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An observation of the effect of integral scale on drag reduction
Author(s) -
Berman Neil S.,
Griswold Susan T.,
Elihu Shahram,
Yuen John
Publication year - 1978
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.690240114
Subject(s) - drag , turbulence , reduction (mathematics) , parasitic drag , drag coefficient , mechanics , flow (mathematics) , scale (ratio) , polymer , pipe flow , materials science , physics , classical mechanics , mathematics , geometry , composite material , quantum mechanics
Drag reduction pipe flow experiments using random coiling polymers have been dominated by the small scales of turbulence. An experiment is reported using polyelectrolytes DNA and collagen, which have extended conformations in solution that shows a relationship between the large scales and drag reduction. Turbulent or molecular interactions can explain the observed increase in drag reduction with an increase in pipe diameter.