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

The Society of Air-Conditioning and Refrigerating Engineers of Korea (대한설비공학회)
권호 표지

Effects of Rib Shapes on the Friction Factors and Heat Transfer in a Rectangular Duct

사각 덕트에서 거칠기 형상이 마찰계수와 열전달에 미치는 효과

  • 안수환 (경상대학교 수송기계공학부) ;
  • 손강필 (경상대학교 기관공학과 대학원)
  • Published : 2001.05.01
Download PDF
⟨ Previous Next ⟩

Abstract

A comparison of fully developed heat transfer and friction factor characteristics has been made in rectangular ducts with ones roughened by five different shapes. The effects of rib shape geometries and Reynolds number are examined. The rib height-to-duct hydraulic diameter, pitch-to height ratio, and aspect ratio of channel width to height are fixed at $e$/De=0.0476, P/$e$=8, and W/H=2.33, respectively. To understand the mechanisms of the heat transfer enhancements, the measurements of the friction factors are also conducted in the smooth and rough channels. The data indicates that the triangular type rib has a substantially higher heat transfer performance than any other ones in the range we studied.

Keywords

References

  1. Proc. Inst. Mech. Engrs 145 The friction factor and heat transfer coefficients of rough pipes Cope, W. F.
  2. AERE Lib/Trans. v.786 Heat transfer and pressure drop in rough tubes Nunner,W.
  3. J. Heat Transfer v.120 Heat transfer-friction characteristics comparison in rectangular ducts with silt and solid ribs mounted on one wall Hwang,J.J.
  4. Int. J. Heat Mass Transfer v.21 An investigation of heat transfer and friction factor for rib-roughened surfaces Han,J.C.;Glicksman,L.R.;Rohsenow,W.M.
  5. Trans. KSME(B) v.24 no.5 Effects of discrete rib-turbulators on heat/mass transfer augumentation in a rectangular duct Kwon,H.J.;Wu,S.J.;Cho,H.H.
  6. ASME Symposium v.HTD-202 Disruption shape effects on the performance of enhanced tubes with the separation and reattachment mechanism Arman, B.;Rabas, T. J.
  7. Mechanical Engineering v.57 Describing uncertainties on single sample experiments Kline,S.J.;McClintock,F.A.
  8. Univ. of Califonia, Berkeley, Publications on Engineering v.2 Dittus,F.W.;Boelter,L.M.K.
  9. Heat Transfer Holman, J. P.
  10. Proc. 11th Int. Heat Transfer Conf. v.5 Enhanced forced convection in triangular ducts by roughened surface Kang, H. J.;Wong, T. T.;Leung, C. W.
  11. Laws of flow in rough Pipes Nikuradse,J.
  12. Int. J. Heat Mass Transfer v.6 Heat and momentum transfer in smooth and rough tubes at various Prandtl number Dipprey,D.F.;Sabersky,R.H.
  13. Int. J. Heat Mass Transfer v.14 Heat transfer and friction in tubes with repeated-Rib roughness Webb,R.L.;Eckert,E.R.G.;Goldstein,R.J.
  14. Report No. DSR 74590-86, Heat Transfer Lab. Evaluation of the heat transfer perfomance of three enhanced surface heat exchanger performance comparison method Mack,W.M.;Rohsenow,W.M.