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Products  |  Fluid Mechanics  |  Fundamentals of Fluid Mechanics  |  HM 164
HM 164 Open Channel and Closed Channel Flow Show data sheet (pdf file) Print page
Technical Description

  HM 164 is used to demonstrate different flow processes at different control structures in the open channel. In the closed channel, energy losses at the inlet and outlet of a pipe flow are studied and the dynamic pressure component in a pipe, the culvert, is determined.
  The trainer includes a transparent experimental flume with upper limit, a height-adjustable sill and a closed water circuit. The water level in the experimental section is set with an adjustable plate weir at the water outlet. With a simple alteration, the experimental flume can be used as an open or closed channel.
  The water level must be low when investigating the open-channel flow. To conduct the experiment, a weir is attached to the bottom of the channel or the height-adjustable sill is used. Furthermore, the discharge under a gate can also be demonstrated. Various weirs, which can be exchanged quickly and safely, are available as control structures.
  When studying the closed channel, the water level needs to be high enough that the entire experimental section is fully flowed through. In this case the sill is used to change the cross-section flowed through. The pressure ratios in the inlet, outlet and the culvert are investigated.
  The static pressures and the total pressure over the cross-section are detected by measuring tubes. The pressure difference is used to calculate the flow velocity.

 The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.


Learning Objectives / Experiments

Open channel
- flow over control structures: broad-crested weir,

  narrow-crested weir, ogee-crested weir with ski

  jump spillway, sill
- discharge under a gate
- hydraulic jump
Closed channel
- pipe flow with constant and variable flow cross-

- measurement of static pressure and total pressure
- calculation of the flow velocity
Comparing open-channel flow with pipe flow


* Flow processes in the open channel: gate,

  sill and various weirs1
* Flow processes in the closed channel: culverts and

  pipe flow1
* Closed water circuit with tank and pump

Alternative products
HM 150.21 -- Visualisation of Streamlines in an Open Channel
HM 160 -- Experimental Flume 86x300mm

[1] investigation of flow processes in the open and closed channel
[2] experimental flume with upper limit, made of transparent material
[3] height-adjustable sill in the bottom of the experimental flume
[4] water level adjustable via plate weir at the water outlet
[5] simple conversion from open to closed channel
[6] control structures for experiments in the open channel: broad-crested weir, narrow-crested weir, ogee-crested weir with ski jump spillway, sill, gate
[7] fully flowed through experimental section and change in cross-section over sill for experiments in the closed channel
[8] closed water circuit with supply tank and pump
[9] transparent measuring tubes for measuring static pressure and total pressure


Technical Data

Experimental section
- length: 1,1m
- cross-section WxH: 40x300mm
Supply tank: 180L
- power consumption: 550W
- max. flow rate: 230L/min
- max. head: 11m


Dimensions and Weight
LxWxH: 1.585x750x1.600mm
Weight empty: approx. 150kg
Required for Operation
230V, 50/60Hz, 1 phase; 120V, 60Hz/CSA, 1 phase
Scope of Delivery
1 trainer
control structures: broad-crested weir, narrow-crested weir, ogee-crested weir with ski jump spillway, sill, gate
1 plate weir
1 tool
1 set of instructional material
Order Details

070.16400  HM 164  Open Channel and Closed

                                  Channel Flow

© 2005 G.U.N.T. Gerätebau GmbH