• 제목/요약/키워드: Mixing Factor

검색결과 471건 처리시간 0.031초

A CORRELATION FOR SINGLE PHASE TURBULENT MIXING IN SQUARE ROD ARRAYS UNDER HIGHLY TURBULENT CONDITIONS

  • Jeong, Hae-Yong;Ha, Kwi-Seok;Kwon, Young-Min;Chang, Won-Pyo;Lee, Yong-Bum
    • Nuclear Engineering and Technology
    • /
    • 제38권8호
    • /
    • pp.809-818
    • /
    • 2006
  • The existing experimental data related to the turbulent mixing factor in rod arrays is examined and a new definition of the turbulent mixing factor is introduced to take into account the turbulent mixing of fluids with various Prandtl numbers. The new definition of the mixing factor is based on the eddy diffusivity of energy. With this definition of the mixing factor, it was found that the geometrical parameter, ${\delta}_{ij}/D_h$ correlates the turbulent mixing data better than Sid, which has been used frequently in existing correlations. Based on the experimental data for a highly turbulent condition in square rod arrays, a correlation describing turbulent mixing dependent on the parameter ${\delta}_{ij}/D_h$ has been developed. The correlation is insensitive to the Re number and it takes into account the effect of the turbulent Prandtl number. The proposed correlation predicts a reasonable mixing even at a lower S/d ratio.

카본블랙의 혼합메카니즘에 관한 연구 (Mixing Mechanism of Carbon Black)

  • 김진국
    • Elastomers and Composites
    • /
    • 제26권4호
    • /
    • pp.287-295
    • /
    • 1991
  • The mixing process with carbon black is important in the rubber industries. However, it is difficult to characterize the mixing mechanism of the carbon black. The mixing mechanism(distributive mixing and dispersive mixing) was discribed in this paper. The effect of fill factor on the mixing of the carbon black was studied. The dispersive mixing ability increases with increasing fill factor. However, the distributive mixing ability decreases with increasing fill factor. The effect of the carbon black content on the rheological property of the material was studied in this paper. The viscosity of the material increases with increasing the carbon black content. However, the elasticity of the matarial decreases with the carbon black content.

  • PDF

플라이애시의 활성도지수 평가에 관한 기초적 연구 (Fundamental Study on Evaluation method of Activity Factor of Fly Ash)

  • 박상준
    • 한국건축시공학회지
    • /
    • 제8권5호
    • /
    • pp.59-65
    • /
    • 2008
  • In the evaluation method of KS on the activity factor of fly ash, same amount of cement should be replaced with fly ash. Therefore, contradictory effects on concrete strength exist, i. e. strength decease due to low content of cement and strength increase of strength due to filling-pore-function of fly ash. European Committee for Standardization (CEN) specifies the method 1 to 4. adding fly ash without reducing the content of cement, for the evaluation method on activity factor of fly ash. This study investigates the applicability of the method 2 of CEN to mix design of concrete. The followings are derived ; There is a key ratio of f)y ash mixing which enhances the incremental ratio of mixing water to improve fluidity of mortar. The incremental ratio of mixing water is maximized about 11% ratio of fly ash mixing. Compressive strength most slightly increases at that ratio of fly ash mixing. Activity factor of fly ash increases as water-cement ratio becomes low and contents of fly ash becomes high. Moreover, quality of fly ash and condition of mix design affect the applicable amount of fly ash and available range of water-cement ratio. However, this method has some problems for practical purpose because activity factors of fly ash for some cases are over 1.0. Further research should be conducted to develop more useful method of evaluating activity factor of fly ash.

