Introduction. Katz [2] has proposed a method of analysis of tubular catalytic reactors which, in principle, will allow the determination of the actual kinetics of the surface reaction even in the presence of a moderately slow rate of diffusion to and from the surface. The catalyst is deposited on the tube wall and the reacting fluid allowed to flow past under conditions of known hydrodynamics. ...

We describe the use of flow cytofluorometry to type lymphocytes for HLA-B27 antigens. We modified the cytotoxicity test of Terasaki and McClelland [Nature (London) 1964;204:998] for use with a flow cytofluorometer. In a second assay we used a commercially available monoclonal anti-HLA-B27 antibody and indirect immunofluorescence staining of cell surfaces. Although this antibody cross reacts wit...

Combustion is the source of eighty percent of the energy produced in the world: it is therefore a topic of major interest in the present context of global warming and decreasing fuel resources. Simulating combustors and especially instability mechanisms in these systems has become a central issue in the combustion community in the last ten years. This can be achieved only on massively parallel ...

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We study the behavior of reacting tracers in a chaotic flow. In particular, we look at an autocatalytic reaction and at a bistable system which are subjected to stirring by a chaotic flow. The impact of the chaotic advection is described by a one-dimensional phenomenological model. We use a nonperturbative technique to describe the behavior near a saddle node bifurcation. We also find an approx...

Hypersonic chemically reacting flow around a wedge in the near-continuum regime was numerically studied by the DSMC method with the main goal of validation of real gas effect models. The influence of vibration-dissociation coupling on the results of numerical simulations was analyzed. To this end, two models of chemical reactions were used in the computations, the total collisional energy model...

Since a large number of physical parameters influence the flame dynamics in a full scale gas turbine combustor, it is virtually impossible to develop physically correlated reduced order models for flame dynamics by directly studying these complex reacting flows. Even the Rijke tube combustor system, though comprising of a simple geometry and a flat flame, shows a strong nonlinear coupling betwe...

We have examined the opsonic activity of sera from patients with Neisseria meningitidis (B:15:P1.16) infections against different meningococcal strains, using flow cytometry and luminol-enhanced chemiluminescence. A marked increase in the phagocytosis of ethanol-fixed meningococcal strains of different serogroups, serotypes, and serosubtypes was demonstrated in the presence of convalescence ser...

Large-eddy simulations are used to demonstrate the effects of Rayleigh-Taylor instabilities (RTIs) on constant-pressure, turbulent premixed flames stabilized in a curved rectangular duct. A splitter plate constant radius separates reactant and pilot stream such that flame stabilizes mixing layer between two streams. Centrifugal acceleration due duct curvature induces RTI, increasing higher-dens...

Buoyancy produced by autocatalytic reaction fronts can produce fluid flows that advect the front position, giving rise to interesting feedback between chemical and hydrodynamic effects. In this paper, we numerically investigate the evolution of autocatalytic iodate-arsenous acid reaction fronts initialized in spherical configurations. Deformation of these "autocatalytic balls" is driven by buoy...