A5054311929- Material Dynamics and Properties
- Heat and Mass Transfer in Porous Media
- Rheology and Fluid Dynamics Studies
- Electrostatics and Colloid Interactions
- Lattice Boltzmann Simulation Studies
- Coagulation and Flocculation Studies
- Aerosol Filtration and Electrostatic Precipitation
- Theoretical and Computational Physics
- Granular flow and fluidized beds
- Surfactants and Colloidal Systems
- Composite Material Mechanics
- Radioactivity and Radon Measurements
- Gold and Silver Nanoparticles Synthesis and Applications
- Nanomaterials for catalytic reactions
- Pickering emulsions and particle stabilization
- Carbon Nanotubes in Composites
- Nanopore and Nanochannel Transport Studies
- Particle Dynamics in Fluid Flows
- Nanotechnology research and applications
- Rock Mechanics and Modeling
- Electromagnetic Scattering and Analysis
- Polymer Foaming and Composites
- Fluid Dynamics and Heat Transfer
- Soil and Unsaturated Flow
- Characterization and Applications of Magnetic Nanoparticles
Sangmyung University
2009-2023
LG (South Korea)
2005-2006
LG Chem (South Korea)
2005-2006
Syracuse University
2001-2005
City University of Hong Kong
2000
We consider the problem of predicting rate mass transfer to a fluid flowing parallel axes randomly placed aligned tubes, model hollow-fibre contactors. The analysis is carried out for limiting cases short contactors, which concentration boundary layers remain thin compared with radius and fully developed case corresponding very long tubes. Numerical simulations random arrays are increased. This behaviour arises due logarithmically divergent nature disturbances caused by each tube in plane...
Effective-medium theories for predicting conditionally averaged velocity field and hydrodynamic transport coefficients of monodisperse suspensions are extended to bidisperse suspensions. The predictions the theory shown agree very well with results direct numerical simulations hard-sphere configurations up volume fractions at which phase separation in systems observed.
Radon is a radioactive gas that can be generated from concrete. Its concentration enhanced in indoor environments, and tracheobronchial deposition of radon progeny lead to lung cancers. Aggregates (granite) are known the source Recently, silica fume introduced as partial substitution Portland cement produce high-strength It set aggregate−cement paste interface lower porosity zone. also effectively fill up voids between grains, which suggests its ability retard emission concrete aggregates....
본 연구에서는 크기가 다른 두 종류의 단단한 구형 입자들로 충전된 이분산(二分散) 충전층을 지나는 비압축성 유체 흐름의 투과도를 실험적으로 측정하고 이론적으로 예측하는 문제를 다룬다. 작은 입자에 대한 큰 입자의 크기 비 <TEX>${\lambda}$</TEX>가 1.25와 2인 가지 경우에 대해 여러 입자 혼합 비율로 만들고 그 공극률과 측정하였다. 이분산 충전은 일정한 단분산 충전에 비해 공극률이 감소하고 투과율이 감소하나 입자들의 <TEX>${\lambda}$</TEX>나 비율 <TEX>${\gamma}$</TEX>에 따라 다르게 나타난다. 비율에 따른 공극률의 변화와 투과율의 변화 형태는 서로 일치하지 않는다. 개별 충전 걸리는 항력 계산에 기초한 모델을 고안하여 간단한 이론식을 유도하였고 이 식을 이용한 예측값을 실험 결과 및 선행 연구 결과들과 비교한 결과, 이론식에 의한 투과도 예측값이나 경향이 실험값에 가장 근사하였다. 이용해 간단하고 정확하게 예측할 수 있음을...
Light-weight concrete (LWC) (or drywall construction) has been used for partition walls in public housing Hong Kong about 10 years. A previous laboratory investigation showed that all types of LWC had considerably smaller Rn exhalation rates than those from normal (NC), and could thus theoretically reduce the indoor concentrations corresponding radiation dose Rn. In present investigation, a survey at 39 dwelling sites built using were carried out charcoal canisters ?-spectroscopy. The mean...
A countercurrent gas–liquid flow through a fixed bed of spherical particles is examined numerically by solving the particle-scale equations governing gas and liquid flows. The assumed to along surface forming thin film. case small rates in detail first. In this limit presence film increases pressure drop over its value for dry three mechanisms: makes apparent size larger, decreases pore space flow, and, with velocity pointing opposite mean compared particle surface. excess determined both...