10 deg or 30 deg. Its effectiveness is compared with a baseline...