Filters








676 Hits in 2.6 sec

Wrinkled flames and cellular patterns

Jeong-Mo Hong, Tamar Shinar, Ronald Fedkiw
2007 ACM Transactions on Graphics  
Figure 1: A dragon emits a flame, computed with the third order DSD equations coupled to the Navier-Stokes equations.  ...  , ONR N00014-02-1-0720, NSF ACI-0323866, NSF IIS-0326388 and NSF ITR-0121288.  ...  Acknowledgements Research supported in part by an ONR YIP award and a PECASE award (ONR N00014-01-1-0620), a Packard Foundation Fellowship, ONR N0014-06-1-0393, ONR N00014-05-1-0479 for a computing cluster  ... 
doi:10.1145/1239451.1239498 fatcat:43zatmnfl5amzj4gxdp2esdmmu

Wrinkled flames and cellular patterns

Jeong-Mo Hong, Tamar Shinar, Ronald Fedkiw
2007 ACM SIGGRAPH 2007 papers on - SIGGRAPH '07  
We show how to make use of the DSD framework in the context of computer graphics simulations of flames and fire to obtain interesting features such as flame wrinkling and cellular patterns.  ...  In particular, researchers in the field of detonation shock dynamics (DSD) have derived a set of equations which exhibit characteristic cellular patterns.  ...  , ONR N00014-02-1-0720, NSF ACI-0323866, NSF IIS-0326388 and NSF ITR-0121288.  ... 
doi:10.1145/1275808.1276436 fatcat:futzpdxi6nbzvk2pv75qeuvqsi

Wrinkled flames and cellular patterns

Jeong-Mo Hong, Tamar Shinar, Ronald Fedkiw
2007 ACM Transactions on Graphics  
Figure 1: A dragon emits a flame, computed with the third order DSD equations coupled to the Navier-Stokes equations.  ...  , ONR N00014-02-1-0720, NSF ACI-0323866, NSF IIS-0326388 and NSF ITR-0121288.  ...  Acknowledgements Research supported in part by an ONR YIP award and a PECASE award (ONR N00014-01-1-0620), a Packard Foundation Fellowship, ONR N0014-06-1-0393, ONR N00014-05-1-0479 for a computing cluster  ... 
doi:10.1145/1276377.1276436 fatcat:yxobri37arb77nvcf3fed3dweu

Intrinsic Flame Instabilities in Premixed and Nonpremixed Combustion

Moshe Matalon
2007 Annual Review of Fluid Mechanics  
It is responsible for the formation of sharp folds and creases in the flame front and for the wrinkling observed over the surface of expanding flames.  ...  In contrast, instabilities in diffusion flames, which give rise to cellular and oscillating flames, are mainly driven by diffusive-thermal effects, with thermal expansion playing a secondary role.  ...  A typical cellular pattern is shown in Figure 9 .  ... 
doi:10.1146/annurev.fluid.38.050304.092153 fatcat:zqmemk2jebccfhfzkt3jepz6ke

Heat release rate variations in high hydrogen content premixed syngas flames at elevated pressures: Effect of equivalence ratio

K.K.J. Ranga Dinesh, H. Shalaby, K.H. Luo, J.A. van Oijen, D. Thévenin
2017 International journal of hydrogen energy  
exhibiting similar cellular and wrinkling flames.  ...  The flame structures and the heat release rate were analysed and compared between fuel-lean, stoichiometric and fuel-rich centrally ignited spherical flames.  ...  exhibiting similar cellular and wrinkling flames.  ... 
doi:10.1016/j.ijhydene.2016.11.205 fatcat:zj7owssltneedc5qtlppxvnlh4

Interaction of turblence and chemistry in a low-swirl burner

J B Bell, R K Cheng, M S Day, V E Beckner, M J Lijewski
2008 Journal of Physics, Conference Series  
We focus on the differences in flame behavior for the two fuels, particularly on the hydrogen flame, which burns with a cellular structures.  ...  We consider two fuels, methane and hydrogen, each at two turbulent intensities. Here we examine some of the basic properties of the flow field and the flame structure.  ...  The cellular burning patterns additionally make the analysis of experimental data problematic and can lead to significant inaccuracies or misinterpretations.  ... 
doi:10.1088/1742-6596/125/1/012027 fatcat:dapmrpnmrfanxchvlserkgbfru

Turbulent Flame Speeds of G-equation Models in Unsteady Cellular Flows [article]

Yu-Yu Liu, Jack Xin, Yifeng Yu
2012 arXiv   pre-print
However, such frequency locking phenomenon disappears in viscous G-equation, and in the inviscid G-equation if time periodic oscillation of the cellular flow is replaced by time stochastic oscillation.  ...  We perform a computationl study of front speeds of G-equation models in time dependent cellular flows.  ...  time that the flame front cannot be really wrinkled, and so remains almost planar.  ... 
arXiv:1210.1671v1 fatcat:gonxry5i3ng3jc43unri6anagy

The cellular burning regime in type Ia supernova explosions

F. K. Röpke, W. Hillebrandt, J. C. Niemeyer
2004 Astronomy and Astrophysics  
The fundamental effects that dominate the flame evolution here are the Landau-Darrieus instability and its nonlinear stabilization, leading to a stabilization of the flame in a cellular shape.  ...  This is directly connected to the questions of active turbulent combustion (a mechanism of flame destabilization and subsequent self-turbulization) and a deflagration-to-detonation transition of the flame  ...  and Numerics for Conservation Laws" under contract HI 534/3.  ... 
doi:10.1051/0004-6361:20035721 fatcat:wv4qaxc3kvbqjjts5gg6se3a44

