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RISS 인기검색어
- 검색키워드
- 저자 : ( Muh Rong Wang ) (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Characteristics of Twin-Fluid Micro-Atomizer with Internal Mixing Mechanisms
( Muh Rong Wang ),( K. H. Yang ),( J. S. Chiu ),( Deng Sang Lai ),( T. S. Leu ),( Sheng Chih Shen ) 한국액체미립화학회 2005 한국액체미립화학회 학술강연회 논문집 Vol.2005 No.-
The twin-fluid atomizer has three micro channels fabricated via MEMS bulk micro-machining processes, one for the liquid supply and two for introducing the atomization gas. The effects of the length scale of the micro-channels on the atomization performance are investigated. The orifice hydraulic diameter (dH) of the micro atomizer is 45μm. Malvern Insitec RT-Sizer is used to measure the particle size. Results show that the twin-fluid micro-atomizer with internal mixing mechanisms can produce fine spray with Sauter Mean Diameter of 5μm under the gas pressure of 5kg/cm2 and liquid flow rate of 0.1ml/min, a performance better than the micro atomizers reported in the literature. Flow visualization through a microscope shows that the micro-spray is unstable when the two impinging gas flows are staggered inside the atomizer. The micro-spray began to twist by these two impinging gas flows when the gas pressure goes up to 2 kg/cm2. The twisting angle and the cone angle of the spray remain constant when the gas pressure is more than 3 kg/cm2. Significant decrease in the particle size takes place when the gas pressure is more than 4kg/cm2. The atomization efficiency of the twin-fluid micro-atomizer with internal mixing mechanism is several times higher than other type of twin-fluid atomizers.
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( Muh Rong Wang ),( Tien Chu Lin ),( Che Jui Yang ),( Yang Sheng Huang ) 한국액체미립화학회 2005 한국액체미립화학회 학술강연회 논문집 Vol.2005 No.-
This paper investigates the droplet transport phenomenon in the developing region of the spray injected by the atomizer with internal impinging mechanisms. The characteristics of the spray are measured by a two-component phase Doppler particle analyzer (PDPA) and the images are taken by a high speed camera. Instantaneous flow image shows the intermittence of the spray jet as injected with internal impingement. On the other hand, a large-scaled sinusoidal flow structure along the axial direction is observed when the spray jet is injected without internal impingement. Hence flow impingement inside the atomizer has strong effects on the structure of the spray jet because of the enhanced mixing processes between the liquid and gas phases. It turns out that the spray jet with internal impingement has a wider and more uniform distribution. Measurements of the distribution of the spray droplets and volume flux justify the above observation.
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Penetration Processes of Soft Solid Materials by Needle-Free Micro-Injections
( Muh Rong Wang ),( Chun Hsien Chiu ),( Chien Chih Huang ),( Li Jay Cheng ),( Yang Sheng Huang ),( Min Chen ) 한국액체미립화학회 2010 한국액체미립화학회 학술강연회 논문집 Vol.2010 No.-
Penetration characteristics of the single pulse micro-jets into the soft solid materials of gelatin gels and porcine colons are investigated in this paper. The images of penetration processes were taken by IDT high-speed digital camera at the sampling rate of 2500 frames per second. The evolution of the penetration process, penetration depth, volume of infection and penetration rate is investigated. Gelatin gel is a good model material for the observation of the penetration processes because of the translucent property. In vitro penetrations of porcine colons were also tested for the prior study of endoscopic needle-free injection. The penetration test was performed under the single-pulsed mode at injection time of 0.1, 0.25 and 0.5 seconds. The injection pressure was in the range of 50 to 125 bar. The diameter of the injectors, do, is 250 and 300 m. According to the high-speed photos of the gel penetration, the injection processes can be described as four steps: 1. Initial compression period: the elastic compression of the soft solid material at the penetration site and the neighborhood. 2. Material failure period: the jet penetrates inside the gelatin gel including the initial surface crack and growth of the injected volume. 3. Elastic rebounding period: It takes place when the injection is stopped. The injected water starts to be squeezed out of the gelatin gel under the compression of the gelatin gel during the elastic relaxation processes until the final penetration depth and width. 4. Final stable period: the penetration depth and width inside the gelatin gel are fixed afterward. Furthermore, the injection tests on the porcine colon show the penetration into submucosal layer is possible under the injection pressure less than 60 bar with the orifice of 300 m and injection time of 0.1 sec. The injection power is 16 W under this condition. However, higher injection power is needed for the punch through injection of porcine colon. The failure stress of the porcine colon is 1.077 0.333 MPa by the deep penetration test.
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Performance of Twin-Fluid Atomizers with flow Impingement
( Muh Rong Wang ),( C. J. Yang ),( Tien Chu Lin ),( J. S. Chiu ),( K. H. Yang ) 한국액체미립화학회 2005 한국액체미립화학회 학술강연회 논문집 Vol.2005 No.-
This paper describes the characteristics of the twin-fluid atomizers with and without flow impingement. Malvern RT-Sizer and the particle image velocimetry (PIV) are used to measure the particle size and spray flow field. Velocity measurement by the PIV system indicates that the spray flow is decelerated in the axial direction and accelerated in the radial direction, resulting in a highly interactive flow pattern between particles. It also results in the formation of a large scale vortex and enhances the flow entrainment near the substrate. Results also show that the particle distribution of the atomizer with external substrate is more concentrated, indicating the re-distribution of the spray droplets during the flow impingement. It also implies that the flow impingement can be used as the mechanism to control the particle size distribution of the spray flow for particular engineering applications.
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