END EFFECT IN A COAXIAL CYLINDRICAL VISCOMETER

被引：11

作者：

KOBAYASHI, H ^{[1
]}

NASHIMA, T ^{[1
]}

OKAMOTO, Y ^{[1
]}

KAMINAGA, F ^{[1
]}

机构：

[1] IBARAKI UNIV, FAC ENGN, HITACHI, IBARAKI 316, JAPAN

来源：

REVIEW OF SCIENTIFIC INSTRUMENTS | 1991年 / 62卷 / 11期

关键词：

D O I：

10.1063/1.1142209

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The end effect in a coaxial cylindrical viscometer was determined as an effective length of an inner cylinder (bob) using the multiple bob method. In this viscometer, the data are for a rotating bob and not for a rotating cup. The end correction appears to increase over the Reynolds number 10, even in low viscosity and Newtonian liquids. It is shown that a conical end of the bob and a wide gap between the bob and cup give a larger end correction. The visualization of the liquid flow at the bottom of the bob makes it clear that the stream lines enter into the annular gap even in Couette flow, which is supposed to disturb the flow in the gap. With the increment of the Reynolds number, these entrances become larger, although the flow is not Couette but Taylor and turbulent flows.

引用

页码：2748 / 2750

页数：3