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Draw Resonance 이론의 재조명
A Refocus on the Draw Resonance Theory
HWAHAK KONGHAK, August 1989, 27(4), 556-560(5), NONE
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Abstract
본 논문의 저자 중의 하나가 발표했던 Draw Resonance 이론을 수치해석적 방법으로 다시 연구해 본 결과, 용융방사에서 생기는 불안정성인 Draw Resonance를 설명하는, 원래 제안했던, Waves 의 전파시간을 기초로 한 역학적 관계식이 옳다는 것이 밝혀졌다. 또한 Draw Resonance 조건식에 두 개의 전파시간, 즉 Throughput Waves의 전파시간과 유체 입자의 전파시간[Threadline(薩線)의 속력에 근거한 시간]이외에 주기적으로 변하는 사선의 힘과 단면적인 위 상차(시간차)를 포함시켜야 함도 아울러 밝혀졌다. 간단한 Newtonian 유체를 Model로 해서, 수정된 Draw Resonance식을 푼 결과, 임계연신비 rc의 값이 20.21로 나와서 다른 연구자들의 결과(전파시간 개념을 쓰지 않는 단순한 수치모사 계산)와 같게 되었다.
The draw resonance theory published by one of the present authors, has been numerically restudied to confirm the correctness of the originally proposed kinematics(based on the concept of the waves traveling times)for the onset of draw resonance instability in melt spinning. It also has been found that the draw resonance criterion should include not only the two traveling times, i.e., the throughput wave traveling time and the fluid element travel-ing time(based on the threadline velocity), but also the phase difference(time difference)between the fluctuations of the threadline force and the threadline cross-sectional area. Using the simple model of Newtonian fluids into the revis-ed draw resonance criterion, we have got the value of 20.21, for γC(critical draw ratio at the onset of draw resonance), which is the same value obtained by other researchers who employed direct numerical simulation methods without the concept of kinematics of the traveling waves.