10,651 research outputs found
J.A. Daigneau
No full textPhotograph - J.A. Daigneau building, Athabasca, Alberta. It was built in 1912 by Joseph Daigneau and burnt down in 198
Author inscription in The Chinese slave-girl: a story of woman's life in China
No full textThis edition includes a gift inscription by author Rev. J.A. Davis, "To Rev. A. G. Russell with the warmest regards of the author J.A. Davis."Davis, John Agnell, 1839-1897
DNS of hydrogen impinging jets at different nozzle-plate distances
No full textHydrogen nonpremixed impinging jets at difference nozzle-plate distances were examined using results obtained from direct numerical simulation (DNS) with flamelet generated manifold (FGM) chemistry. The Reynolds number used was Re=2000. The results presented were obtained for two different nozzle-plate distances of 4 and 8 jet nozzle diameters. The three-dimensional simulations clearly show the effects of nozzle-plate distances on flame temperature and thus wall heat transfer, which is critical for the design of combustors for hydrogen combustion. Results reported here also indicate that the preferential diffusion affects flame temperature and species mass fraction distributions. Moreover, the unsteady fluctuations of species profiles in the wall jet region characterise the complexity of the distributions of compositional structures in the near-wall region
Numerical analysis of flame surface density, flame normal and flame index in syngas nonpremixed impinging flames
No full textA non-premixed impinging jet flame is studied using three-dimensional direct numerical simulation with detailed chemical kinetics in order to investigate the influence of fuel variability on flame surface density, flame normal, and flame index for syngas combustion. Analyses indicate that the fuel composition greatly influences the hydrogen (H2)/carbon monoxide (CO)syngas combustion, not only on the local stoichiometric iso-mixture fraction surface distribution but also on the vortical structures in the flow field. As a result of CO addition to hydrogen-enriched combustion, changes of the reaction zone in the flammable layer, shift of peak flame surface density distribution, shift of nonpremixed regions and formation of widely populated scalar dissipation rate with respect to tangential strain rate are all found to appear
Direct numerical simulation of nonpremixed syngas burning with detailed chemistry
No full textHydrogen/carbon monoxide non-premixed syngas impinging jet flames were studied using three-dimensional direct numerical simulation (DNS) and flamelet generated manifolds (FGM) based on detailed chemical kinetics. The computational domain employed has a size of 4 jet diameters in the streamwise direction and 12 jet diameters in the cross-streamwise direction. The results presented in this study were performed using a uniform Cartesian grid with 200x600x600 points. The Reynolds number used was Re=2000, based on the inlet reference quantities. The spatial discretisation was carried out using a sixth-order accurate compact finite difference scheme and the discretised equations were temporally advanced using a third-order accurate fully explicit compact-storage Runge-Kutta scheme. Results show that the ratio of hydrogen and carbon monoxide in the syngas mixture significantly changes the flame characteristics including near-wall flame structure. The high diffusivity of hydrogen-rich syngas flame forms weaker vortices, results in a thicker flame. In contrast, carbon monoxide-rich syngas flame forms strong wrinkles, results in a thinner flame. Moreover, the DNS results suggest that the preferential diffusion influences the local flame structure for the simulated low Reynolds number hydrogen flame
Group living homes for older people with dementia: Concept and effects
Full text linkEefsting, J.A. [Promotor]Pot, A.M. [Promotor]Depla, M.F.I.A. [Copromotor]Lange, J. de [Copromotor
A Review of silicon carbide development in MEMS applications
Full text linkDue to its desirable material properties, Silicon Carbide (SiC) hasbecome an alternative material to replace Si for MicroelectromechanicalSystems (MEMS) applications in harsh environments. To promote SiC MEMSdevelopment towards future cost-effective products, main technology areas inmaterial deposition and processes have attracted significant interest. Thedevelopments in these areas have contributed to the rapid emergence of SiCMEMS prototypes. In this paper, we give an overview of the importantdevelopments in SiC material formation and fabrication processes in recentyears. Some of the most interesting state-of-the-art SiC MEMS devices arereviewed. This highlights the major progresses in SiC MEMS developed thusfar. This paper also looks into the prospect of SiC MEMS drawing attention topotential issues
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