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장대호(Jang Dae-Ho),두화웨이(Du Huawei),김동준(Kim Dong-Jun),양희천(Yang Hei-Cheon) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
The aim of this study is to investigate the flow characteristics of two different type water-air ejectors. The ejectors consist of primary and suction nozzles, a parallel mixing tube and a diffuser. Experimental parameters are primary nozzle position (ejector pitch), mixing tube length, diffuser angle and length. The air entrainment ratio increased with the ejector pitch, the mixing tube length and the diffuser length, while the ratio decreased with the primary nozzle diameter and the diffuser angle for central driven ejector. The air entrainment ratio increased with the diffuser length and angle, while the ratio decreased with the ejector pitch and the mixing tube length for annular driven ejector.
환형노즐 이젝터를 이용한 폭기조의 산소전달 특성에 대한 실험적 연구
두화웨이(Huawei Du),장대호(Dae-Ho Jang),김동준(Dong-Jun Kim),양희천(Hei-Cheon Yang) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Ejector type oxygen transfer systems that use the kinetic energy of a high-velocity liquid jet to entrain and disperse a gas phase have attracted interest in recent years. The objective of this study is to experimentally investigate the flow and oxygen transfer characteristics of an aeration system using an annular nozzle ejector. The aeration system consisted of an electric motor-pump, a motorized blower, an annular nozzle ejector assembly, an aeration tank, a control panel, and measuring and controlling accessories such as a dissolved oxygen meter, water and air flow meters, pressure and vacuum gauges and control valves. The primary water flow rate increased with the screw pitch, while the suction fluid flow rate increased initially and then decreased with the screw pitch due to the variation of suction inlet vacuum pressure. The saturation times and volumetric mass transfer coefficients varied with the suction air flow rate.
Surface plasmon remonance based single-walled carbon nanotube detection
Won-Hwi Na(나원휘),Dae-Ho Jang(장대호),Nam-jun Kim(김남준),Se-Hyun Shin(신세현) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
In this study, we developed detection method of single-walled carbon nanotubes (SWNTs) in an aqueous solution using surface plasmon resonance (SPR) spectroscopy. A strong affinity conjugation with biotin-streptavidin was adopted for a sensitive and specific detection on a sensing mechanism. During the pretreatment process, the SWNT surface was functionalized and hydrophilized using a thymine-chain based biotinylated single-strand DNA linker. In addition, bovine serum albumin was added to enhance the degree of dispersion of SWNT. The pretreated SWNTs were captured on a sensing sensor chip surface by streptavidins immobilized on biotilylated gold sensing film. The captured SWNTs were measured in real-time using SPR spectroscopy. By our detection method using SPR sensor, we achieved the limit of detection as 100 fg/ml and the SPR sensor showed a linear characteristic within the range of 100 pg/ml to 200 ng/ml.
김동준(Kim Dong-Jun),두화웨이(Du Huawei),장대호(Jang Dae-Ho),양희천(Yang Hei-Cheon) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
The behavior of air bubble to deliver oxygen to the water is critical for successful cleaning and water purification. The objective of this study is to investigate the behavior of micro bubbles which are generated by an ejector-bubble generator for development of cleaning technology. The visualization images of two phase jet issuing from the ejectorbubble generator are analyzed qualitatively. The mixed jet behaves like a buoyancy jet or horizontal jet owing to the momentum of primary water flow and air bubble size. It can be deduced that the higher the Re number and the lower the entrainment ratio, the smaller the air bubble size.