Natural Drag-Reducing Polymers: Discovery, Characterization and Potential Clinical Applications
نویسندگان
چکیده
منابع مشابه
Natural Drag-Reducing Polymers: Discovery, Characterization and Potential Clinical Applications
About seven decades ago, it was discovered that special long-chain soluble polymers added to fluid at nanomolar concentrations significantly reduce resistance to turbulent flow (Toms effect). These so-called drag-reducing polymers (DRPs) do not affect resistance to laminar flow. While the flow parameters associated with the Toms effect do not occur in the cardiovascular system, many later studi...
متن کاملHemorrhagic shock, drag-reducing polymers and 'spherical cows'
It was a pleasure to read the elegant and witty commentary by Gutierrez and Fuller [1] regarding our paper published in Shock [2] on resuscitation of rats using our aloe-derived drag-reducing polymer (DRP) solution. However, we disagree with the statement that, 'the application of physical principles to complex living organisms often requires assumptions ad absurdum.' There is always physics be...
متن کاملDrag Reducing Polymers in Vascular System: Viscosity Measurement and Polymers Types and Concentrations
Toms (1949) discovered that if a very small amount of drag reducing polymers (DRP) are added in the flow, approximately 10 ppm by weight or less, a substancial reduction in pressure drop at a given flow rate resulted. Then, since 1948, the phenomenon of drag reduction have been studied by many researchers with the objective of understand the drag reduction mechanism. In the last decades, the dr...
متن کاملVIEWPOINT Polymers Reduce Drag
F rictional drag steals energy from a moving fluid, but the loss usually becomes greater as the flow goes from smooth, or “laminar,” to turbulent. The onset of turbulence therefore poses a problem for many situations involving fluid flow through a conduit, be it oil in a giant pipeline, blood in a human aorta, or liquid in a heat exchanger. One established solution is to add a small amount of p...
متن کاملDrag enhancement with polymers.
Drag on a cylinder can be enhanced in the presence of polymers. This enhancement is directly related to the interaction of the polymers with the flow around the obstacle. The presence of the polymers modifies the flow in the vicinity of the cylinder giving rise to a band of higher shear, large molecular elongations and large velocity fluctuations. The measured drag on the cylinder is directly r...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Fluids
سال: 2016
ISSN: 2311-5521
DOI: 10.3390/fluids1020006