Numerical Study of a Dual-Mode Combustor Flowfield

2002 ◽  
Author(s):  
Tarek Abdel-Salam ◽  
S Tiwari ◽  
T. Mohieldin
Keyword(s):  
Numerical Study ◽  
Dual Mode

scholarly journals A numerical study on the closed packed array of gold discs as an efficient dual mode plasmonic tweezers

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Abolfazl Aqhili ◽  
Sara Darbari
Keyword(s):  
Numerical Study ◽  
Gold Surface ◽  
Plasmon Mode ◽  
Spatial Proximity ◽  
Periodic Pattern ◽  
Gradient Force ◽  
Dual Mode ◽  
Incident Wavelength ◽  
Trapped Particles ◽  
Thermal Simulations

AbstractIn this report, we propose the closed pack array of gold discs on glass, as a dual mode plasmonic tweezers that benefits from two trapping modes. The first trapping mode is based on leaky surface plasmon mode (LSPM) on the gold discs with a longer penetration depth in the water and a longer spatial trapping range, so that target nanoparticles with a radius of 100 nm can be attracted toward the gold surface from a vertical distance of about 2 µm. This trapping mode can help to overcome the inherent short range trapping challenge in the plasmonic tweezers. The second trapping mode is based on the dimer surface plasmonic mode (DSPM) in the nano-slits between the neighboring gold discs, leading to isolated and strong trapping sites for nanoparticles smaller than 34 nm. The proposed plasmonic tweezers can be excited in both LSPM and DSPM modes by switching the incident wavelength, resulting in promising and complementary functionalities. In the proposed plasmonic tweezers, we can attract the target particles towards the gold surface by LSPM gradient force, and trap them within a wide half widthhalfmaximum (HWHM) that allows studying the interactions between the trapped particles, due to their spatial proximity. Then, by switching to the DSPM trapping mode, we can rearrange the particles in a periodic pattern of isolated and stiff traps. The proposed plasmonic structure and the presented study opens a new insight for realizing efficient, dual-mode tweezers with complementary characteristics, suitable for manipulation of nanoparticles. Our thermal simulations demonstrate that the thermal-induced forces does not interefe with the proposed plasmonic tweezing.

Numerical Study of Dual Mode Generation Using a Sampled-Grating High-Order Quantum-Dot Based Laterally-Coupled DFB Laser

2013 ◽  
Vol 49 (10) ◽  
pp. 821-828 ◽  
Author(s):  
Akram Akrout ◽  
Kais Dridi ◽  
Sawsan Abdul-Majid ◽  
Joe Seregelyi ◽  
Trevor J. Hall
Keyword(s):  
Quantum Dot ◽  
Numerical Study ◽  
High Order ◽  
Dual Mode ◽  
Dfb Laser ◽  
Sampled Grating ◽  
Mode Generation

Experimental and Numerical Study of a Dual-mode Scramjet Combustor

2006 ◽  
Vol 22 (3) ◽  
pp. 481-489 ◽  
Author(s):  
C. P. Goyne ◽  
C. G. Rodriguez ◽  
R. H. Krauss ◽  
J. C. McDaniel ◽  
C. R. McClinton
Keyword(s):  
Numerical Study ◽  
Dual Mode ◽  
Scramjet Combustor

Numerical Simulation of Dual-Mode Scramjet Combustor with Significant Upstream Interaction

2012 ◽  
Vol 2 (3) ◽  
pp. 60-74
Author(s):  
Rahul Ingle ◽  
Debasis Chakraborty
Keyword(s):  
Surface Pressure ◽  
Stokes Equations ◽  
Numerical Study ◽  
Three Dimensional ◽  
Interaction Model ◽  
Navier Stokes ◽  
Dual Mode ◽  
Fast Kinetics ◽  
Scramjet Combustor ◽  
Flow Features

This paper is concerned with a numerical study corresponding to experimental investigation of Chinzei and co-workers on hydrogen fueled dual-mode scramjet engine essentially to understand the key features of upstream interaction, mixing and combustion. Three dimensional Navier Stokes equations along with a K-? turbulence model and infinitely fast kinetics are solved using commercial CFD software. Reasonable agreement has been obtained between the computed surface pressure with experimental values and the results of other numerical simulations. Insights into the flow features inside the combustor are obtained through analysis of various thermochemical parameters. The comparison of surface pressure with experimental results and other numerical results demonstrated that simple kinetics and turbulence – chemistry interaction model may be adequate to address the overall flow features in the combustor. A principal conclusion is that the boundary layer at the combustor entry has a pronounced effect on the flow development in the dual-mode scramjet combustor and causes significant upstream interaction.

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