scholarly journals Flow Field Characterization of an Angled Supersonic Jet Near a Bluff Body

2010 ◽  
Author(s):  
John Wolter ◽  
Robert Childs ◽  
Mark Wernet ◽  
Andrea Nelson ◽  
John Melton
Keyword(s):  
Flow Field ◽  
Bluff Body ◽  
Supersonic Jet

scholarly journals Geomorphological characterization of the 2014–2015 Holuhraun lava flow-field in Iceland

2021 ◽  
pp. 107278
Author(s):  
Joana R.C. Voigt ◽  
Christopher W. Hamilton ◽  
Stephen P. Scheidt ◽  
Ulrich Münzer ◽  
Ármann Höskuldsson ◽  
...  
Keyword(s):  
Flow Field ◽  
Lava Flow ◽  
Lava Flow Field

Effects of Acoustic Excitation on a Swirling Diffusion Flame

2010 ◽  
Vol 132 (12) ◽  
Author(s):  
Michael E. Loretero ◽  
Rong F. Huang
Keyword(s):  
Flow Field ◽  
Bluff Body ◽  
Excitation Frequency ◽  
Excitation Amplitude ◽  
Mie Scattering ◽  
Flame Length ◽  
Laser Doppler Velocimeter ◽  
Scattering Method ◽  
Acoustic Excitation ◽  
Characteristic Modes

A swirling double concentric jet is commonly used for nonpremixed gas burner application for safety reasons and to improve the combustion performance. Fuel is generally spurted at the central jet while the annular coflowing air is swirled. They are normally separated by a blockage disk where the bluff-body effects further enhance the recirculation of hot gas at the reaction zone. This paper aims to experimentally investigate the behavior of flame and flow in a double concentric jet combustor when the fuel supply is acoustically driven. Laser-light sheet assisted Mie scattering method has been used to visualize the flow, while the flame lengths were measured by a conventional photography technique. The fluctuating velocity at the jet exit was measured by a two-component laser Doppler velocimeter. Flammability and stability at first fuel tube resonant frequency are reported and discussed. The evolution of flame profile with excitation level is presented and discussed, together with the reduction in flame length. The flame in the unforced reacting axisymmetric wake is classified into three characteristic modes, which are weak swirling flame, lifted flame, and transitional reattached flame. These terms reflect their primary features of flame appearances, and when the acoustic excitation is applied, the flame behaviors change with the excitation frequency and amplitude. Four additional characteristic modes are identified; e.g., at low excitation amplitudes, wrinkling flame with a blue annular film is observed because the excitation induces vortices in the central fuel jet and hence gives rise to the wrinkling of flame. The central jet vortices become larger with the increase in excitation amplitude and thus lead to a wider and shorter flame. If the excitation amplitude is increased above a certain value, the central jet vortices change the rotation direction and pacing with the annular jet vortices. These changes in the flow field induce large turbulent intensity and mixing and therefore make the flame looks blue and short. Further increase in the excitation amplitude would lift the flame because the flow field would be dramatically modified.

Characterization of non-solvent precipitated starch using asymmetrical flow field-flow fractionation coupled with multiple detectors

2019 ◽  
Vol 206 ◽  
pp. 21-28 ◽  
Author(s):  
Catalina Fuentes ◽  
Hisfazilah Saari ◽  
Jaeyeong Choi ◽  
Seungho Lee ◽  
Malin Sjöö ◽  
...  
Keyword(s):  
Flow Field ◽  
Field Flow Fractionation ◽  
Flow Fractionation ◽  
Multiple Detectors

Molar Mass Characterization of Crude Lignosulfonates by Asymmetric Flow Field-Flow Fractionation

2018 ◽  
Vol 7 (1) ◽  
pp. 216-223 ◽  
Author(s):  
Irina Sulaeva ◽  
Philipp Vejdovszky ◽  
Ute Henniges ◽  
Arnulf Kai Mahler ◽  
Thomas Rosenau ◽  
...  
Keyword(s):  
Flow Field ◽  
Molar Mass ◽  
Field Flow Fractionation ◽  
Asymmetric Flow ◽  
Flow Fractionation
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