Bench top open channel unit designed to conduct experiments related to open channel flows and to visualize stream line patterns over or around various objects.
The system should consist of a clear acrylic flow channel having large width-to -depth ratio.
Overshot and undershot weirs should be provided at the inlet and exit of the channel section.
The channel section should have a bell mouth entry to reduce flow disturbances.
The water flow rate can be varied using a membrane type flow control valve fixed at the exit of the flow channel.
Water flow rate and flow velocity should be measured by the volumetric measuring tank (of the hydraulic bench).
Water should be supplied from the supply tank consisting of glass beads to reduce flow disturbances.
Flow patterns should be visualized using dye injection through needlevalves.
Dye injection rate can be controlled and adjusted to improve the quality of flow patterns.
Experiments:
1. Study of open channel flows
2. Study of flow over weirs – over shot and under shot weirs, broad and narrow crested weirs.
3. Familiarization with water flow visualization technique.
4. Demonstration of laminar and turbulent flow.
5. Study of streamline patterns around cylinders at different Reynolds numbers.
6. Study of streamline patterns around airfoils with and without flap and various incidences.
7. Study of flow pattern around hump, disc, cuboid etc.
8. Study of vortex shedding from cylinders and bluff bodies.
9. Comparison of observed streamline patterns with theory.
Specifications:
1. Flow visualization channel with bell mouth entry, 650mm length, 20mm width and 140mm height, transparent, made of clear acrylic.
2. Supply tank with glass beads, 20 liters capacity.
3. Dye injection system, 0.5 liters reservoir capacity, 5 dye injection needles with needle valves at exit.
4. Depth gauge. 0 – 150mm range.
5. Model fixture.
6. Models: over shot weir, under shot weir, broad crested weir, sharp crested weir, hump, small cylinder, large cylinder, symmetrical airfoil, symmetrical airfoil with flap, un-symmetrical airfoil, wing, disc and cuboid.
