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

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

Study on Velocity Measurement and Numerical Computation in a Rectangular Duct with $90^\circ$ Bend Elbow

곡면 엘보우를 가진 사각덕트 내의 유속측정 및 수치계산에 관한 연구

  • Published : 2003.11.01
Download PDF
⟨ Previous Next ⟩

Abstract

Fluid flow in a rectangular duct for 90$^{\circ}$ bend elbow with the ratio of 1.5 between its curvature radius and width is measured by 5 W laser doppler velocity meter. The fluid flow is also computed by commercial software of STAR-CD for comparison between measured and computed velocity profiles in the duct. Reynolds numbers for the comparison are 11,643, 19,746 and 24,260. From the comparison, computation of principal velocity components in the duct predicts the experimental data somewhat satisfactorily even though those of minor velocity components and turbulent kinetic energy do not match with the experimental data quite well. K-factor for the bend elbow is computed to be average 0.086 while the equivalent ASHRAE data is 0.07.

Keywords

References

  1. Korean Journal of Air-Conditioning and Refrigeration Engineering v.6 no.3 Numerical analysis of turbulent flow and heat transfer in a rectangular duct with a 180° bend degree Choi,Y.D.;Moon,C.
  2. ASHRAE Transactions: Resaerch v.103 Flow modeling of flat oval ductwork elbows using computational fluid dynamics Mahank,T.A.;Mumma,S.A.
  3. International Journal for Numerical Methods in Fluids v.19 Prediction of thermal stratification in a curved duct with 3D body fitted co-ordinate Ushijama,S.
  4. Applied Energy v.51 Accuracy of CFD for predicting pressure losses in HVAC duct fitting Shao,L.;Riffat,S.B.
  5. Journal of Korean Society for Aeronautical & Space Sicences v.25 no.6 The numerical study of a 3D curved duct flow by incompressible Navier Stokes code Shin,B.
  6. Proceedings of the SAREK, Winter Annual Conference(Ⅰ) A Study on turbulence models for the analysis of 3-dimensional flow Kim,H.M.;Kim,K.Y.
  7. Korean Journal of Air-Conditioning and Refrigeration Engineering v.13 no.12 Velocity measurement in a rectanglular duct with 90° mitered elbow Yoon,Y.H.;BaemT.H.;Park,W.G.
  8. Star-CD Methodology v3.10
  9. Star-CD User Guide v3.10
  10. General Electric Rev. v.30 no.6 Wirt,L.
  11. ASHRAE Hand book