Technical Specifications

Specifications

The Fixed Mobile Bed is mounted on a metallic structure. This unit is divided into three sections: inlet tank, working section (channel) and discharge tank. These sections are assembled through joints in order to get a complete assembly. There is a sand filter between the end of the channel and the discharge tank.

Stainless steel inlet tank with adjustable gate. It is supplied with a control at the upper side of the tank which makes it possible to change the slope of such gate. Dimensions: 530 mm x 710 mm x 530 mm.

Flow channel made of stainless steel, including a main rail with millimeter rulers (Longitudinal cross piece). A structure which includes a sub-rail (transversal crosspiece) is supported on the rail. It makes it possible to put a depth gauge to measure the water level and determine the outline of the sand bed during the development of the practical exercises. Dimensions: 2000 mm x 710mm x 350 mm. The working section is 2000mm x 610 mm, and max. water depth is 120 mm approx.

The practical exercises with this unit are carried out by using water and sand. The sand bed can be placed on a polycarbonate sheet, which is located inside the flow channel.

Discharge tank made of stainless steel with overflow. It is divided into two parts, the one closer to the channel enables the sedimentation of sand, whereas the second part enables the removal of the water which overflows from the first section. Dimensions: 850 mm x 710 mm x 530 mm

Two storage tanks made of polyethylene of approximately 250 l. each one. It has a filter at the pump’s inlet to retain possible residues.

Centrifugal pump: flow range: 7.2 – 18 m /h; height: 14.4  19.70 M.W.C.

Electromagnetic flow meter: flow range: 10-70 l./min.

Membrane valve.

Two different size gates.

A set of models included:

Bridge piers models:

2 rectangular models.

4 cylindrical models.

4 square models.

2 profiled rectangular models.

2 rectangular models with rounded ends

Triangular model.

Asymmetrical aerofoil model.

Six baffles to direct the water flow during the experimental tests.

A set of 12 “L” shaped profiles.

Three pairs of different angles to build additional models

Diagram in the front panel with similar distribution to the elements in the real unit.

Electronic console, including:

Motor-pump starter.

Flow meter measurement display.

Cables and accessories, for normal operation.

Manuals: This unit is supplied with the following manuals: Required Services, Assembly and Installation, Starting-up, Safety, Maintenance & Practices Manuals.

A wide range of optional models available

 

Optional Models

– Float.

– Tank strips.

– Acrylic cylinder 90º angle walls.

– Irrotational bend model.

– Two side wall meanders.

– Two bell mouth entries (right and left hand).

– Vibration of a cylinder and box.

– Weight.

– Retaining block.

 

Services Required:

1. Water Supply.
2. Electrical Supply, 240/440V,3Ph, 50 Hz.
3. Sand bed: grain size: 0.4 – 0.8 mm. Sand bed thickness: 60 mm approximately

 

Experiments

1. Flow around model engineering structures.
2. Mobile bed experiments.
3. Meandering water courses characteristics.
4. Visualization of the behavior of boundary layers.
5. Demonstration of boundary layer suction.
6. Experiments of erosion.
7. Experiments of deposition.
8. Velocity distribution in duct flow.
9. Practices and tests with models for engineering.
10. Two-dimensional flow visualization by the Ahlborn technique.
11. Hydraulic analogy to compressible flow. 12.- Sediment erosion and deposits.
12. Flow visualization and study of stream line patterns.
13. Demonstration of laminar and turbulent flow by flow visualization. (OPTIONAL)