Study of an Annular Photoreactor with Tangential Inlet and Outlet. II. The UV/H2 O2 Reactive Flow

2019 ◽  
Vol 42 (2) ◽  
pp. 316-326 ◽  
Author(s):  
José Carlos G. Peres ◽  
Pamela C. Tambani ◽  
Antonio Carlos S. C. Teixeira ◽  
Roberto Guardani ◽  
Ardson dos S. Vianna
Keyword(s):  
Reactive Flow ◽  
Tangential Inlet

Unsteady MHD Free Convection And Chemically Reactive Flow Past An Infinite Vertical Porous Plate

2013 ◽  
Vol 8 (3) ◽  
pp. 35-40 ◽  
Author(s):  
M. C. Raju ◽  
◽  
S.V.K. Varma ◽  
R. Ramakoteswara Rao ◽  
◽  
...  
Keyword(s):  
Free Convection ◽  
Porous Plate ◽  
Reactive Flow ◽  
Vertical Porous Plate ◽  
Flow Past

Preliminary Studies on Non-Reactive Flow Vortex Cooling

2019 ◽  
Vol 12 (3) ◽  
pp. 262-271
Author(s):  
T.N. Rajesh ◽  
T.J.S. Jothi ◽  
T. Jayachandran
Keyword(s):  
Combustion Chamber ◽  
Inner Core ◽  
Rocket Engine ◽  
Injection Pressure ◽  
Chamber Pressure ◽  
Reactive Flow ◽  
Stoichiometric Ratio ◽  
Gaseous Oxygen ◽  
Mixture Ratio ◽  
Vortex Combustion

Background: The impulse for the propulsion of a rocket engine is obtained from the combustion of propellant mixture inside the combustion chamber and as the plume exhausts through a convergent- divergent nozzle. At stoichiometric ratio, the temperature inside the combustion chamber can be as high as 3500K. Thus, effective cooling of the thrust chamber becomes an essential criterion while designing a rocket engine. Objective: A new cooling method of thrust chambers was introduced by Chiaverni, which is termed as Vortex Combustion Cold-Wall Chamber (VCCW). The patent works on cyclone separators and confined vortex flow mechanism for providing high propellant mixing with improved degree of turbulence inside the combustion chamber, providing the required notion for studies on VCCW. The flow inside a VCCW has a complex structure characterised by axial pressure losses, swirl velocities, centrifugal force, flow reversal and strong turbulence. In order to study the flow phenomenon, both the experimental and numerical investigations are carried out. Methods: In this study, non-reactive flow analysis was conducted with real propellants like gaseous oxygen and hydrogen. The test was conducted to analyse the influence of mixture ratio and injection pressure of the propellants on the chamber pressure in a vortex combustion chamber. A vortex combustor was designed in which the oxidiser injected tangentially at the aft end near the nozzle spiraled up to the top plate and formed an inner core inside the chamber. The fuel was injected radially from injectors provided near the top plate and the propellants were mixed in the inner core. This resulted in enhanced mixing and increased residence time for the fuel. More information on the flow behaviour has been obtained by numerical analysis in Fluent. The test also investigated the sensitivity of the tangential injection pressure on the chamber pressure development. Results: All the test cases showed an increase in chamber pressure with the mixture ratio and injection pressure of the propellants. The maximum chamber pressure was found to be 3.8 bar at PC1 and 2.7 bar at PC2 when oxidiser to fuel ratio was 6.87. There was a reduction in chamber pressure of 1.1 bar and 0.7 bar at PC1 and PC2, respectively, in both the cases when hydrogen was injected. A small variation in the pressure of the propellant injected tangentially made a pronounced effect on the chamber pressure and hence vortex combustion chamber was found to be very sensitive to the tangential injection pressure. Conclusion: VCCW mechanism has been to be found to be very effective for keeping the chamber surface within the permissible limit and also reducing the payload of the space vehicle.

Numerical studies and analysis on reactive flow in carbonate matrix acidizing

2021 ◽  
Vol 201 ◽  
pp. 108487
Author(s):  
Cunqi Jia ◽  
Kamy Sepehrnoori ◽  
Zhaoqin Huang ◽  
Haiyang Zhang ◽  
Jun Yao
Keyword(s):  
Reactive Flow ◽  
Matrix Acidizing ◽  
Numerical Studies ◽  
Carbonate Matrix

The Investigation of Back-Mixing Particles near Dust Outlet in Cyclone Separator with Tangential Inlet

2011 ◽  
Vol 239-242 ◽  
pp. 2142-2148
Author(s):  
Hui Min Tan ◽  
Jian Jun Wang ◽  
You Hai Jin
Keyword(s):  
Mass Flow Rate ◽  
Mass Flow ◽  
Flow Rate ◽  
Particle Diameter ◽  
Particle Mass ◽  
Cyclone Separator ◽  
Axial Distribution ◽  
Computational Fluid Dynamics Analysis ◽  
Back Mixing ◽  
Tangential Inlet

Based on experimental and computational fluid dynamics analysis, the phenomenon of particle back-mixing near the dust outlet in cyclone separator with tangential inlet was studied. The results show that particle back-mixing appears near the dust outlet geometry. Particle back-mixing can be divided into dust hopper back-mixing and discharge cone back-mixing for different generation mechanism. The upward flow coming from dust hopper, which occupies 17.7% of the inlet gas, can induce dust hopper back-mixing. The particle mass flow rate that caused by dust hopper back-mixing occupies 46.6% of total inlet particle mass flow rate. Precessing vortex core, bias flow and high turbulent intensity near the dust outlet can induce discharge cone back-mixing. For both dust hopper back-mixing and discharge cone back-mixing, particle back-mixing is serious near the dust outlet geometry, which occupies 56.8% of total inlet particle mass flow rate. Particle which is smaller than 18μm can mix backward. The axial distribution of particle concentration decreases sharply in a range of 1.5 D (cyclone diameter) height above the dust discharge port. At last, only 2.6% of back-mixing particles with diameter no bigger than 13μm escape from vortex finder. This effect on separator efficiency increases with the particle diameter decreases.

Tomographic analysis of reactive flow induced pore structure changes in column experiments

2009 ◽  
Vol 32 (9) ◽  
pp. 1396-1403 ◽  
Author(s):  
Rong Cai ◽  
W. Brent Lindquist ◽  
Wooyong Um ◽  
Keith W. Jones
Keyword(s):  
Pore Structure ◽  
Reactive Flow ◽  
Column Experiments ◽  
Structure Changes ◽  
Tomographic Analysis

scholarly journals Analytic Model of Reactive Flow

2005 ◽  
Vol 30 (5) ◽  
pp. 381-385 ◽  
Author(s):  
P. Clark Souers ◽  
Peter Vitello
Keyword(s):  
Reactive Flow ◽  
Analytic Model
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