Turbulent Flame Speeds of G-equation Models in Unsteady Cellular Flows

Y-Y Liu, J. Xin, Y. Yu, Elaine Crooks, Fordyce Davidson, Bogdan Kazmierczak, Gregoire Nadin, Je-Chiang Tsai
2013 Mathematical Modelling of Natural Phenomena  
However, such frequency locking phenomenon disappears in viscous G-equation, and in the inviscid Gequation if time periodic oscillation of the cellular flow is replaced by time stochastic oscillation.  ...  We perform a computationl study of front speeds of G-equation models in time dependent cellular flows.  ...  When ω is larger, however, the direction of the flow changes so fast in time that the flame front cannot be really wrinkled, and so remains almost planar.  ... 
doi:10.1051/mmnp/20138312 fatcat:a64xkg7ar5chvbsaayhnbge4dq

Wrinkled flames and geometrical stretch

Bruno Denet, Guy Joulin
2011 Physical Review E  
Self-similar evolutions of unstable many-crested patterns are obtained. A link between stretch, nonlinearity, and instability with the cutoff size of the wrinkles in turbulent flames is suggested.  ...  Localized wrinkles of thin premixed flames subject to hydrodynamic instability and geometrical stretch of uniform intensity (S) are studied.  ...  Self-similar evolutions of unstable many-crest patterns are obtained. A link between stretch, nonlinearity and instability with the cut-off size of wrinkles in turbulent flames is suggested.  ... 
doi:10.1103/physreve.84.016315 pmid:21867312 fatcat:qa47nh7475eqvf7kqz3ifmnmuy

Rapid bladder cancer cell detection from clinical urine samples using an ultra-thin silicone membrane

Jennie H. Appel, Hao Ren, Mandy L. Y. Sin, Joseph C. Liao, Junseok Chae
2016 The Analyst  
A high-throughput strategy capable of differentiating bladder cancer cells from non-cancerous cells based on their respective cellular traction forces.  ...  assistance with cell culture, and Dr Kathy Mach for technical discussion.  ...  Acknowledgements We would like to thank Dr Julien Chen for HEK293f cell culture protocols, Dr Joshua Podlevsky for his invaluable technical discussion and reading of the manuscript, Jorge Jimenez for his  ... 
doi:10.1039/c5an01616a pmid:26549051 fatcat:z7aqdn7jgjdyjmzfkanovfrrw4

Microgravity experiments and numerical studies on ethanol/air spray flames

Romain Thimothée, Christian Chauveau, Fabien Halter, Colette Nicoli, Pierre Haldenwang, Bruno Denet
2017 Comptes rendus. Mecanique  
In terms of DL-pattern, it seems that such a disorder also plays a role in the design of the wrinkles.  ...  The same phenomenon of flame wrinkles and foldings is also observed in the numerical simulations, that permit to identify the front pattern exhibited numerically as of Darrieus-Landau (DL) type.  ... 
doi:10.1016/j.crme.2016.10.013 fatcat:6qj3ug3oa5c2ngcvuxhjzuxrnq

Page 485 of American Rocket Society. ARS Journal Vol. 26, Issue 6 [page]

1956 American Rocket Society. ARS Journal  
On the Flow Patterns of Flame S. I. PAI HERE are three different types of flame, (a) laminar flame, (b) turbulent flame in transition region, and (c) fully developed turbulent flame.  ...  length of the mean flow believe that the high values of I will give continuous com- hustion zones, and low values a “wrinkled” laminar flame.  ... 

On the Stability of Thermonuclear Burning Fronts in Type Ia Supernovae

F.K. Röpke, W. Hillebrandt
2005 International Astronomical Union Colloquium  
The cellular flame stabilization - which is a result of an interplay between the Landau-Darrieus instability and a nonlinear stabilization mechanism - is studied for the case of propagation into quiescent  ...  Our simulations indicate that in thermonuclear supernova explosions stable cellular flames develop around the Gibson scale and that a deflagration-to-detonation transition is unlikely to be triggered from  ...  In the second, nonlinear stage the flame stabilizes in a cellular pattern.  ... 
doi:10.1017/s0252921100009386 fatcat:rhiuzvbz5vhlblvtfkpdhn6xxq

Mechanical characterization of elastic membranes: Cell mechanics applications

Roberto Bernal, Chantal Tassius, Francisco Melo, Jean-Christophe Géminard
2007 Applied Physics Letters  
to measure the amplitude field of the wrinkled pattern produced, for instance, by the action of living cell.  ...  Wrinkled patterns produced by cells crawling onto elastic membranes provide a useful tool to test living cells' locomotion.  ...  FIG. 3: The wrinkle pattern results from the contraction of a single fibroblast which is moving freely on the elastic surface. Left panel; equal thickness fringe pattern modified by wrinkles.  ... 
doi:10.1063/1.2437672 fatcat:gct4ffy7obe6ve3gy2cqyi5lie
« Previous Showing results 1 — 15 out of 676 results