High frequency ultrasonic-assisted chemical absorption of CO 2 using monoethanolamine (MEA)

2017 ◽  
Vol 183 ◽  
pp. 136-144 ◽  
Author(s):  
W.H. Tay ◽  
K.K. Lau ◽  
A.M. Shariff
Keyword(s):  
High Frequency ◽  
Chemical Absorption ◽  
Ultrasonic Assisted

scholarly journals The influence of acoustic power on chemical absorption of CO2 using Slow Kinetic Solvent

2021 ◽  
Vol 287 ◽  
pp. 01002
Author(s):  
Fatemeh Shokrollahi ◽  
Lau Kok Keong
Keyword(s):  
High Frequency ◽  
Acoustic Power ◽  
Operating Conditions ◽  
Ultrasonic Power ◽  
Absorption Process ◽  
Absorption System ◽  
Chemical Absorption ◽  
Ultrasonic Assisted ◽  
Enhance Mass ◽  
Slow Kinetic

Ultrasonic Irradiation (UI) is an emerging technology that is used to assist the CO2 absorption process. Even for the slow kinetic solvents without using any chemical promoter, high-frequency UI might enhance mass transfer during the absorption process. For this purpose, it is essential to study the performance of a high-frequency ultrasonic-assisted absorption system under varied operating conditions. The ultrasonic power is considered as one of the main parameters during the absorption of CO2. Thus, in this paper, the influence of ultrasonic power is presented using Methyl diethanolamine (MDEA) as a chemical solvent. The ultrasonic power has been varied from 0 to 15.3 W. The results tend to show a significant absorption rate enhancement for higher ultrasonic power. Moreover, they prove that the high-frequency ultrasonic absorption system has high potential to be utilized to enhance the absorption using promoter-free MDEA.

Numerical Simulation of Plunge Force During the Plunge Phase of Friction Stir Welding and Ultrasonic Assisted FSW

2008 ◽  
Author(s):  
Kwanghyun Park ◽  
Bongsuk Kim ◽  
Jun Ni
Keyword(s):  
Numerical Simulation ◽  
Friction Stir Welding ◽  
High Frequency ◽  
Hybrid Welding ◽  
Ultrasonic Vibrations ◽  
Welding Quality ◽  
Friction Stir ◽  
Ultrasonic Assisted ◽  
Welding Force ◽  
Welding Technique

Ultrasonic assisted friction stir welding (UaFSW) is an hybrid welding technique, where high frequency vibration is superimposed on the movement of a rotating tool. The benefit of using ultrasonic vibration in the FSW process refers to the reduction in the welding force and to the better welding quality. The UaFSW system is being developed and its mechanism needs to be understood using both the experiments and the numerical simulations. In this paper, FE simulations of FSW and UaFSW using ABAQUS/Explicit were carried out to examine plunge forces during the plunge phase of FSW and UaFSW, respectively. First, the simulations of the conventional FSW process were validated. Then, simulation of UaFSW process was performed by imposing sinusoidal horizontal ultrasonic vibrations on the tool.

scholarly journals Ultrasonic Assisted Sintering Using Heat Converted from Mechanical Energy

Metals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 971 ◽  
Author(s):  
Zhiyuan Liu ◽  
Yang Ge ◽  
Dandan Zhao ◽  
Yan Lou ◽  
Yong Liu ◽  
...  
Keyword(s):  
High Frequency ◽  
Volume Diffusion ◽  
Mechanical Energy ◽  
Pure Aluminum ◽  
Maximum Temperature ◽  
Sintered Aluminum ◽  
The Hierarchical Structure ◽  
Ultrasonic Assisted ◽  
Interparticle Friction ◽  
Sintering Method

A new sintering method, namely ultrasonic assisted sintering (UAS), has been proposed using mechanical heat converted from high frequency motion between particles. Pure aluminum specimens with diameter of 5 mm and thickness of ~2 mm have been successfully sintered in two seconds. Based on the thermodynamic analysis, the underlying heating mechanism is quantitatively interpreted, which involves high-frequency interparticle friction and plastic deformation driven by ultrasonic squeezing. Consequently, temperature rises rapidly at a speed of about 300 K/s, and the maximum temperature reaches up to 0.9 times of melting point of the aluminum during UAS. The sintered specimens have a high density of dislocations, under the combined effects of dislocations and undulating stress field, volume diffusion coefficient for sintering increases by several orders of magnitude, therefore, rapid densification can be accomplished in seconds. In addition, the sintered aluminum has ultrahigh nanohardness (~1.13 GPa), which can be attributed to the hierarchical structure formed during UAS process.

Ultraschallunterstützte Umformung von Metallen*/Ultrasonic-assisted forming of metals - Development of a test bench for material characterization with 15 kHz ultrasonic vibrations

2015 ◽  
Vol 105 (10) ◽  
pp. 715-721
Author(s):  
M. Michalski ◽  
M. Merklein
Keyword(s):  
High Frequency ◽  
Material Characterization ◽  
Test Bench ◽  
Flow Behavior ◽  
High Frequency Oscillation ◽  
Experimental Investigations ◽  
Metallic Materials ◽  
Frequency Oscillation ◽  
Ultrasonic Assisted ◽  
Forming Tools

Umformwerkzeuge, die mit einer hochfrequenten mechanischen Schwingung überlagert werden, ermöglichen eine deutliche Reduzierung der benötigten Umformkräfte. Darauf aufbauend werden am Lehrstuhl für Fertigungstechnologie experimentelle Untersuchungen mit verschiedenen metallischen Werkstoffen durchgeführt, um deren Fließverhalten bei Ultraschallüberlagerung mit 15 kHz zu charakterisieren. Die aktuelle Studie befasst sich mit der Entwicklung und der Qualifizierung eines geeigneten Prüfstands.   Forming tools that are superimposed with a high frequency oscillation enable a considerable reduction of the required forming forces. On this basis experimental investigations with various metallic materials are conducted at the Institute of Manufacturing Technology to characterize the flow behavior during ultrasonic-assisted forming with 15 kHz oscillation frequency. This study is concerned with the development and the qualification of a suitable test bench.

