유체역학적, 물리전달의 원리 측면에서 이 현상을 고찰해 보려고 한다. 사실 휘젓기 때문에 생기는 turbulence는 random motion을 일으켜 커피 잔 안에서 움직이는 분자들의 움직임을 모두 예상하여 결론을 내리기는 어렵지만 거시적인 관점에서 유체의 흐름과 그 흐름으로 인한 물질 전달 흐름의 변화에 관해
fluid system due to eddy motion
- Any particle of the fluid undergoes a series of random movements, superimposed on the main flow. These eddy movements bring about mixing throughout the turbulent core. This process is often referred to as "eddy diffusion." The value of the eddy-mass diffusivity will be very much larger than the molecular diffusivity in the turbulent core.
2. Fluid dynamics
-
correction factor,
일반적으로 { }-0.5 의 값은 pitot coefficient 로 주어진다.
비압축성 유체의 경우에는 Ma 의 보정인자가 1이므로
--------------------------------------(2-16)
pitot tube 에서는 국부속도가 측정되므로 다시 평균유속으로 산출해야하는 불편함이 있다. 그러나 굴뚝같은 직경이 큰 유로에서 효과적이다.
1. 300개의 velocity field data를 time-averaging 하여 이를 vector 표시로 plot하라.
실험에서 주어진 원래의 데이터를 Matlab을 이용하여 time-averaging 하여 저장하였다. 그 후 Tecplot에서 불러들인 다음 각 격자를 2×2로 나눈 후 interpolation하고 나눈 격자를 다시 2×2로 나누어 interpolation 하였다. 같은 방법으로 두 번
(worldwide): 434,246
At interbrand survey, brand value ranked second in the world(2011)
2. IBM Mission
Their value at work.
Dedication to every client's success.
• Passionate about building strong, long-lasting client relationships. .
• Focused on outcomes. IBM sell products, services and solutions to help our clients succeed, however they measure success.
1. Introduction of NVP-BEZ235
NVP-BEZ235 소개
Novartis
스위스 바젤에 본사를 두고있는 다국적 제약회사로 세계
각지에서 연구소를 운영중
1996년, 스위스에서 가장 큰 두 개의 제약·의료업체인
시바 가이기(Ciba-Geigy)와 산도즈(Sandoz)의 합병을
통해 설립
2010년 기준 총 매출액 세계 2위(506억 US $)
2010년
1. Smart Bedroom_ smart wall
Smart Wall
What :
Customized room environment
Visual, audio settings
Interaction with the user
What :
Customized room environment
Visual, audio settings
Interaction with the user
2. Smart Kitchen_ refrigerator
RFID technology
● Definition :
a technology to electronically record the presence of an object using radio signals
● Application :
Worker’s Party had held
the lead throughout the year. Many foreign investors felt nervous because Lula showed very
strong left-leaning position previously. It accelerated outflow of capital overseas and became a chief
factor of a speedy rising of exchange rate. In addition, Brazil suffered from an electric power
shortage because of the severe drought
per hour. However, these respirators are capable to remain the flow ‘laminar’ that passes through their gill slits. These abilities to remain ‘laminar’ are explained throughout this paper and it will be shown by the case of a Skipjack Tuna. Equations that are developed from the basic interflow of fluid dynamics are also used for the rectangular tube figure of secondary lamellae.
potential,
begin to exchange ions
this makes maximum strain limit
Advantages of CNT as an actuator
- High output stress (work)
- Actuatable at high temperature (> 100℃ - ionic liquid)
- Double layer charge effect
long life-cycle (than conducting polymer)
Disadvantage
Low electrochemical strain (< 1%)
(than conducting polymer – polypyrrole 26%)