Details

Autor(en) / Beteiligte

• Soares, Edson J.

Titel

Review of mechanical degradation and de-aggregation of drag reducing polymers in turbulent flows

Ist Teil von

• Journal of non-Newtonian fluid mechanics, 2020-02, Vol.276, p.104225, Article 104225

Ort / Verlag

Amsterdam: Elsevier B.V

Erscheinungsjahr

2020

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• •The main theories and advances in polymeric DR are discussed.•Important aspects of mechanical polymer degradation are pointed out.•The importance of some important variables to accelerate or delay the mechanical polymer degradation is discussed.•The role that polymer de-aggregation plays on the fall of polymeric DR is discussed.•The single available numerical work on mechanical polymer degradation is discussed. The efficiency of drag reduction (DR) is known to be impaired by mechanical scission of molecules, which is a great obstacle to the practical use of flexible polymeric drag reducers. In this review, I try to give an account of the main aspects of this problem, pointing to the important variables (concentration, molecular weight, temperature, Reynolds number, quality of solvent, residence time, and relaxation time) that accelerate or delay the molecular scission of linear polymer chains in turbulent flows. The impairment of DR can also be related to de-aggregation, owing to the rupture of the intermolecular associations, instead of intra-molecular mechanical scission.