Ultraschallunterstütztes Umformen und Verstemmen/Ultrasonic-assisted forming and caulking – Current results of the joint research project “UltraCaulk”

2017 ◽  
Vol 107 (01-02) ◽  
pp. 52-58
Author(s):  
U. Leicht ◽  
M. Michalski ◽  
M. Merklein
Keyword(s):  
High Frequency ◽  
Material Flow ◽  
High Frequency Oscillation ◽  
Research Project ◽  
Joint Research ◽  
Influence Of Process Parameters ◽  
Joint Research Project ◽  
Ultrasonic Assisted ◽  
Force Reduction ◽  
Ultrasonic Influence

Durch Überlagerung hochfrequenter Schwingungen in Umformprozessen können Prozesskräfte deutlich reduziert werden. Im Verbundprojekt UltraCaulk wird daher neben grundlegenden Untersuchungen zur Charakterisierung des Werkstoffverhaltens unter Ultraschall auch die Übertragbarkeit identifizierter Mechanismen auf den industriellen Verstemmprozess untersucht. Der Fachbeitrag beschreibt den Zusammenhang zwischen verschiedenen Prozessparametern und der resultierenden Kraftreduzierung sowie der Probenerwärmung.   Substantial force reductions can be achieved by superimposing high frequency oscillation on forming processes. The joint research project UltraCaulk focusses on fundamental investigations on the material flow behaviour during ultrasonic influence and the transferability of identified mechanisms on industrial caulking processes. This study analyses the influence of process parameters on the resulting force reduction and specimen heating.

High-Frequency Ultrasonic Assisted Natural Silk Fibroin: A Polycyclic Aromatic Hydrocarbons Scavenger

2019 ◽  
Vol 11 (11) ◽  
pp. 1531-1536
Author(s):  
Huawei He ◽  
Zhe Zhang ◽  
Zhenping Qi ◽  
Yanke Jiang ◽  
Mingliang Zuo ◽  
...  
Keyword(s):  
Polycyclic Aromatic Hydrocarbons ◽  
Silk Fibroin ◽  
Aromatic Hydrocarbons ◽  
High Frequency ◽  
Natural Silk ◽  
Ultrasonic Assisted ◽  
Polycyclic Aromatic

A Study on Ultrasonic Vibration Assisted Tapping of Titanium

2008 ◽  
Vol 47-50 ◽  
pp. 218-221 ◽  
Author(s):  
Kei Lin Kuo
Keyword(s):  
Titanium Alloy ◽  
Piezoelectric Actuator ◽  
High Frequency ◽  
Vibration Amplitude ◽  
Processing Parameters ◽  
Cutting Fluid ◽  
Revolution Speed ◽  
Undesirable Event ◽  
Ultrasonic Assisted ◽  
Experimental Runs

Tapping is a technique commonly employed to make internal threads in the fastening industry. However, sudden breakage of tool bits is the most undesirable event often encountered during thread tapping. In particular, this can most readily occur when making internal threads in blind-holes, especially holes smaller than M6. As such, any effort to prolong the life of the tap is both necessary as well as urgent. The present study tried to use the high frequency vibration generated by a piezoelectric actuator to make threads for the titanium alloy. The thread tapping process was analyzed in detail, involving the Taguchi experimentation method, in which an orthogonal array table, L3(34),was employed to design the experimental runs for use in this study. The effects of interacting processing parameters including the frequency of vibration, vibration amplitude, spindle revolution speed and cutting fluid used on the performance of the tapping process were examined. The result was compared with no ultrasonic-assisted tapping.

The Microstructure of Steatite (Protoenstatite)

1985 ◽  
Vol 43 ◽  
pp. 236-237
Author(s):  
W. E. Lee ◽  
A. H. Heuer
Keyword(s):  
High Frequency ◽  
Glass Ceramics ◽  
Magnesium Silicate ◽  
Beam Current ◽  
Glassy Matrix ◽  
Angle Of Incidence ◽  
X Ray ◽  
Mechanical And Electrical Properties ◽  
Argon Ions ◽  
High Temperature Polymorph

IntroductionTraditional steatite ceramics, made by firing (vitrifying) hydrous magnesium silicate, have long been used as insulators for high frequency applications due to their excellent mechanical and electrical properties. Early x-ray and optical analysis of steatites showed that they were composed largely of protoenstatite (MgSiO3) in a glassy matrix. Recent studies of enstatite-containing glass ceramics have revived interest in the polymorphism of enstatite. Three polymorphs exist, two with orthorhombic and one with monoclinic symmetry (ortho, proto and clino enstatite, respectively). Steatite ceramics are of particular interest a they contain the normally unstable high-temperature polymorph, protoenstatite.Experimental3mm diameter discs cut from steatite rods (∼10” long and 0.5” dia.) were ground, polished, dimpled, and ion-thinned to electron transparency using 6KV Argon ions at a beam current of 1 x 10-3 A and a 12° angle of incidence. The discs were coated with carbon prior to TEM examination to minimize charging effects.

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