Korean Journal of Air-Conditioning and Refrigeration Engineering (설비공학논문집)

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
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Heat Transfer and Flow Characteristics by Trapezoid Rod Array in Impinging Jet System

충돌제트계에서 사다리형 로드 배열에 의한 열전달 및 유동특성

  • 금성민 (한라대학교 기계공학부)
  • Published : 2001.09.01
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Abstract

The objective of this study was to investigate the characteristics of jet flow and heat transfer caused by trapezoid rods array in impinging jet system. In this study, trapezoid rods have been set up in front of flat plate to serve as a turbulence promoter. The bottom width of trapezoid rod was W=4, 8 mm and oblique angle were 80$^{\circ}$. The space from rods to the heating surface was C=1, 2, 4 mm, the pitch between each rods was P=30, 40, 50 mm, and the distance from nozzle exit to flat plate was H=100, 500 mm. This results were compared with the case without trapezoid rods. As a result, when rods are installed in front of the impinging plate, the acceleration of the jet flow and the eddies due to the rods seem to contribute to the heat transfer enhancement. Among test conditions, the heat transfer performance was best for the condition of W=8 mm, C=1 mm, P=30 mm and H/B=10. The maximum heat transfer rate is about 1.9 times larger than that without trapezoid rods.

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References

  1. Int. J. Heat and Mass Transfer v.8 The role of turbulence on determining the heat-transfer characteristics of impinging jets Gardon,R.;Akfirat,J.C.
  2. ASME J. Heat Transfer v.88 Heat Transfer Characteristics of Impinging Two-Dimensional Air Jets Gardon,R.;Akfirat,J.C.
  3. MS. thesis, Inha University Heat transfer augmentation in two-dimensional impinging jet system by turbulence promoter Choi,D.S.
  4. Ph.D. thesis, Inha University An experimental study on the augmentation of heat transfer by impinging air jets Kim,S.P.
  5. Korean J. of Air-Conditioning and Refrigeration Engineering v.10 no.2 Study on the flow characteristics and heat transfer enhancement on flat plate in potential core region of 2-dimensional air jet Lee,Y.H.
  6. Transaction of KSME v.22 no.5 Study on the heat transfer enhancement by mesh Kum,S.M.;Jung,D.S.;Kim,J.B.
  7. Int. J. Heat and Mass Transfer v.43 Measurements of impinging jet flow and heat transfer on a semi-circular concave surface Choi,M.S.;Yoo,H.S.;Yang,G.Y.;Lee,J.S.;Sohn,D.K.
  8. Ph. D. thesis, Inha University A study on the heat transfer augmentation by impinging air jets by swirl Park,S.S.
  9. Ph. D. thesis, Inha University Heat transfer augmentation in 2-dimensional impinging air jet system Lee,Y.H.
  10. Heat Transfer Japanese Research v.24 no.2 A study on heat transfer enhancement by a square-rod array in an impinging jet system Kum, S. M.;Gawaguchi, Y.;Seo, J. Y.
  11. Ph. D. thesis, Inha University A study on heat transfer augmentation by hybrid rod in impinging air jet Kim,D.C.
  12. Introduction to Heat Transfer(3rd ed.) Incropera,F.P.
  13. Transaction of KSME v.22 no.3 Heat transfer coefficient measurement by a jet impinging on a rib-roughened convex surface Chung, Y. S.;Lee, D. H.;Lee, J. S.
  14. Industrial and Engineering Chemistry Fundamentals v.16 Characterization of the impingement region in and axisymmetric turbulent jet Giralt,F.;Cjina,C.;Trass,O.
  15. Journal of Chemical Engineering-Japan v.20 Role of large scale coherent structures in impinging heat transfer Kataoka,K.;Sahara,R.;Ase,H.;Harada,T.
  16. Int. J. Heat and Mass Transfer v.14 Heat transfer and friction in tubes with repeated-rib roughness Webb,R.L.;Eckert,E.R.G.;Goldstein,R.J.