Model:C16
Use:Hydrogen Bubble Flow Visualisation System
Features / benefits
Low-voltage operation via universal power supply for improved safety
LED illumination
Supplied with:
- Set of Three Weirs
- Set of Three Electrodes
- Set of Clear Acrylic Flow Visualisation Models
The armfield hydrogen bubble flow visualisation system is compact, bench mounted and self-contained requiring only filling with water and connecting to a mains electrical supply.
It comprises a flow tank, a separate electronic control console and a comprehensive set of clear acrylic flow visualisation models.
The top of the flow tank is manufactured from glass-reinforced plastic (GRP) for durability and incorporates a wide, shallow working section with a flat black acrylic bed for flow visualisation studies. A smooth flow of water at variable velocity is passed through the working section.
This is achieved by using a unique fluid drive unit, in combination with flow straighteners. The depth in the working section can be changed by a set of weir strips at the discharge end.
A number of acrylic models are provided with the equipment, such as an aerofoil section and cylinders of different diameters. These can be positioned in the working section to show the flow effects around these shapes. User-defined models can also be used.
A lighting module, placed in the water at the side of the working section, produces a wide beam of light below the surface of the water and illuminates the hydrogen bubbles to aid visualisation of the flow patterns.
The hydrogen bubbles are produced by a fine platinum/iridium cathode wire located under the surface of the water and normal to the direction of flow. The wire is kept taut by a forked holder (supplied in three widths) and is held in the required position by tripod with adjustable support. Hydrogen bubbles can be produced using plain tap water, however Glauber’s salt (sodium sulphate) is also supplied with the unit for research purposes.
The electronic control console provides all of the necessary electrical services for the flow tank and incorporates the hydrogen bubble generator. All operating parameters are displayed on a liquid crystal display. Controls are included for the water pump, light source and hydrogen bubble generator.
The size of the hydrogen bubbles can be varied by adjusting the current to the cathode wire. The generator automatically maintains the current at the required value by varying the supply voltage to compensate for changes in the loop resistance.
The generator can produce a continuous stream of bubbles if required. However, to aid visualisation and enable quantitative measurements to be made, the bubbles can be turned ‘on’ and ‘off’ in a series of pulses, the pulses and spaces being independently and continuously variable with both times indicated on the display.
Technical specifications
Pulse generator
0 to 4750ms (on and off period)
Light Source
48 High intensity light emitting diodes
3 x Electrodes
35mm, 50mm and 75mm Wide
Cathode type
Platinum/Iridium
Flow tank capacity
20 litres
1 x Set of Clear Acrylic Flow Visualisation Models in Protective Container Comprising
2 x Straight Guide (330mm Long)
2 x Spacer Block for Straight Guides
2 x Blocks with Radiused Ends
4 x Cylinders (6mm, 12mm, 18mm and 25mm diameter)
1 x Aerofoil Section
1 x Flat Plate with Radiused End
2 x Rectangular Block (70mm x 40mm x 20mm)
1 x Curved Plate
2 x Stepped Block
Overall dimensions
Electronic control console
Length
0.31m
Width
0.26m
Height
0.10m
Flow tank
Length
0.845m
Width
0.40m
Height
0.225m (tank only)
Packed and crated shipping specifications
Volume
1.2m3
Gross weight
150Kg