• Title/Summary/Keyword: liquid analyzer

Search Result 211, Processing Time 0.04 seconds

Flow visualization and spray characteristics of twin-fluid atomization with converging-diverging nozzles (축소확대 노즐에 의한 2유체 미립화의 유동가시화 및 분무특성)

  • Park, Byeong-Gyu;Lee, Jun-Sik
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.21 no.8
    • /
    • pp.1056-1067
    • /
    • 1997
  • Present study visualized flow pattern and investigated spray characteristics of twin-fluid atomization with converging-diverging nozzles. Particle sizes were measured by using the Malvern particle analyzer, and the radial size distributions were evaluated by using the tomographic transform technique. The results show that the SMD generally increases in the radial direction at a prescribed liquid flow rate and the increasing rate in the SMD becomes gradual as atomizing gas pressure increases. The SMD decreases as the liquid flow rate increases at a fixed GLR (gas/liquid mass ratio). The atomization performance of the protrusion-type nozzle turned out to be superior to that of the flush-type. However, in the case of the protrusion-type, flow separation occurs outside the liquid delivery tube when the pressure at the gas nozzle chamber is high enough, which may deteriorate the atomization performance.

A Study on Catalytic Pyrolysis of Polypropylene with Mn/sand (Mn/sand 촉매를 활용한 폴리프로필렌 촉매 열분해 연구)

  • Soo Hyun Kim;Seung Hun Baek;Roosse Lee;Sang Jun Park;Jung Min Sohn
    • Clean Technology
    • /
    • v.29 no.3
    • /
    • pp.185-192
    • /
    • 2023
  • This study was conducted to obtain basic process simulation data before conducting pyrolysis experiments for the development of a thermochemical conversion system by recirculation of heat carrier and gases thereby. In this study, polypropylene (PP) was used as a pyrolysis sample material as an alternative to waste plastics, and fluid sand was used as a heat transfer medium in the system. Manganese (Mn) was chosen as the catalyst for the pyrolysis experiment, and the catalyst pyrolysis was performed by impregnating it in the sand. The basic properties of PP were analyzed using a thermogravimetric analyzer (TGA), and liquid oil was generated through catalytic pyrolysis under a nitrogen atmosphere at 600℃. The carbon number distribution of the generated liquid oil was confirmed by GC/MS analysis. In this study, the effects of the presence and the amount of Mn loading on the yield of liquid oil and the distribution of hydrocarbons in the oil were investigated. When Mn/sand was used, the residue decreased and the oil yield increased compared to pyrolysis using sand alone. In addition, as the Mn loading increased, the ratio of C6~C9 range gasoline in the liquid oil gradually increased, and the distribution of diesel and heavy oil with more carbon atoms than C10 in the oil decreased. In conclusion, it was found that using Mn as a catalyst and changing the amount of Mn could increase the yield of liquid oil and increase the gasoline ratio in the product.

Characteristics of composite membranes containing ionic liquid and acid for anhydrous high temperature PEFCs (무가습 고온 PEFC용 이온성 액체 및 산이 함유된 복합막의 특성)

  • Baek, Ji-Suk;Park, Jin-Soo;Park, Seung-Hee;Yang, Tae-Hyun;Park, Gu-Gon;Yim, Sung-Dae;Kim, Chang-Soo;Shul, Young-Gun
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 2009.06a
    • /
    • pp.378-378
    • /
    • 2009
  • The ionic liquid-based sulfonated hydrocarbon composite membranes was prepared for use in anhydrous high temperature-polymer electrolyte fuel cells (HT-PEFCs). Ionic liquid behaves like water in the composite membranes under anhydrous condition. However the composite membranes show a low conductivity and high gas permeability as the content of ionic liquid increases due to its high viscosity and content of ionic liquid, respectively. Hence, in order to enhance the proton conductivity and to reduce the gas permeability of the composite membranes with low content of ionic liquids, the acid containing a common ion of ionic liquid was added to the composite membranes. The characterization of composite membranes was carried out using small-angle X-ray scattering (SAXS), thermogravimetric analyzer (TGA) and impedance spectroscopy. As a result, the composite membranes containing acid showed higher proton conductivity than those with no acid under the un-humidified condition due to a decrease in viscosity. In addition, the proton conductivity of composite membranes increased with increasing mole concentration of acid.

  • PDF

A Study on Fabrication of Fluidic Devices using Stereolithography Technology (Stereolithography 기술을 이용한 유체소자 제작에 관한 연구)

  • Lee Young Tae;Bae Yong Hwan
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.21 no.10
    • /
    • pp.188-195
    • /
    • 2004
  • In this paper, we fabricated fluidic devices like micro-channel, pump, mixer and particular gas separator with the technology of stereolithouaphy using RP(rapid-prototyping). The fabricated fluidic devices are expected to be applied to develop Lab-on-a chip type liquid analyzer. Stereolithography technology seems effective for fabricating MEMS(Micro Electro Mechanical System) with complicated structure because it makes three dimensional fabrication possible but, exclusive devices are needed to be developed fur fabricating even more microscopic MEMS structure.

