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Author: nicos martys

Displaying records 41 to 50 of 75 records.
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41. Breakup of a Fluid Thread in a Confined Geometry: Droplet-Plug Transition, Perturbation Sensitivity and Kinetic Stabilization with Confinement
Published: 1/1/2004
Authors: John G Hagedorn, Nicos Martys, Jack F Douglas
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853936

42. Suppression of Capillary Instability of a Polymeric Thread Via Parallel Plate Confinement
Published: 7/1/2003
Authors: Y Son, Nicos Martys, John G Hagedorn, Kalman D Migler
Abstract: We investigate the stability of a polymer thread imbedded in a matrix that is confined between two parallel plates. Utilizing a combination of experiments, numerical simulations (Lattice-Boltzmann) and surface area calculations we find substantial d ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852167

43. Relating Fresh Concrete Viscosity Measurements From Different Rheometers
Series: Journal of Research (NIST JRES)
Published: 5/1/2003
Authors: Chiara F Ferraris, Nicos Martys
Abstract: The rheological properties of concrete need to be measured and predicted to enable the characterization of special concrete such as self-consolidating concrete (SCC). It was also shown by a round-robin held in 2000 [ , ] that different rheometers g ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860454

44. Simulation of Droplet Breakup Using a Lattice Boltzmann Method
Published: 5/1/2003
Authors: Frederick R Phelan Jr, Nicos Martys
Abstract: Droplet breakup in homogeneous shear flow at super critical Capillary numbers and a viscosity ratio of unity is studied using a lattice Boltzmann method. We find that the total number of child drops that form from an isolated super critical drop scal ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852170

45. Multiscaling Modeling of Fluid Transport in Heterogeneous Materials Using Discrete Boltzmann Methods
Published: 12/1/2002
Authors: Nicos Martys, John G Hagedorn
Abstract: The lattice Boltzmann method is a promising approach for modeling single and multicomponent fluid flow in complex geometries like porous materials. Here, we review some of our previous work and discuss some recent developments concerning fluid flow ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860460

46. Simulation of SCC Flow
Published: 11/1/2002
Authors: Nicos Martys, Chiara F Ferraris
Abstract: Predicting the rheological properties of concrete is essential for its optimal use in situations such as flow between rebars. The aggregate gradation and shape, as well as the rheological properties of the mortar or cement paste will affect the flow ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860456

47. Research and Challenges of Multi-Scale Mechanics and Modeling
Published: 10/1/2002
Authors: K P Chong, Nicos Martys
Abstract: One of the great challenges in the material sciences is to predict long term performance of materials and structures. Recent efforts have focused on linking nano/micro scalebehavior to meso-scale and macroscale behavior through computational modeli ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860419

48. Fresh Concrete Rheology - Recent Developments
Published: 12/1/2001
Authors: Chiara F Ferraris, F De Larrard, Nicos Martys
Abstract: The design of concrete with specified properties for an application is not a new science, but it has taken on a new meaning with the wide use of high performance concretes. The following properties are related to fresh concrete: ease of placement and ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860202

49. A Classical Kinetic Theory Approach to Lattice Boltzmann Simulation
Published: 10/1/2001
Author: Nicos Martys
Abstract: An approach to lattice Boltzmann simulation is described, which makes a direct connection between classical kinetic theory and contemporary lattice Boltzmann modeling methods. This approach can lead to greater accuracy, improved numerical stability ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860414

50. A New Approach to Lattice Boltzmann Simulation
Published: 10/1/2001
Author: Nicos Martys
Abstract: A new approach to lattice Boltzmann simulation is introduced which avoids the direct numerical determination of the single-particle distribution from the Boltzmann collision operator. Instead, one starts from the Chapman-Enskog expansion of the sing ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=860240



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