Study of the interaction between a hot gas jet and a liquid bath

1983 ◽  
Vol 44 (4) ◽  
pp. 358-363 ◽  
Author(s):  
N. V. Alekseev ◽  
O. E. Pozdnyakov ◽  
S. N. Shorin
Keyword(s):  
Liquid Bath ◽  
Gas Jet ◽  
Hot Gas

Advanced Diagnostics and Modeling of Spray Processes

MRS Bulletin ◽  
2000 ◽  
Vol 25 (7) ◽  
pp. 26-31 ◽  
Author(s):  
James R. Fincke ◽  
Richard A. Neiser
Keyword(s):  
Residual Stress ◽  
Stress State ◽  
Kinetic Energy ◽  
Particle Temperature ◽  
Surface Characteristics ◽  
Gas Jet ◽  
Hot Gas ◽  
Residual Stress State ◽  
Fraction Size ◽  
Thermally Sprayed

The microstructure and properties of thermally sprayed deposits depend critically on the thermal- and kinetic-energy histories of the particles entrained in the hot-gas jet. At impact, the particle temperature, molten fraction, size, velocity, and chemistry, along with substrate temperature and surface characteristics, control the morphology of individual particle splats. These factors control the adhesion, strength, microstructure, and porosity of a coating and influence the residual-stress state. In order to produce higher-quality coatings and expand the use of this versatile family of technologies, the ability to model and measure particle behavior is essential.

CFD Simulation of Thermocouple Measurement of Hot Gas Jets

2011 ◽  
Author(s):  
Sassan Etemad
Keyword(s):  
Reynolds Number ◽  
Cfd Simulation ◽  
Computational Cost ◽  
Gas Jet ◽  
Thermocouple Measurement ◽  
Fine Grid ◽  
Hot Gas ◽  
Spherical Bead ◽  
Modelling Methodology ◽  
Jet Nozzle

Turbulent convective heat transfer and radiation is simulated for a hot gas jet, impinging perpendicular on a flat surface at 2 jet diameters away from the jet nozzle. A small solid spherical bead, located in the jet centre half way from the wall, represents a thermocouple sensitive point. The bead becomes so hot that it radiates some heat to the colder surrounding surfaces. This phenomenon is responsible for a gap between the jet temperature and the bead temperature. The jet Reynolds number ranged from 7.67*103 to 4.52*104. Bead sizes 1.0 and 2.0 mm are used in jets at 500°C and 900°C. The simulations show that the mentioned temperature differences are significant and grow rapidly with high temperatures but decrease with Reynolds number. The temperature gap, which can be regarded as the thermocouple measurement error, increases also with the bead size. Simulations can be conducted for specific thermocouples with other shapes and materials to assist the measurement process. The modelling methodology is found to be promising for such demanding simulations that require a fine grid for resolving the field near the bead without using excessive cells in the rest of the domain. Hence, further work in this field is envisaged using the same methodology for solving convection, conduction and radiation in one single model and at a reasonable computational cost together with validating measurements. Hopefully this study contributes to a better understanding of the measurement of hot gas jet temperature and its improvement with the aid of simulations.

scholarly journals Research in a physical model with the top blowing of a gas-dynamic head and jet parameters at blowing of a liquid bath through an annular coaxial slit nozzle

2018 ◽  
Author(s):  
S.I. Semykin ◽  
T.S. Golub ◽  
S.A. Dudchenko ◽  
V.V. Vakulchuk
Keyword(s):  
Physical Model ◽  
Dynamic Pressure ◽  
Liquid Bath ◽  
Gas Jet ◽  
Oxygen Absorption ◽  
Equivalent Diameter ◽  
Depth Of Penetration ◽  
Gas Dynamic ◽  
Dynamic Head ◽  
Purge Gas

The aim of the work is to study the physical model of the gas-dynamic head of a gas jet and the parameters of its penetration into the liquid bath of the converter when it flows out of the annular slotted tuyere. The studies were carried out on a «cold» stand on a scale of 1:30 to a 160-m converter (taking into account the criteria of geometrical and physical similarity) using water as a liquid simulating a molten metal,. The averaged values of the depth of penetration of the gas stream of the jet at various blowing parameters were estimated. It is noted that when the upper purge through a coaxial slit nozzle with an increase in the pressure of the purge gas, the dynamic pressure of the depth of penetration of the jet increases. The increase in dynamic pressure and the depth of the introduction of a gas jet leads to an increase in the degree of impact on the bath and an increase in the degree of oxygen absorption by the melt. It was shown that, all other things being equal, the operation of a coaxial slit differs by a large impulse of exposure to a liquid than when blowing through an equivalent diameter slot through one centrally located nozzle, especially at pressures above 0.15-0.3 MPa. The possibilities of increasing the efficiency of the top blowing of the converter bath are shown through the use of a slotted coaxial nozzle.

Interaction between a liquid bath and a gas jet for different degrees of assimilation

1979 ◽  
Vol 36 (3) ◽  
pp. 297-303
Author(s):  
V. A. Surin ◽  
V. K. Erofeev ◽  
A. S. Grigor'yants ◽  
O. N. Zasukhin ◽  
Yu. N. Nazarov
Keyword(s):  
Liquid Bath ◽  
Gas Jet

Single-Tube Simulation of a Semi-Intermittent Pressure-Gain Combustor

2006 ◽  
Author(s):  
Pezhman Akbari ◽  
Dhruv Baronia ◽  
Razi Nalim
Keyword(s):  
Turbulent Flame ◽  
Supersonic Jet ◽  
Internal Flow ◽  
Operating Conditions ◽  
Gas Jet ◽  
Wall Region ◽  
Jet Mixing ◽  
Hot Gas ◽  
Wave Rotors ◽  
Successful Design

This work is aimed to investigate the fundamental combustion and reignition process in semi-intermittent pressure-gain combustors for gas turbine applications. A combustion-torch ignition method is used to simulate reignition in one tube of a pressure-gain combustor by employing burned gas produced in a pre-chamber combustor. Numerical flow and combustion simulations are performed to understand and guide preliminary experimental results. The computational fluid dynamics code StarCD® is used to predict internal flow and combustion upon attempted ignition by a hot gas jet. This study provides improved understanding of the complex, sub-millisecond processes involved: transient supersonic jet mixing, ignition, highly turbulent flame propagation, and shock-flame interaction in near-wall region. The results are useful for successful design of rotary pressure gain combustors or internal combustion wave rotors under various operating conditions.

615 A Study of Combustion Characteristics on Hot-Gas Jet Burner

2001 ◽  
Vol 2001.38 (0) ◽  
pp. 195-196
Author(s):  
Kaori ICHINOKI ◽  
Satoshi OKAJIMA ◽  
LE Van LU
Keyword(s):  
Combustion Characteristics ◽  
Gas Jet ◽  
Hot Gas
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