scholarly journals Effects of Y-Jet Nozzle Mixing Chamber Length and the GLR on Spatial Asymmetric Spray

ACS Omega ◽  
2021 ◽  
Author(s):  
Sang Ji Lee ◽  
Ji Yeop Kim ◽  
Jung Goo Hong
Keyword(s):  
Chamber Length ◽  
Mixing Chamber ◽  
Jet Nozzle

scholarly journals Spraying of Viscous Liquids: Influence of Fluid-Mixing Mechanism on the Performance of Internal-Mixing Twin-Fluid Atomizers

2020 ◽  
Vol 10 (15) ◽  
pp. 5249
Author(s):  
Marek Mlkvik ◽  
Jan Jedelsky ◽  
Heike P. Karbstein ◽  
Volker Gaukel
Keyword(s):  
Optical Diffraction ◽  
Liquid Fuels ◽  
Liquid Viscosity ◽  
Two Phase ◽  
Internal Mixing ◽  
Mixing Chamber ◽  
Wide Range ◽  
Effervescent Atomizer ◽  
The Common ◽  
Jet Nozzle

The thermal usage of liquid fuels implies their combustion, which is a process strongly influenced by the performance of the atomizer, which disrupts the fuel into drops of the required sizes. The spray quality of the twin-fluid atomizers with internal mixing (IM-TFA) is primarily influenced by the two-phase flow pattern inside the mixing chamber. We studied the performance of the four types of the IM-TFA nozzles by the optical diffraction system (Malvern Spraytec) to answer the question of how the mixing chamber design influences the spray quality at low atomizing gas consumption. We tested the effervescent atomizer in outside-in-liquid (OIL) and outside-in-gas (OIG) configurations, the Y-jet nozzle and new nozzle design, and the CFT atomizer when spraying model liquids with the viscosities comparable to the common fuels (μ=60and143 mPa· s). We found that the effervescent atomizer performance was strongly influenced by the configuration of the inlet ports. Although the OIL configuration provided the best spray quality (D32 = 72 μm), with the highest efficiency (0.16%), the OIG nozzle was characterized by unstable work and poor spray quality. Both the devices were sensitive to liquid viscosity. The Y-jet nozzle provided a stable performance over the liquid viscosity spectrum, but the spray quality and efficiency were lower than for the OIL nozzle. Our findings can be used to improve the performance of the common IM-TFA types or to design new atomizers. The results also provide an overview of the tested atomizers’ performances over the wide range of working conditions and, thus, help to define the application potential of the tested nozzle designs.

Investigation of Two-Phase Flow in an Effervescent Atomizer

2014 ◽  
Author(s):  
Mona Hassanzadeh Jobehdar ◽  
Aly H. Gadallah ◽  
Kamran Siddiqui ◽  
Wajid A. Chishty
Keyword(s):  
Internal Combustion Engines ◽  
Two Phase Flow ◽  
Separation Bubble ◽  
Phase Flow ◽  
Two Phase ◽  
Chamber Length ◽  
Flat Base ◽  
Mixing Chamber ◽  
Wide Range ◽  
Effervescent Atomizer

Aerated-liquid atomization, also called “effervescent atomization”, is a technique that has a wide range of applications such as gas turbine combustors, internal combustion engines, furnaces and burners, and pharmaceutical sprays. We report on an experimental study conducted to investigate the two-phase flow in an Effervescent atomizer. A novel aerator tube base was implemented and tested. It is observed that the novel configuration suppresses the separation bubble at the trailing edge and results in more uniform and smaller bubbles compared to the standard flat base aerator. It has been found that the more uniform and smaller bubbles are generated as the mixing chamber length is reduced. It is concluded that by using a conical base aerator and by reducing the mixing chamber length, the spray steadiness and the atomization process can be significantly improved.

Experimental Determination of Geometric Parameters for an Annular Injection Type Supersonic Ejector

2006 ◽  
Vol 128 (6) ◽  
pp. 1164-1171 ◽  
Author(s):  
Sehoon Kim ◽  
Sejin Kwon
Keyword(s):  
Secondary Flow ◽  
Static Pressure ◽  
Area Ratio ◽  
Geometric Parameters ◽  
Cross Sectional ◽  
Chamber Length ◽  
Supersonic Ejector ◽  
Mixing Chamber ◽  
Flow Pressure ◽  
Contraction Angle

