Abstract




 
   

Vol. 5, No. 1&2 (May 1992) 61-68   

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  PREDICTION OF FLUID FLOW AND HEAT TRANSFER CHARACTERISTICS BEHIND A SINGLE BACKWARD-FACING STEP
 
 
A.K.M. Sadrul Islam and S. Ahmed

  Department of Mechanical Engineering
Bangladesh University of Engineering and Technology
Dhaka-Bangladesh

 
 
 
 

Abstract    Numerical solutions based on standard finite volume method are presented for the study of heat transfer and fluid dynamic characteristics in turbulent flows behind a single sided backward-facing step. The calculation of the differential equations is performed using SIMPLE algorithm. For the turbulent quantities standard K-model is used. Predicted mean velocity profiles and reattachment lengths comply with the experimental data but significant deviation occurs in the predictions of turbulent intensities. The predicted heat transfer coefficient is in good agreement up to the reattachment point and downstream of that point it matches qualitatively.

 
 

References   

1. Amano, R., AIAA Journal ,Vol. 21, (1983), 1400-1405 .

2. Aung, W. and Watkins, C. B., “Heat Transfer Mechanism in Separated Forced Convection”, Proc. of the NAT Inst on Turbulent Forced Convection in Channels and Bundles, Theory and Application to Heat Exchangers,” Turkey, Vol. 2, (June. 20. Aug. 1978).

3. Chieng, C. C. and Launder, B. E., “Numerical Heat Transfer”,Vol. 3, (1987), 189-207 .

4. Eaton, J. K.and Johnston, J. P., “Turbulent Flow Reattachment”An Experimental Study of the Flow and Structure Beind a Backward-Facing Step”. Report MD-39, Stanford University, Stanford, CA, 94305, (June. 1980).

5. Fletcher, L. S., Briggs, D. G. and Page, R. H.”, J. of Tech.Vol. 12, (1974), 236-361.

6. Jayatileke, C.C.V.”, Prog. Heat andMass Transfer.” Vol. 1, (1969), 193-329 .

7. Leonard, B. P., Leschziner, M. A. and McGurik, J. J., “Third Order Finite-Difference Method for Steady Two-Dimensional Convection”, Numerical Methods in Laminar and Turbulent Flows, Pentach, London, England, (1978).

8. Leonard, B. P. , Comp. Methods in Appli. Mech. and Eng. Vol. 19, (1979), 59-98.

9. Leschziner, M. A. and Rodi, W., J. Fluid Engg., ASME.” Vol. 103, (1981), 352-360.

10. Patanker, S. V.andSpalding, D. B., Int. J. Fluid Mass Transfer, Vol. 15, (1972), 1787-1806.

11. Vogel, J. C. and Eaton, J. K., J. of Heat Transfer, ASME.”, Vol. 107, (1985), 922-929 .

12. Vogel, J. C.and Eaton, J. K.,”Heat Transfer and Fluid Mechanical Measurements in the Turbulent Reattaching Flow Behind a Backward Facing Step”. Report MD-44, Thermosciences Division, Dept. of Mechanical Engineering, Stanford University, (July. 1984).

13. Westphal, R., “Experimental Study of Flow Reattachment in a Singlesided Sudden Expansion” Ph.D. Dissertation, Dept. of Mechanical Engineering, Stanford University, USA, (1982). 1. Khotanzad, A. and Lu, J. H.,”Classification of Invariant Image Representations Using Neural Network , to appear in IEEE Transactions on Acoustics, Speech, and Signal Processing.”,Vol. 38, (1990).





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