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PRODUCT
HM 133 Visualisation of Flow Fields
Education / GUNT Hamburg / Fluid Mechanics and Hydrology / Flow around Bodies /
description

Fine gas bubbles are perfectly suited to visualising flow fields. Due to the Reynolds analogy, many flow processes that occur in air can also be demonstrated by experiments in water.
  The experimental unit HM 133 can be used to visualise laminar and turbulent flow processes in a water channel. Hydrogen bubbles are generated electrolytically at a cathode made of thin platinum wire. A stainless steel plate is used as an anode. Small bubbles that detach from the platinum wire are easily carried along by the flow due to their small size.
  An interchangeable model is used in the shallow water channel and flow travels around and through it. Bulbs are located along the experimental section on the walls of the water channel. The indirect illumination results in a high-contrast image.
  The experiments run with a low flow velocity. Flow separation and vortex formation are clearly visible. Different drag bodies or changes in cross sections are used as models, e.g. cylinder, aerofoil profile and rectangle. A flow straightener and a layer of glass balls ensure a smooth and low-turbulence flow. The power for the electrolysis, its pulse and pause length and the flow velocity in the water channel can all be adjusted.

  The well-structured instructional material sets out the fundamentals and provides a step-by-step guide through the experiments.

 

Learning Objectives / Experiments

- visualisation of two-dimensional flows
- streamline course in flow around and through

  models
- flow separation
- vortex formation, demonstration of Karman vortices
- qualitative observation of the velocity distribution in

  laminar and turbulent flow 
- analogy to air flow

Specification

[1] visualisation of flow fields by using electrolytically generated hydrogen bubbles
[2] platinum wire as cathode and stainless steel plate as anode for electrolysis
[3] shallow water channel fitted with bulbs along the experimental section for indirect illumination
[4] various models are included: aerofoil, rectangle, straight plate, curved plate, cylinder (various sizes), various models for changes in cross section
[5] flow straightener and glass balls ensure consistent and low-turbulence flow
[6] different flow velocities via variable-speed circulating pump 
[7] setting power (with display), pulse and pause length of the power and the flow velocity in the water channel

 

Technical Data

Pump with adjustable speed
- max. head: 10m
- max. flow rate: 20L/min
3 cathodes with platinum wire
- diameter: 0,2mm
- length: 30, 50, 75mm
Anode, stainless steel plate, L-shaped
- LxWxH: 70x50x145mm
- thickness: 0,5mm
Water channel: approx. 6L
Experimental section: LxWxH: 560x150x176mm
Illumination: 30 white LEDs on the walls of the water channel

 

Dimensions and Weight
LxWxH: 900x300x220mm (experimental unit)
LxWxH: 360x340x160mm (display and control unit) 
Weight: approx. 24kg
Required for Operation
230V, 50/60Hz, 1 phase or 120V, 60Hz/CSA, 1 phase
Scope of Delivery
1 experimental unit
1 display and control unit
3 cathodes
1 set of models (drag bodies, changes in cross section)
1 set of instructional material
Order Details

070.13300  HM 133  Visualisation of Flow Fields