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- 저자 : ( Chun-kuei Chen ) (검색결과 6 건)
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Impact of Two Drops on a Dry Surface
( Chun-kuei Chen ),( Sheng-qi Chen ),( Ta-hui Lin ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-
A group of two streamwise drops could be successfully generated by using the free-falling drops technique incorporated with a drop severance device in this study. Therefore, the impact characteristics of a group of two streamwise drops impinging on a dry surface will be experimentally examined and analyzed in this study. The water was considered as the working fluid, and the velocity of the drop was fixed to 1.9 ± 0.1 m/s. The initial diameter of the drop was fixed to 930 ± 30 ㎛ and 1025 ± 5 ㎛, respectively. This study focused on four cases of two drops impinging on a dry surface which classified by space difference (ㅿt). Conditions respectively being Case 1: single drop impinging, Case 2: ㅿt = 0.5 ms, Case 3: ㅿt = 1 ms and Case 4: ㅿt = 2.5 ms. The results showed two drops impinging on a dry surface for Case 2~4, the maximum spread diameter of drop was 1.3 times compared with the single drop at the same initial drop diameter, but the variation process of two drops impinging on a dry surface was different to the single drop.
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The Transition from Dripping to Jetting of a Water Jet Under Rigid Body Rotation
( Chun-chia Chang ),( Chun-kuei Chen ),( Ta-hui Lin ) 한국액체미립화학회 2017 한국액체미립화학회 학술강연회 논문집 Vol.2017 No.-
This research is dedicated to analyzing the characteristic of a liquid jet under various conditions, for example, different flow rate and rotating speed. In this study, we found out that the imposed rotation would shorten the breakup length of a liquid jet due to its extra disturbance. On the other hand, hysteresis behavior occurs when using relatively large nozzle diameter, which represents that the critical flow rate of the transition from dripping to jetting is different to that from jetting to dripping. Consequently, we further analyzed the critical rotating speed (Jetting→Dripping) and critical flow rate (Dripping→ Jetting) in this hysteresis zone. As for the last part of this study, the breakup patterns had been deducted, we can divided the breakup modes into three distinguished patterns basically by how the droplets are formed, which are steady formation, two-drop coalescence, multiple-drop coalescence, respectively. Last but not least, the mutual interaction between these three patterns and how the rotation affected the outcomes of a liquid jet are concluded in this research.
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Ping-Cheng Chen,Chung-Long Pan,Kuei-Chih Lin,Chun-Hsu Shen 한양대학교 청정에너지연구소 2024 Journal of Ceramic Processing Research Vol.25 No.2
The lower phase-forming temperature of magnesium titanate, MgTiO3, means that it can be used to replace magnesium ionswith cobalt ions at 0.05 mole when a mixture of diverse low melting point materials as sintering accelerators is employed(single: B2O3, CuO, V2O5, ZnO; binary: ZnO-B2O3). The phase formation of 0.9Mg0.95Co0.05TiO3 - 0.1 Ca0.61Nd0.78/3TiO3 dielectricceramics was verified using XRD diffraction to observe crystallites at different phases. SEM was used to observe the graingrowth of the ceramic system, and the composition ratio of the grain was analyzed via EDS. Compared with 0.9Mg0.95Co0.05TiO3- 0.1 Ca0.61Nd0.78/3TiO3 dielectric ceramics without the addition of a sintering accelerator, the results show that the sinteringtemperature could be effectively decremented, and the results of the binary addition were better than the single result. Themicrowave dielectric performances of 0.9Mg0.95Co0.05TiO3 - 0.1Ca0.61Nd0.78/3TiO3 dielectric ceramics were closely related tothe density and growth of grains experienced by the specimens. When 1 wt% binary sintering accelerators (ZnO-B2O3) wereadded to 0.9Mg0.95Co0.05TiO3-0.1 Ca0.61Nd0.78/3TiO3 dielectric ceramics, they showed an εr value of 21.7, a Qf value of 42,000 GHz,and a τf value of -27.2 ppm/oC; the phase-forming temperature was minimized from 1350 oC to 1150 oC.
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Drop Interaction in a Burning Drops Stream
( Wei Dong Hsieh ),( Chun Kuei Chen ),( Ta Hui Lin ),( Shuhn Shyurng Hou ) 한국액체미립화학회 2010 한국액체미립화학회 학술강연회 논문집 Vol.2010 No.-
In a spray combustion flow field, a burning drop may interact with other drops flowing in parallel streams or along the same flow stream. Many studies on drop interaction in parallel streams were reported. However, upstream/downstream interaction of drops along a burning drops stream has not been well studied literately. To understand such interesting phenomena, we established an experimental system to examine a burning dodecane drops stream with variable drop inter-spaces in a high-temperature oxygen-rich environment. Effects of the drop inter-space (s/di) and the oxygen concentration ΩO2) in the hot environment on the interaction of burning drops were investigated in the study. Drop inter-spaces were chosen to be 2.5, 5, 10, 30 and 100. Oxygen concentrations of 21%, 25% and 30% in the hot environment were considered. The flame propagation and interactions between the burning drops in the stream were performed. Results showed that the diffusion flame enclosing the drops stream is narrowed with the increase of ΩO2 whereas effect of ΩO2 is not obvious when s/di>30. The overall flame length was longer for lower s/di due to flame propagating across the drops. Evaporation rates remains constant when s/di>30 indicating a weak interaction of drops along the same stream.
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Wang Li-Kai,Lin Yao-Tsung,Chen Jui-Tai,Lan Winnie,Hung Kuo-Chuan,Chen Jen-Yin,Liu Kuei-Jung,Yen Yu-Chun,Chou Yun-Yun,Cherng Yih-Giun,Tam Ka-Wai 대한마취통증의학회 2023 Korean Journal of Anesthesiology Vol.76 No.4
Background: Shared decision making using patient decision aids (PtDAs) was established over a decade ago, but few studies have evaluated its efficacy in Asian countries. We therefore evaluated the application of PtDAs in a decision conflict between two muscle relaxant reversal agents, neostigmine and sugammadex, and sequentially analyzed the regional differences and operating room turnover rates.Methods: This multicenter, outcome-assessor-blind, randomized controlled trial included 3,132 surgical patients from two medical centers admitted between March 2020 and August 2020. The patients were randomly divided into the classical and PtDA groups for pre-anesthesia consultations. Their clinicodemographic characteristics were analyzed to identify variables influencing the choice of reversal agent. On the day of the pre-anesthesia consultation, the patients completed the four SURE scale (sure of myself, understand information, risk-benefit ratio, encouragement) screening items. The operating turnover rates were also evaluated using anesthesia records. Results: Compared with the classical group, the PtDA group felt more confident about receiving sufficient medical information (P < 0.001), felt better informed about the advantages and disadvantages of the medications (P < 0.001), exhibited a superior understanding of the benefits and risks of their options (P < 0.001), and felt surer about their choice (P < 0.001). Moreover, the PtDA group had a significantly greater tendency to choose sugammadex over neostigmine (P < 0.001). Conclusions: PtDA interventions in pre-anesthesia consultations provided surgical patients with clear knowledge and better support. PtDAs should be made available in other medical fields to enhance shared clinical decision-making.
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