CFD 해석을 통한 Plain형 핀-튜브 열교환기의 열전달 및 압력강하특성에 관한 연구
A study on heat transfer and pressure drop characteristics of plain fin-tube heat exchanger using CFD analysis
1
조회
0
다운로드
5
인용
0
참고문헌
키워드
초록
핀-튜브 열교환기는 산업용 보일러, 라디에이터, 냉동기 등에 많이 사용되고 있어 열교환기의 성능향상을 위한 다양한 연구가 진행되고 있다. 본 연구에서는 Plain형 핀-튜브 열교환기에 대해 가로피치,와류발생기위치, 튜브표면의 돌기형상 및 돌기개수 등의 변화에 따른 열전달 및 압력강하 특성을 이론적으로 해석하였다. CFD 해석시 경계조건으로는 SST 난류모델을 적용하였으며, 튜브표면의 온도는 333K이고, 입구측 공기의 온도와 속도는 423~438 K, 1.5~2.1 m/s로 가정하였다. 해석결과로는 열전달계수는가로피치에 대한 영향은 큰 차이가 없으며, 열전달특성은 와류발생기 설치가 튜브 전방부에 위치할수록양호한 것으로 나타났다. 또한 튜브표면의 돌기형상은 열전달 및 압력강하 특성에서 원형이 톱니형과삼각형보다 적절하였으며, 16개 원형 돌기형상이 가장 양호하였다.
Abstract
The fin-tube heat exchanger being used for industrial boiler, radiator, refrigerator has been conductedin various studies to improve it’s performance. In this study, the characteristics of heat transfer and pressuredrop was theoretically analyzed according to longitudinal pitch, location of vortex generator, bump phase andnumber of the tube surface about the plain fin-tube heat exchanger. The boundary condition for the CFD(Computational Fluid Dynamics) analysis applied with the SST (Shear Stress Transport) turbulence model assumedas the tube surface temperature of 333 K, the inlet air temperature of 423-438 K and the inlet air velocityof 1.5~2.1 m/s. The analysis results indicated that the heat transfer coefficient is not affected highly bythe longitudinal pitch, and the heat transfer characteristics was more favorable when the vortex generator waslocated in front of the tube. Also the bump phase of the tube surface indicated that circle type was more appropriatethan serrated type and triangle type in the characteristics of heat transfer and pressure drop, and thesixteen’s bump phase of circle type was most favorable.
참고문헌 (12)
- J. D. Lee, "Research review for parametric characteristics on heat ex-changer", Transactions of the Korean Society of Mechanical Engineers, 33(1), pp.936~941 (1993)
- J. W. Yun, "Numerical study on the characteristics of flow an heat transfer in finned tube heat ex-changer", Transactions of the Society of Air-Conditioning and Refrigeration Engineers, 25(2), pp.137~150 (1996)
- H. C. Kang, "Fin efficiency of the heat ex-changer", Transactions of the Society of Air-Conditioning and Refrigeration Engineers, pp.1151~1121 (1999)
- M. K. Lee, "Development on new fin of fin-tube heat exchanger for A", C system, 2002, 153~158
- J. H. Lee, "Forced convection characteristics of V type circular-finned tube heat exchanger", Proceeding of the Society of Air-Conditioning and Refrigeration Engineers, pp.1348~1354 (2009)
- N. H. Kim, "Heat transfer and friction correlations for plain fin and tube heat exchangers", Proceedings of 11th The 11th International Heat Transfer Conference, 6, pp.209~213 (1998)
- 김내현, "Heat Transfer and Pressure Drop Characteristics of Plain Finned Heat Exchangers Having 5.0 mm Tubes", International Journal of Air-Conditioning and Refrigeration, 16(1), pp.9~14 (2008), 대한설비공학회
- H. S. Chang, "Study on performance of plate fin-oval tube heat exchanger with vortex generators", Proceedings of the Korean Society of Mechanical Engineers, pp.345~350 (2005)
- D. H. Jin, "Study on the heat transfer and pressure drop characteristics in the plain fin heat ex-changers with round tube", Proceeding of the Society of Air-Conditioning and Refrigeration Engineers, pp.306~309 (1999)
- J. H. Maeng, "Performance test of the heat ex-changer in the shape of fins for waste gas heat recovery", Proceeding of the Society of Air-Conditioning and Refrigeration Engineers, 6, pp.1247~1252 (2010)
- S. N. Lee, "Heat transfer prediction in pipe flow by the wall function of SST turbulence model", Preceeding of the Korean Society for Computational Fluids Engineering, pp.355~358 (2013)
- M. M. El-Gendi, "On the Significance of Turbulence Models and Unsteady Effect on the Flow Prediction through A High Pressure Turbine Cascade", 한국마린엔지니어링학회지, 35(7), pp.938~945 (2011), 한국마린엔지니어링학회