콘크리트의 블리딩에 미치는 시멘트 및 믹싱시간의 영향 (Influence of Cement and Mixing time Factor on the Bleeding of Concrete)

  • 이원암;엄태선;이종열
    • 한국콘크리트학회:학술대회논문집
    • /
    • 한국콘크리트학회 2008년도 추계 학술발표회 제20권2호
    • /
    • pp.593-596
    • /
    • 2008
  • 콘크리트의 블리딩은 재료분리의 일종으로서 콘크리트 품질뿐만 아니라 내구성을 저하시키는 원인으로 작용한다. 본 연구에서는 콘크리트 블리딩에 영향을 미칠 것으로 예상되는 시멘트 및 믹싱시간의 두 요인의 변화에 따른 특성을 파악하여 블리딩 제어기술 확보를 위한 기초자료를 제공하고자 한다.연구결과에 의하면, 믹싱시간이 증가할수록 블리딩율도 증가하는 추세를 나타내고 있었다. 블리딩양(믹싱시간 90초)은 시멘트 특성에 의한 차이가 뚜렷하게 나타나고 있었으며, 콘크리트 특성값(블리딩율, 슬럼프 및 재령 3일 압축강도)은 믹싱시간과 비례적인 관계가 있었다. 또한, 슬럼프 손실율과 믹싱시간은 반비례적인 관계가 존재하였고, 압축강도값은 초기재령에서만 믹싱시간에 의한 영향을받고 있었다.향후, 최적 믹싱시간 도출을 위한 다양한 검토가 필요할 것으로 판단된다.

  • PDF

혼합계수(K-Factor) 증가에 따른 사업장의 환기 조건 및 효율 개선에 관한 연구 (An Experimental Study for the Improvement of Ventilation Conditions and Effectiveness in the Manufacturing Industry by Increasing the Mixing Factor (K-Factor))

  • 이윤호;이석원;이경호;김현욱
    • 한국산업보건학회지
    • /
    • 제29권3호
    • /
    • pp.343-350
    • /
    • 2019
  • Objectives: This study aims to identify whether ventilation conditions and their effectiveness can be significantly improved in an experimental chamber by increasing the mixing factor (K-Factor). Methods: In a chamber with a volume of $1m^3$, air velocity was measured at six different points with four roof fans in the upper part of the chamber being operated in order. The impact of the ventilation conditions was analyzed when the flow rates were increasing and the first inlet of the chamber was either open or closed. Smoke patterns were also observed at four corner points where ventilation was limited. Kruskal Wallis and Mann-Whitney tests were performed to compare air velocities measured in the chamber. Results: The air velocities measured at only the third point increased significantly from $0.03{\pm}0.03m/s$ (door open) and $0.05{\pm}0.06m/s$ (door closed) with two fans, $0.08{\pm}0.08m/s$ with three fans, and $0.09{\pm}0.09m/s$ with four fans operating (p<0.05). However, air velocities at the four corner points did not significantly increase. Smoke patters also showed that the open inlet of the chamber had no effect on improvement of ventilation conditions and effectiveness. Conclusions: In this study, the air velocities at six points in the chamber did not significantly increase despite the increase in the mixing factor and flow rates of ventilation in the controlled environment. Therefore, the inflow of outdoor air throughout an open inlet and installation of a forced ventilation system can potentially increase the indoor air velocity and improve ventilation condition without an increase in the mixing factor.

원자로 부수로내 혼합날개를 지나는 삼차원 열유동 해석 (Numerical Analyses of Three-Dimensional Thermo-fluid flow through Mixing Vane in A Subchannel of Nuclear Reactor)

  • 최상철;김광용
    • 대한기계학회논문집B
    • /
    • 제27권3호
    • /
    • pp.311-318
    • /
    • 2003
  • The present work evaluates the effects of mixing vane shape on the flow structure and heat transfer downstream of mixing vane in a subchannel of fuel assembly. by obtaining velocity and pressure fields. turbulent intensity. flow-mixing factors. heat transfer coefficient and friction factor using three-dimensional RANS analysis. Four different shapes of mixing vane. which were designed by the authors were tested to evaluate the performances in enhancing the heat transfer. Standard k-$\varepsilon$ model is used as a turbulence closure model. and. periodic and symmetry conditions are set as boundary conditions. The flow blockage ratio is kept constant. but the twist angle of mixing vane is changed. The results with three turbulence models were compared with experimental data.

