SEDIMENT TRANSPORT DEMONSTRATION CHANNEL S8 MKII

Demonstration Capabilities

Fixed, smooth bed flow

The flume may be used without sediment on the bed to demonstrate the following flow phenomena and governing equations:

• Tranquil, sub-critical flow - movement of surface waves upstream against flow
• Rapid, super-critical flow - dominance of inertial over gravity forces, 'shock waves' from flow obstructions 
• Hydraulic jump - transition from super to sub critical flow, air entrainment, mixing
• Turbulence - flow visualisation for example by dye injection from a hypodermic syringe (not supplied)
• Flow measurement - using sharp crested weirs
• Governing equations of open channel flow - Reynolds' number, Froude number, continuity, Bernoulli's equation, weir equations

FLOW OVER A MOBILE SAND-BED
Sequence of bedforms associated with increasing flow intensity and sediment transport rate. The following bedforms are exhibited (as discharge and/or slope are increased):-

Lower Regime

• plane-bed (no motion)
• ripples
• ripples and dunes
• dunes
• washed-out dunes

Upper Regime

• plane-bed (with motion)
• standing waves
• anti-dunes
• breaking anti-dunes
• chutes and pools

Technical specification

Channel working section:

• Length: 1.55m
• Width: 78mm
• Depth: 110mm

Discharge rate:
3 fixed flow rates between 0.2 and 0.6 litres/sec, selected by switch on pump

Slope: 0 to 10%

Sediment diameter: 0.1 to 0.3mm

Weight of sand supplied: 15kg

Requirements

Single phase mains electrical supply:

• S8MKII-A: 220-240V/1ph/50Hz
• S8MKII-B: 120V/1ph/60Hz
• S8MKII-G: 220V/1ph/60Hz 

SEDIMENT TRANSPORT DEMONSTRATION CHANNEL S8 MKII