The effects of four geometric parameters of an annular injection supersonic ejector, namely, the primary nozzle exit-to-throat area ratio, the contraction angle of the mixing chamber, the cross-sectional area and L/D ratio of the second-throat on the performance parameters including the secondary flow pressure, the starting pressure and unstarting pressure were investigated experimentally. The starting pressure exhibits linearly proportional dependence on the throat area ratio when the mixing chamber length is less than a certain critical value. For a longer mixing chamber, the starting pressure is proportional to the mixing chamber length while the unstarting pressure depends on the throat area ratio only. The geometric parameters of the second-throat do not affect the static pressure of the secondary flow. This implies that the secondary flow is aerodynamically choked in the mixing chamber and the static pressure of the secondary flow is determined by the choking condition since the mixing chamber of the annular injection ejector is relatively long. Based on the findings by the experiment, a simplified analytical model was proposed to predict the secondary flow pressure. The predicted secondary flow pressure agrees reasonably well with the measurement for a small contraction angle of the mixing chamber.

scholarly journals Numerical Investigation on the Performance of Two-Throat Nozzle Ejectors with Different Mixing Chamber Structural Parameters

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6900
Author(s):  
Fatong Jia ◽  
Dazhang Yang ◽  
Jing Xie
Keyword(s):  
Structural Parameters ◽  
Operational Performance ◽  
Water Heater ◽  
Chamber Length ◽  
Heat Pump Water Heater ◽  
Mixing Chamber ◽  
Optimal Value ◽  
Nozzle Geometries ◽  
Converging Angle ◽  
Chamber Diameter

In this study, the effects of the mixing chamber diameter (Dm), mixing chamber length (Lm) and pre-mixing chamber converging angle (θpm) were numerically investigated for a two-throat nozzle ejector to be utilized in a CO2 refrigeration cycle. The developed simulated method was validated by actual experimental data of a CO2 ejector in heat pump water heater system from the published literature. The main results revealed that the two-throat nozzle ejectors can obtain better performance with Dm in the range of 8–9 mm, Lm in the range of 64–82 mm and θpm at approximately 60°, respectively. Deviation from its optimal value could lead to a poor operational performance. Therefore, the mixing chamber structural parameters should be designed at the scope around its optimal value to guarantee the two-throat nozzle ejector performance. The following research can be developed around the two-throat nozzle geometries to strengthen the ejector performance.

Numerical investigation on the influence of mixing chamber length on steam ejector performance

2020 ◽  
Vol 174 ◽  
pp. 115204 ◽  
Author(s):  
Jingming Dong ◽  
Qiuyu Hu ◽  
Mengqi Yu ◽  
Zhitao Han ◽  
Wenbin Cui ◽  
...  
Keyword(s):  
Numerical Investigation ◽  
Chamber Length ◽  
Steam Ejector ◽  
Mixing Chamber

Simulation and experiment study of the self-excited oscillating mixer with abrasive jet used for the descaling of rusty steel

2019 ◽  
Vol 233 (5) ◽  
pp. 1109-1127 ◽  
Author(s):  
Hui Ji ◽  
Xiurong Cao ◽  
Songlin Nie ◽  
Fanglong Yin
Keyword(s):  
Simulation Experiment ◽  
Inlet Pressure ◽  
Abrasive Water Jet ◽  
Strip Steel ◽  
Chamber Length ◽  
Mixing Chamber ◽  
Excited Oscillation ◽  
Simulation And Experiment ◽  
Jet Characteristics ◽  
Chamber Diameter

A novel self-excited oscillating mixer is developed for the descaling of strip steel, which synthesizes the post-mixed abrasive water jet and self-excited oscillation. The realizable k-ɛ model is selected to investigate the effects of different abrasive entrance, inlet pressure, mixing chamber diameter, and length on the jet characteristics. Meanwhile, the effects of different inlet pressure and target distance on the outlet velocities for two kinds of mixers (including the developed mixer and conventional post-mixing mixer) with or without abrasive jet are investigated through simulation. Experiment as well as simulation results exhibited: (1) The oblique abrasive entrance can accelerate the mixture of water and abrasive due to its larger turbulent kinetic energy, and its outlet velocity is larger than that of radial and axial abrasive entrances. (2) For the developed mixer, the outlet velocity is preferable when the mixing chamber diameter is about 40–50 mm and the mixing chamber length is 20 mm. (3) The descaling efficiency of the developed mixer is superior to that of conventional post-mixing mixer. The research will lay foundation to optimize the structure of self-excited oscillating mixer for the descaling of rusty steel.

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