Measurement of extensional viscosity of polymer solutions and its effects on atomization from a spray nozzle

被引：41

作者：

Dexter, RW

机构：

[1] American Cyanamid Company, Princeton

来源：

ATOMIZATION AND SPRAYS | 1996年 / 6卷 / 02期

关键词：

D O I：

10.1615/AtomizSpr.v6.i2.30

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A simple method is described for the evaluation of the extensional viscosity of dilute polymer solutions typically used as drift control adjuvants in agricultural sprays. Extensional viscosity characteristics were determined for a wide range of polymer types and molecular weights, by measurements of the flow of solutions through a packed bed of screens over a range of pressure. The polymer types are classified according to their extensional viscosity-strain rate response characteristics. The effects of molecular weight, concentration and polymer type are discussed. A correlation is demonstrated for all the polymer solutions tested relating the extensional viscosity at strain rates occurring in agricultural spray processes with the droplet size distribution Shear viscosity and polymer concentration also affect the median droplet size, but no correlation exists over all polymers.

引用

页码：167 / 191

页数：25

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