A robust item of equipment designed to reproduce the classic
experiments of Professor Osborne Reynolds.
> To compute Reynolds number (R
> To observe and quantify transitional flow
The latest version of this data sheet is available at:
• Floor standing apparatus to produce classic Osborne
• Fluid enters a vertically mounted test section through
a carefully profiled bellmouth from a constant
• An easily cleaned dye injection system is incorporated
• Fluid flow is controlled by a needle point globe valve
• Supply includes stilling bed, hoses and dye
The Armfield Osborne Reynolds’ Apparatus can be
bench or floor mounted and is designed for the
vertical flow of a liquid through a precision bore
glass tube. The use of a vertical direction for the flow
compensates for the effect of any small deviations of
the density of dye relative to that of the working fluid.
The operating fluid may be supplied from any
small bore supply point by means of the flexible
hose provided. Fluid enters a cylindrical constant
head tank through a ring diffuser and then
through a stilling bed to eliminate any gross
variations of fluid velocity in the head tank.
This tank therefore provides uniform, low-
velocity head conditions upstream of the entry
to the vertically mounted pipe test section.
Fluid enters this section through a profiled
bellmouth, designed to uniformly accelerate the
fluid without any spurious inertial effects.
The cylindrical pipe test section is mounted
inside a fabricated shroud that provides an
uninterrupted background for observations of
the dye trace behaviour. Dye solution is admitted
to the test section through a fine diameter
stainless steel tube and the rate of flow of dye is
controlled by a needle valve on the outlet of the
dye reservoir. The dye injection system can be
readily removed for cleaning and maintenance.
The flow rate of the working fluid through the test
section is regulated by a globe valve located in the
base of the apparatus. The rate may be measured
either volumetrically or by weighing (equipment
for this purpose is not supplied). The apparatus
is compatible with any means chosen to alter the
kinematic viscosity of the fluid, either by using
different fluids or by altering the temperature of a
given fluid (the external circuit for this is not supplied).
The whole apparatus is mounted on a substantial
fabricated steel support and a means is provided
for levelling the apparatus to ensure the test
section is vertical. The stilling bed, all necessary
connecting hoses, an initial supply of dye and an
instruction manual are supplied with the apparatus.
Water supply: Up to 0.5 l/sec maximum
Follow us on Twitter, Facebook,
* Excluding DLMx range