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송태호,오진국,윤창현,허경재,Song Tae Ho,Oh Jin Kook,Yoon Chang Hyun,Huh Gyoung Jae 대한설비공학회 1981 설비저널 Vol.10 No.4
Optimal design of shell and tube heat exchanger system with the working fluids which may condense outside the tubes has been carried out under specified inlet and outlet conditions. Independent variables such as number of parallel series, tube diameter, distribution pitch, tube side pressure loss, baffle cut and shell side pressure loss as well as dependent variables such as shell diameter, number of tubes, number of serial series and number of baffles were all characterized according to the standard. Exhaustive search method was used to construct a computer program together with the calculation of heat transfer rate by LMTD method. stress analysis of maj or parts was made to examine their dimensions satisfying heat transfer and pressure loss requirements. Cost estimation based on the installation, operation and maintenance was also made, A few representative variables, heat transfer area, shell diameter and pressure loss, were used to express cost function, finally giving the optimal selection of all tentative solutions.
허경재 釜山大學校生産技術硏究所 1999 生産技術硏究所論文集 Vol.56 No.-
구와 평판의 수직 충돌 해석에서 공간 영역과 시간 영역의 유한 요소법을 이용하여 수치 해석 하였다. 접촉면은 비접착 접촉이고, 마찰은 없다고 가정한다. 접촉면의 기하학적 적합 조건인 접촉 조건을 제한 조건으로 하는 변분 수식을 도입하였다. 구와 평판을 유한 요소화하고, 기하학적 적합 조건을 적용하기 위해 Lagrange 승수가 사용되었다. 접촉 여부 조사는 접촉면의 유한 요소 절점에서 시행하고, 시간 영역에서는 한 시간 요소의 마지막 시간 절점에서 조사하였다. 구와 평판의 수직 충돌 문제의 접촉 기간에서 Hertz의 결과에 접근하는 수치 해석 결과를 얻었다. Space-time finite element methods are applied to the transverse impact analysis between sphere and plate. The contact surface is assumed unbonded and frictionless. A variational statement constrained by the geometric compatibility condition on the contact surface is adopted. The sphere and plate are discretized by the finite element method. The Lagrange multiplier technique is employed to impose the geometric compatibility condition of contact. For numerical implementation, several contact check points are selected conventiently at nodal points on the contact surface. In the time domain, the time point to check the contact condition is chosen at the final time of a time step. The obtained duration of impact shows good sgreement with that of the Hertz's solution.