액상 충돌 제트의 혼합에 대한 분사공 직경비의 영향 (Effect of Orifice Diameter Ratio on Unlike Impinging Jet Mixing)

  • 이성웅;조용호;유병일
    • 한국분무공학회지
    • /
    • 제11권4호
    • /
    • pp.220-227
    • /
    • 2006
  • Experimental studies has been conducted to investigate the effect of orifice diameter ratio on the mixing characteristics of the split element of doublet and triplet elements. The spray characteristics of non-reacting immiscible liquids have been investigated using a patternator. The local volume fraction is measured by use of mean value of each component. This volume measurement represents the mixing characteristics of the liquid, which affect the overall combustion efficiency. The ratio of the orifice diameter, ranging from 1 to 1.5, and that of the jet-momentum, ranging from 0.5 to 6.0, we used. The jet impinging behavior with use of various ratios exhibits substantially different mixing characteristics. Mixing efficiency is maximized when the jet-momentum ratio is increased; this behavior is particularly prominent when the orifice diameter ratio is greater than unity. The split of the triplet element yields better mixing characteristics and is more effective than that of the doublet element in regard to achieving high combustion efficiency. The optimum mixing factor for the triplet element is found to be 0.75, according to our measurement.

  • PDF

Pressure Drop in Motionless Mixers

  • Yang, Hei-Cheon;Park, Sang-Kyoo
    • Journal of Mechanical Science and Technology
    • /
    • 제18권3호
    • /
    • pp.526-532
    • /
    • 2004
  • A motionless mixer consists of a straight pipe or transfer tube containing the mixing elements that are used to cut, fold, twist, and re-combine the mixing fluid. The number of elements and their shape required in any application depend on the complexity of the mixing process. The objectives of this study are to develop new motionless mixers and to perform the experimental investigation of pressure drop in order to evaluate the performance of the new ones. Glycerin is used as a mixing fluid. Pressure drop is measured using a hydraulic manometer and correlations of friction factor are proposed as a function of Re. The friction factors of Sulzer SMX mixer are in qualitative good agreement with the published data. On the average, the friction factors of SSC and YNU mixers are about 36% lower than and 6% higher than that of the Sulzer one.

부순모래의 품질특성이 콘크리트의 배합인자 및 압축강도에 미치는 영향 (The Influence of the Properties of Crushed Stone Sand on the Mixing Factor and Compressive Strength of Concrete)

  • 홍지훈;염준환;최진만;정용;이성연;여병철
    • 한국콘크리트학회:학술대회논문집
    • /
    • 한국콘크리트학회 2005년도 추계 학술발표회 제17권2호
    • /
    • pp.623-626
    • /
    • 2005
  • This study is aimed for investigating the influence of the properties of crushed stone sand on the mixing factor and compressive strength of concrete. The results of this study are as follows; The influence of Particle Shape and Very Fine Sand(VFS) of crushed stone sand on the mixing factor was higher than Fineness Modulus. The demand water of concrete with crushed stone sand was decreased about $12\~18kg/m^3$with increasing $4\%$ of Particle Shape and increased $8\~15kg/m^3$ with increasing $3\%$ of ratio of Very Fine Sand(VFS).

  • PDF

스태틱 믹서의 압력손실에 대한 연구 (A Study for the Pressure Drop of Static Mixers)

  • 양희천;박상규
    • Journal of Advanced Marine Engineering and Technology
    • /
    • 제27권2호
    • /
    • pp.299-304
    • /
    • 2003
  • Static mixer consists of a straight pipe of circular cross section into which individual elements are inserted to cut, fold, twist and re-combine the mixing fluid. The number of elements and their shape required in any application depend on the complexity of the mixing process. The objectives of this study are to develop a new static mixer and to perform the experimental investigation of pressure drop in order to evaluate the performance of the new one. The mixing fluid used is Glycerin. The pressure drop is measured using a hydraulic manometer and the correlation of Z-factor is suggested as a function of Re. The Z-factors of SSC and YNU mixer are about 40% lower than and 4% higher than that of the Sulzer one.