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HYDROLOGY AND FLUID MECHANICS
3.2.3 Osborne Reynolds Number Apparatus(RE 01)


Left: Streamline
Right : As self-contained unit.
Figure 3.1 Equipment configuration.

General Description :
The instrument is useful for determining of Osborne Reynolds number. The equipment configuration is in vertical direction and can be run using tap water or as a part of hydraulic bench. Tap water without recycle of water is recommended because the flowrate is very small value such as less than 1 litre/minute. The incoming water at constant head is flowed to inlet bell mount at a certained flow rate. Dye injection is made in according with the water velocity inside the glass tube. Here streamline and non-streamline can be created upon the Reynolds number.

Experimental Capability :
  1. To study and learn how to determine Reynolds number, Re by experiment.
  2. Effects of fluid viscous forces, static pressure and acceleration of fluid flow.

Specification :
  1. Glass tube: 12.5mm inside diameter. 700mm total length, effective length about 600 mm.
  2. Main cylinder: Head cylinder made with cleared acrylic, <= 145mm insided diameter x 200mm height. Contained glass balls for getting less water turbulent.
  3. Dye bottle : Cleared plastic, 400ml effective volume with needle and flow control valve.
  4. Supporting frame : All stainless steel.
  5. Flow measurement: 1000ml graduate cylinder and stop watch will be provided.
  6. Dye: Food color. Red color is one of the best for streamline construction.
  7. Dimensions and weights(approx.): 400mmW x 400mmL x 1,500mm H , 40KGS Gross weight.

Delivery :
  1. Completed set of Osborne Reynolds number.
  2. Instruction manual with typical experimental results.

Typical Experimental Results :


Left: Upper streamline.
Right : Lower streamline.
Figure 5.1 Demonstrating of Laminar Flow.


Left: Initial transition.
Right : Final transition.
Figure 5.2 Flow Behavior in Transition Region.


Turbulent flow.
Figure 5.3 Flow Behavior in Turbulent Region.

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