초록

In this study, the CFD analysis was performed by changing the geometry of coil-tube diameter ratio, coil winding number, coil pitch, and cross section of the tube to investigate the heat flow characteristics of forced convection in a helical coil-tube heat exchanger using RSM (Reynolds Stress Model). As a result, thesecondary flow was developed in the tube caused by the influence of centrifugal force. It improved the heat transfer on the outer side of the tube, but on the inner side was not performed well. And the temperature rose locally in the tube region. Also the pressure drop in the tube was proportional to the diameter ratio of the coil-tube and the inlet velocity, and it was found that pressure drop and friction factor were inversely proportional. When the coil winding number and coil pitch were increased, it affected heat transfer in the low speed range of 0.1 ~ 0.2 m/s, but did not affect the flow condition after this range.

키워드

Helical Tube Heat Exchanger(나선형 튜브 열교환기), Forced Convection(강제대류), Heat Flow(열유동), Secondary flow(2차유동), CFD(전산유체역학), RSM(레이놀즈응력모델)

참고문헌(10)open

  1. [학술지] W. R. Dean / 1927 / Note on the motion of fluid in a curved pipe / Philosophical Magazine 4 (20) : 208 ~ 223

  2. [학술지] R. A. Seban / 1963 / Heat transfer in tube coils with laminar and turbulent flow / International Journal of Heat and Mass Transfer 6 (5) : 387 ~ 395

  3. [단행본] J. S. Jakakumar / 2012 / Heat Exchangers - Basic Design Application / InTech : 311 ~ 342

  4. [학위논문] P. Jhunjhunwala / 2013 / CFD analysis of helically coiled tube for compact heat exchangers

  5. [학술지] S. Ali / 2001 / Pressure drop correlations for flow through regular helical coil tubes / Fluid Dynamic Research 28 (4) : 295 ~ 310

  6. [학술지] M. H. Seyyedvalilu / 2015 / The effect of Geometrical parameters on heat transfer and hydro dynamical characteristics of helical exchangers / IJMEC 4 (1) : 35 ~ 46

  7. [학술대회] S. W. Kim / 1999 / Numerical simulation of flows and heat transfer characteristics in spiral tube exchanger / SAREK Summer Conference Proceeding : 1169 ~ 1176

  8. [학술지] 윤동혁 / 2012 / 나선형 튜브내의 난류 열전달에 대한 수치적 연구 / 대한기계학회논문집 B 36 (8) : 783 ~ 789

  9. [학술지] 곽승현 / 2013 / 열교환기의 나선형 관내 난류유동 수치해석 / 한국마린엔지니어링학회지 37 (8) : 905 ~ 910

  10. [학술지] 진정정 / 2016 / 각도형상에 따른 정사각형 곡관에서 출구면 및 하류직관거리의 속도분포특성에 관한 연구 / 한국기계기술학회지 18 (3) : 382 ~ 390