Here we used modified PIV technique completed with long distance microscope probe for experimental investigation of the flow velocity profile in a rectangular duct. We came from the analytical and numerical prediction of the entrance length for fully developed velocity profile. The results of measurement completed knowledge about the flow stability and velocity profile shape in the channel of 0.00375 hydraulic diameters. There was marked a range of entrance length constant for the transient flow area. The presents of the fluctuating velocities in the transition flow is explained with POD snapshot and modes projection. The minimal entrance length for the laminar, transition, and turbulent flow is set.
REFERENCES
1.
F.
Durst
, S.
Ray
, B.
Unsal
and O.A.
Bayoumi
, The Development Lengths of Laminar Pipe and Channel Flows
, Journal of Fluids Engineering
6
127
, 1154
–1160
, 2005
.2.
R.J.
Goldstein
and D.K.
Kreid
, Measurement of Laminar Flow Development in a Square Duct Using a Laser-Doppler Flowmeter
, Journal of Applied Mechanics
67
, 813
–818
, 1967
.3.
E.M.
Sparrow
, C.W.
Hixon
and G.
Shavit
, Experiments on Laminar Flow Development in Rectangular Ducts
, Journal of Basic Engineering
3
, 116
–123
, 1967
.4.
H. L.
Langhaar
, Steady Flow in the Transition Length of a Straight Tube
, Journal of Applied Mechanics
9
, 1942
.5.
T.
Ahmad
, I.
Hassan
, Experimental Analysis of Microchannel Entrance Length Characteristics Using Microparticle Image Velocimetry
, Journal of Fluids Engineering
132
, 1
–13
, 2010
.6.
V. K.
Natrajan
, The impact of surface roughness on flow through a rectangular microchannel from the laminar to turbulent regimes
, Microfluid Nanofluid
9
, 95
–121
, 2010
.
This content is only available via PDF.
© 2016 Author(s).
2016
Author(s)
You do not currently have access to this content.