Fundamental understanding of the spray process is, however, still lacking and lags behind applications due to the high complexity of its stochastic behavior. Prof. LIN Jianzhong and his group proposed a comprehensive three-dimensional model to predict the droplet mean size and other spray characteristics by describing both primary and secondary atomization. Recently, they reviewed the theories, practical modeling treatments and the main achievements of modeling on effervescent atomization. Their work, entitled "Modeling on effervescent atomization: A review", was published in SCIENCE CHINA, 2011, DOI: 10.1007/s11433-011-4536-1.
Effervescent atomization is a method involving a twin-fluid process that involves bubbling gas within a liquid. Compared to conventional pressure, rotary and twin-fluid atomizers, the effervescent atomizer offers advantages of smaller drop sizes, reduced injection pressure, lower gas flow, a larger exit orifice, and tolerance for high viscosities. Effervescent atomization has been widely used in gas turbine combustors, IC engines furnaces and boilers, incineration, spray deposition, powder formation and other applications. Recently, the effervescent atomization method has been successfully applied in pharmaceutical coating and suspension plasma spray. Because effervescent atomization can handle a variety of liquids, it can play a pivotal role in reducing energy consumption during combustion and has potential for broad applications in the manufacture of high quality materials.
Effervescent atomizer performance has been the object of extensive research since the late 1980s. Studies on the atomization spray can be grouped into two broad categories: diagnostic measurements and numerical modeling. Diagnostic measurements have made a significant contribution to the development of effervescent atomization technology over the past two decades. Fundamental understanding of the spray process is challenging due to the high complexity of two-phase phenomena statistic behavior. Lin and his co-workers from Jiliang University and Zhejiang Universities, China, have devoted their efforts to establish a comprehensive numerical model to explain the phenomena involved in effervescent atomization spray. Their studies cover modeling of liquid fragmentation, the parametric study of various operating conditions, and the development of a fitting formula for droplet mean size and impinging factors.
The effervescent atomization process involves complex fluid-dynamic and transport phenomena. A typical effervescent atomization spray can be divided into four sub-domains, according to the different mechanisms involved. As shown in Fig.1, in the schematic for effervescent atomization spray generation, the first sub-domain is internal-mixing atomization, in which atomizing gas is bubbled into the liquid. The second step is a resulting two-phase mixture that is discharged from the atomizer orifice. Leaving the nozzle exit, the rapidly expanding gas phase will shatter the liquid into fine droplets, which can be referred to as primary atomization. The third domain lies downstream of the spray. The droplets produced by primary atomization are unstable in the turbulent spray and undergo a series of events such as collision, breakup and coalescence, and finally the droplets entrained in the gas jet will impinge on the plate or undergo further mass and heat transfer. Most modeling work has focused on the external two-phase flow out of the effervescent atomizer exit. The review paper focused on the Lagrangian treatment and introduced a comprehensive model capable of describing both primary and secondary breakup processes and correlating the droplet mean diameter and other spray characteristics with first principle operating conditions. The model comprises two sub-models. The first sub-model is used for simulating the primary breakup of the annular liquid sheath near the orifice and calculating the atomized droplet size. The second sub-model is based on a hybrid Eulerian/Lagrangian coordinate system to simulate the turbulent gas jet and injected droplets. This latter sub-model describes the gas jet and the droplet trajectory in three-dimensional geometry and also considers droplet breakup and collision.
The paper reviews the mechanism of droplet events and the numerical treatments of effervescent atomization, which involved the primary atomization of a Newtonian and a non-Newtonian fluid, particle tracking, secondary atomization and droplets collision. A comprehensive three-dimensional model of droplet-gas flow is introduced to describe the evolution of spray in the effervescent atomization spray. The evolution of droplet mean diameter along the axial distance, the mean size and statistical distribution of atomized droplets at cross sections, as well as the change in droplet velocity are calculated and analyzed to reveal their inner driving forces. The influence of operating conditions and liquid physical properties on atomization performance are discussed. The factors that promote the achievement of good atomization effects are identified. Based on the extensive computation, the influences of various operating conditions and liquid physical properties on atomization effects are quantified. The expressions for the Weber number and the K number, which is related to the operating parameters and liquid properties, are deduced. The formula can be used conveniently and effectively to judge the deposition behaviors of droplets onto surfaces for various Newton liquids. In addition to these achievements, the challenges for future numerical research and the scope for further applications are outlined.
Through academic study and modeling, the critical mechanisms and important parameters involved in effervescent atomization have been deeply understood and the applications of effervescent atomization technology have been successfully extended. This research project was mainly supported by the National Natural Science Foundation of China with Grant Nos. 11132008 and 11002136. The development of modeling approaches to atomization spray is based on previous studies involving many researchers from various institutions and universities.
Modeling of the external flow of effervescent atomization can be divided into two sub-models. The first sub-model is used to simulate the primary breakup of the annular liquid sheath near the orifice and calculating the atomized droplet size. The second sub-model is based on a hybrid Eulerian/Lagrangian coordinate system to simulate the turbulent gas jet and injected droplets.
See the article: Qian Lijuan, Lin Jianzhong. Modeling on effervescent atomization: A review. Science China Physics, Mechanics & Astronomy, 2011, DOI: 10.1007/s11433-011-4536-1
Lin Jianzhong | EurekAlert!
Physics boosts artificial intelligence methods
19.10.2017 | California Institute of Technology
NASA team finds noxious ice cloud on saturn's moon titan
19.10.2017 | NASA/Goddard Space Flight Center
University of Maryland researchers contribute to historic detection of gravitational waves and light created by event
On August 17, 2017, at 12:41:04 UTC, scientists made the first direct observation of a merger between two neutron stars--the dense, collapsed cores that remain...
Seven new papers describe the first-ever detection of light from a gravitational wave source. The event, caused by two neutron stars colliding and merging together, was dubbed GW170817 because it sent ripples through space-time that reached Earth on 2017 August 17. Around the world, hundreds of excited astronomers mobilized quickly and were able to observe the event using numerous telescopes, providing a wealth of new data.
Previous detections of gravitational waves have all involved the merger of two black holes, a feat that won the 2017 Nobel Prize in Physics earlier this month....
Material defects in end products can quickly result in failures in many areas of industry, and have a massive impact on the safe use of their products. This is why, in the field of quality assurance, intelligent, nondestructive sensor systems play a key role. They allow testing components and parts in a rapid and cost-efficient manner without destroying the actual product or changing its surface. Experts from the Fraunhofer IZFP in Saarbrücken will be presenting two exhibits at the Blechexpo in Stuttgart from 7–10 November 2017 that allow fast, reliable, and automated characterization of materials and detection of defects (Hall 5, Booth 5306).
When quality testing uses time-consuming destructive test methods, it can result in enormous costs due to damaging or destroying the products. And given that...
Using a new cooling technique MPQ scientists succeed at observing collisions in a dense beam of cold and slow dipolar molecules.
How do chemical reactions proceed at extremely low temperatures? The answer requires the investigation of molecular samples that are cold, dense, and slow at...
Scientists from the Max Planck Institute of Quantum Optics, using high precision laser spectroscopy of atomic hydrogen, confirm the surprisingly small value of the proton radius determined from muonic hydrogen.
It was one of the breakthroughs of the year 2010: Laser spectroscopy of muonic hydrogen resulted in a value for the proton charge radius that was significantly...
17.10.2017 | Event News
10.10.2017 | Event News
10.10.2017 | Event News
19.10.2017 | Materials Sciences
19.10.2017 | Materials Sciences
19.10.2017 | Physics and Astronomy