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Three turbulent drag coefficients in beds of spheres
Author(s) -
Tallmadge John A.
Publication year - 1967
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690130336
Subject(s) - drag , drag coefficient , reynolds number , drag equation , mechanics , turbulence , parasitic drag , zero lift drag coefficient , aerodynamic drag , drag divergence mach number , thermodynamics , physics , lift induced drag
Form, shear, and total drag have been studied in the 2,500 to 65,000 range of Reynolds number over a wide range of porosity by using the data of Thodos and co‐workers. The effect of Reynolds number was found to be the −0.14 power for form drag, the −0.19 power for total drag, and the −0.5 and highe power for shear drag, so that the ratio of shear drag to total drag decreased from about 16% to less than 5% with increasing Reynolds numbers. For the 2,500 to 6,000 range of Reynolds number, experimental evidence supports the apparently analogous behavior between average shear drag and average heat flux. Limitations and related evidence of this behavior are also discussed. Methods are suggested for estimating drag ratios and coefficients by using the correlation of this work.