Tomographic Reconstruction of Asymmertic Liquid Spray from Multi-angular Scanning (다각주사법에 대한 비대칭 분무 구조의 토모그래피 재구성)

  • 이충훈;정석호
    • Transactions of the Korean Society of Automotive Engineers
    • /
    • v.4 no.1
    • /
    • pp.177-186
    • /
    • 1996
  • A convolution alogorithm combined with Fourier transformation is applied to the tomographic reconstruction of the asymmetric spray structure to identify the local drop size and volume concentration. The line of sight intergrated data from Malvern particle analyzer with multiangular scanning form a basic information for the deconvolution. Linear interpolation is tested to obtain the effect of increasing number of scanning angles. This transformation method predicts well the structure of asymmetric spray. The tehnique can be extended to other line of sight combustion diagnostics.

  • PDF

Study on Measurement Errors due to Attenuation in Plannar Image technique (평면 이미지 기법에서 감쇠로 인한 측정 오차에 대한 연구)

  • Jeon, J.Y.;Kim, D.J.;Koh, H.S.;Yoon, Y.B.
    • Journal of ILASS-Korea
    • /
    • v.7 no.3
    • /
    • pp.24-30
    • /
    • 2002
  • In the analysis of the mass distribution and SMD(Sauter Mean Diameter), planar laser imaging technique is a convenient and useful one when compared to the mechanical pattemator or PDPA (Phase Doppler Particle Analyzer). But recorded signals at cameras and intensity of laser are distorted by attenuation. Using experimental datum and assumptions, we study measurement errors due to attenuation in plannar image technique.

  • PDF

Modeling of an Once Through Helical Coil Steam Generator of a Superheated Cycle for Sizing Analysis

  • Kim, Yeon-Sik;Sim, Yoon-Sub;Kim, Eui-Kwang
    • Proceedings of the Korean Nuclear Society Conference
    • /
    • 1997.10a
    • /
    • pp.558-563
    • /
    • 1997
  • A thermal sizing code, named as HSGSA (Helical coil Steam Generator Sizing Analyzer), for a sodium heated helical coil steam generator is developed for KALIMER (Korea Advanced LIquid MEtal Reactor) design. The theoretical modeling of the shell and tube sides is described and relevant correlations are presented. For assessment of HSGSA, a reference plant design case is compared to the calculational outputs from HSGSA simulation.

  • PDF

Microfluidic Components and Bio-reactors for Miniaturized Bio-chip Applications

  • Euisik Yoon;Yun, Kwang-Seok
    • Biotechnology and Bioprocess Engineering:BBE
    • /
    • v.9 no.2
    • /
    • pp.86-92
    • /
    • 2004
  • In this paper miniaturized disposable micro/nanofluidic components applicable to bio chip, chemical analyzer and biomedical monitoring system, such as blood analysis, micro dosing system and cell experiment, etc are reported. This system includes various microfluidic components including a micropump, micromixer, DNA purification chip and single-cell assay chip. For low voltage and low power operation, a surface tension-driven micropump is presented, as well as a micromixer, which was implemented using MEMS technology, for efficient liquid mixing is also introduced. As bio-reactors, DNA purification and single-cell assay devices, for the extraction of pure DNA from liquid mixture or blood and for cellular engineering or high-throughput screening, respectively, are presented.

Size Measurements of Droplets Entrained in a Stagnant Bubbling Liquid Column

  • Jeong, Hae-Yong;No, Hee-Cheon;Song, Chul-Hwa;Chung, Moon-Ki
    • Proceedings of the Korean Nuclear Society Conference
    • /
    • 1996.11a
    • /
    • pp.254-259
    • /
    • 1996
  • Phase Doppler particle analyze. (PDPA) is a instrument which can be used to obtain simultaneous size and velocity measurements in a multiphase flow. In this study, the size of the water droplets entrained from a bubbling surface of a stagnant liquid column is measured by PDPA with a specially designed transmitter of long focal length and large beam diameter. The test section tube is made of acryle with 18 mm I.D. and 900 mm length. The experimental data are obtained for the air superficial velocity between 0.7 m/s to 3.4 m/s at atmospheric pressure. The experimental results show that there exists large difference in the entrainment mechanism between the churn-turbulent flow and annular flow. Through the present study, the phase Doppler analyzer system is shown to be successfully applied to measure particle sizes larger than $2,000\mu\textrm{m}$ if a transmitter of long focal length is utilized.

  • PDF

A Relationship between Partial Discharge and Radiated Electromagnetic Waves in Liquid Nitrogen (대기압하의 액체질소중 부분방전과 방사전자파의 상호관계)

  • Park, Kwang-Seo;Shin, Ho-Young;Kim, Chung-Nying;Kim, Ki-Chai;Park, Won-Zoo;Lee, Kwang-Sik;Lee, Dong-In
    • Proceedings of the KIEE Conference
    • /
    • 1998.11c
    • /
    • pp.956-958
    • /
    • 1998
  • In this study, a relationship between partial discharge and the radiated electromagnetic waves is investigated by measuring electromagnetic waves using a biconical antenna and a spectrum analyzer. The patterns of frequency spectrum of radiated electromagnetic waves measured at the atmospheric pressure in Liquid Nitrogen($LN_2$) during the partial discharges in nonuniform electric field depend on positive DC power. From these points of view. it is considered that these results obtained from this investigation may be used as fundamental data for diagnosis and prediction of insulation on the equipments of superconducting and cryogenic applications.

  • PDF