화학공학 실험 중 `관 부속품에 따른 압력 강하 측정` 예비 / 결과레포트입니다. 자세한 실험 결과를 토대로 책에 나와있는 각종 문제를 상세한 설명과 함께 풀이하였습니다. 한 문제도 빠트리지 않고 정확한 데이터와 함께 문제를 풀었습니다. 이 레포트만 있다면 `관 부속품에 따른 압력 강하 측정` 예비 및 결과 레포트는 완벽하게 작성할 것입니다. 또한, 레포트의 마지막에 토의 내용도 있기 때문에 레포트 작성이 더욱 수월할 것이라 생각됩니다.
2. Continuity Equation. (Steady-state mass balance for fluid flow)
A particularly useful and simple mass balance which is also known as the continuity equation can be derived for the situation in Figure 1. where the system resembles a wind sock at an airport. A station 1. fluid flows steadily with density ρ1 and a uniform velocity u1(In our text book, u1=V1) normally across that part of the surface of the system represented by the area A1. In steady flow, each fluid particle traces a path called a streamline. By considering a large number of particles crossing the closed curve C, we have an equally large number of streamlines that then form a surface known as a stream tube, across which there is clearly no flow. The fluid then leaves the system with uniform velocity u2 and density ρ2 at station 2, where the area normal to the direction of flow is A2.
Referring to Equation 1. there is no accumulation of mass because the system is at steady state. Therefore, the only nonzero terms are m1 (the rate of addition of mass) and m2(the rate of removal of mass), which are equal to ρ1A1u1 and ρ1A1u1, respectively, so that equation 1.1 becomes
This is can be rewritten as
where m(= m1 = m2) is the mass flow rate entering and leaving the system.
- Fluid Mechanics for Chemical Engineers, p56~123 Second edition, by James O.Wilkes
- Chemical Engineering Laboratory Ⅱ, p13~16 SungKyunKwan Univ. chemical Engineering.
- Unit operation of Chemical Engineering, p121~123, McCabe, smith, Harriot