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헬리컬 증기발생기 코일에서 강제대류 비등 열전달 및 유동의 수치적 예측
조종철(J C. Jo),김효정(H. J. Kim),김웅식(W. S. Kim),유선오(S. O. Yu) 한국전산유체공학회 2004 한국전산유체공학회 학술대회논문집 Vol.2004 No.-
In this study, three-dimensional numerical calculations are performed to simulate the flow and heat transfer in helically coiled tube steam generator employing a commercial CFD (Computational Fluid Dynamics) code. The problem considered herein includes the boiling phase change flow of tube side fluid and the single-phase counter-current flow of shell side hot fluid transferring heat to the tube side flow thru the tube wall. Detailed investigations are performed for both shell-side and tube-side flow fields in terms of density and volume fractions of each phase of fluids as well as for the tube wall heat transfer field in terms of heat transfer coefficients.
조종철(J.C. Jo) 한국전산유체공학회 2012 한국전산유체공학회 학술대회논문집 Vol.2012 No.11
This paper describes the phenomena and mechanism of Fluid-structure interaction (FSI), and provides the fundamental knowledge and information of the different two approaches for analyzing the FSI problems occurring in pressure vessels and piping systems. To do this, the author’s experience in both the one-way analysis of the flow-induced vibration of steam generator U-tubes and the two-way analysis of the flow-induced vibration of two parallel tubes subjected to external flow is introduced. For the applications of two-way coupled analysis approach to FSI problem of the two staggered parallel tubes vibrating in a cross flow field, three-dimensional FSI model using the coupled lattice Boltzmann method (LBM) and finite element method (FEM) is employed.
조종철(J. C. Jo),김웅식(W. S. Kim),김효정(H. J. Kim),이용감(Y. K. Lee) 한국전산유체공학회 2004 한국전산유체공학회 학술대회논문집 Vol.2004 No.-
This paper addresses a numerical simulation of the flow and heat transfer in a simplified model of helically coiled tube steam generator using a general purpose computational fluid dynamic analysis computer code. The steam generator model is comprised of a cylindrical shell and helically coiled tubes. A cold feed water entered the tubes is heated up, evaporates. and finally become a superheated steam with a large amount of heat transferred continuously from the hot compressed water at higher pressure flowing counter-currently through the shell side. For the calculation of tube side two-phase flow field formed by boiling, inhomogeneous two-fluid model is used. Both the internal and external turbulent flows are simulated using the standard k-e model. The conjugate heat transfer analysis method is employed to calculate the conduction in the tube wall with finite thickness and the convections in the internal and external fluids simultaneously so as to match the fluid-wall-fluid interface conditions properly. The numerical calculations are performed for helically coiled tubes of steam generator at an integral type pressurized water reactor under normal operation. The effects of tube-side inlet flow velocity are discussed in details. The results of present numerical simulation are considered to be physically plausible based on the data and knowledge from previous experimental and numerical studies where available.
가압경수로 주증기관 파단시 증기발생기 2차측 과도 열수력 응답에 미치는 오리피스형 유량제한기의 영향
조종철(J.C. Jo),민복기(B.K. Min) 한국전산유체공학회 2014 한국전산유체공학회 학술대회논문집 Vol.2014 No.11
In this study, a numerical analysis was performed to simulate the thermal-hydraulic response of the secondary side of a steam generator (SG) model equipped with an orifice-type SG outlet flow restrictor to a main steam line break (MSLB) at a pressurized water reactor (PWR) plant. The SG analysis model includes the SG upper steam space and the part of the main steam pipe between the SG outlet and the broken pipe end. By comparing the numerical calculation results for the present SG model to those obtained for a simple SG model having no flow restrictor, the effects of the flow restrictor on the thermal-hydraulic response of SG to the MSLB were investigated.
가압경수로 주증기관 파단시 증기발생기 2차측 과도 열수력 응답에 미치는 오리피스형 유량제한기의 영향
조종철(J.C. Jo),민복기(B.K. Min) 한국전산유체공학회 2015 한국전산유체공학회지 Vol.20 No.3
In this study, a numerical analysis was performed to simulate the thermal-hydraulic response of the secondary side of a steam generator(SG) model equipped with an orifice-type SG outlet flow restrictor to a main steam line break(MSLB) at a pressurized water reactor(PWR) plant. The SG analysis model includes the SG upper steam space and the part of the main steam pipe between the SG outlet and the broken pipe end. By comparing the numerical calculation results for the present SG model to those obtained for a simple SG model having no flow restrictor, the effects of the flow restrictor on the thermal-hydraulic response of SG to the MSLB were investigated.
조종철(J. C. Jo),김흥건(H. G. Kim),조진호(J. H. Cho) 한국자동차공학회 1986 오토저널 Vol.8 No.3
열교환기의 확장 표면이 2가지 또는 3가지의 서로 다른 재질들로써 구성되는 경우, 직선 및 환상의 Composite Fin Assembly에서 구성 재질들의 열전도율들이 각 Assembly에서의 온도 분포와 열유동량에 미치는 영향을 조사하였다.<br/> Composite Fin Assembly에서의 온도 분포를 구하기 위하여 유한 요소법을 사용하여 수치 계산하였다.<br/> Composite Fin Assembly를 구성하는 재료들의 열전도율들이 열유동량에 미치는 효과는 상당히 크며, 따라서 확장 표면의 설계 계산에 있어서 이러한 효과들을 필수적으로 고려하여야 함이 밝혀졌다.<br/>
[論文] Fin Assembly에서의 2次元 熱傳達 解析
서정일(J.I.Seoh),조진호(J.H.Cho),조종철(J.C.Jo),강희영(H.Y.Kang) 한국자동차공학회 1984 오토저널 Vol.6 No.1
<br/> The conventional heat transfer analysis methods based on the one-dimensional theory are not adequate to be applied for the purpose of finned surface design because the two-dimensional<br/> effects in fact are induced within the supporting wall by the presence of the finnes.<br/> In this study, the two-dimensional heat transfer of a straight fin assembly is analyzed by using the integral method.<br/> It is shown that all the effects of the system parameters i.e., the heat transfer parameters and geometrical parameters, on both the total heat transfer rate and the surface temper<br/> ature effectiveness can be seen from the present analysis. The optimum combinations of these parameters for the design of finned surfaces may be estimated.
고압의 포화수증기-비응축성 수소기체 혼합기 속에서 분무수적으로의 열전달을 예측
이상균,조종철,조진호,Lee, S.K.,Jo, J.C.,Cho, J.H. 대한설비공학회 1991 설비공학 논문집 Vol.3 No.5
Heat and mass transfer rates to spray water droplets for spray transients in a high pressure vessel have been predicted by two different droplet models: the complete mixing model and the non-mixing model. In this process, the ambient fluid surrounding the droplets is a real-gas mixture composed of saturated steam and noncondensable hydrogen gas at high pressure. The physical properties of the mixture are estimated by applying the concept of compressibility factor and using appropriate correlations. A computer program, DROPHMT, to calculate the heat and mass transfer rates for two different droplet models has been developed. As an illustrative application of the computer program to engineering practices, heat and mass transfer rates to spray water droplets for spray transients in a Pressurized Water Reactor (PWR) pressurizer have been calculated, and the typical results have been provided.