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Products  |  Fluid Mechanics  |  Fundamentals of Fluid Mechanics  |  HM 150.21
HM 150.21 Visualisation of Streamlines in an Open Channel Show data sheet (pdf file) Print page
Technical Description

  HM 150.21 can be used to visualise flow around drag bodies and flow phenomena in open channels.
  Either a drag body or weir is fixed in the experimental flume. The streamlines are made visible by injecting a contrast medium. The experimental flume is made of transparent material so that the streamlines and the formation of vortices can easily be observed. The water level in the experimental flume can be adjusted via a sluice gate at the inlet and via a weir at the outlet.
  There are two weirs and four different drag bodies available for the experiments. A stabiliser ensures an even and non-vortical flow of water.
  The experimental unit is positioned easily and securely on the work surface of the HM 150 base module. The water is supplied by HM 150. Alternatively, the experimental unit can be operated by the laboratory supply.
  The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.


Learning Objectives / Experiments

- how differently shaped weirs affect the flow
- visualisation of streamlines for flow incident to a

- visualisation of streamlines when flowing around

  various drag bodies



* Flow around various drag bodies1
* Incident flow of different weirs1
* Ink as contrast medium for visualising the


Available accessories
HM 150 -- Base Module for Experiments in Fluid Mechanics
Alternative products
HM 160 -- Experimental Flume 86x300mm
HM 164 -- Open Channel and Closed Channel Flow
HM 241 -- Principles of Hydraulics
Fundamentals of Hydrodynamics

[1] visualisation of streamlines during incident flow and flow around various weirs and drag bodies
[2] transparent experimental flume
[3] incident flow demonstrated on two weirs
[4] demonstration of flow around four different drag bodies
[5] contrast medium: ink
[6] distributor for contrast medium with seven nozzles
[7] water level in the experimental flume adjustable via sluice gate at the water inlet and weir at the water outlet
[8] flow straightener for even, non-vortical water inlet
[9] water supply using HM 150 base module or via laboratory supply


Technical Data

Experimental flume
- LxWxH: 625x20x150mm
Contrast medium: ink
Injection of the contrast medium
- 7 nozzles
Tank for water: 12,5L
Tank for ink: 200mL
Drag bodies
- small cylinder, D=35mm
- large cylinder, D=60mm
- streamlined body
- guide vane profile
- broad-crested weir
- sharp-crested weir


Dimensions and Weight
LxWxH: 895x640x890mm
Weight: approx. 24kg
Required for Operation
HM 150 (closed water circuit) or alternatively water connection and drain 
Scope of Delivery
1 experimental flume
1 set of drag bodies and weirs
1L of ink
1 set of tools
1 set of instructional material
Order Details

070.15021  HM 150.21  Visualisation of

                                       Streamlines in an Open


© 2005 G.U.N.T. Gerätebau GmbH