Frontal Suction Methods

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Technology abstract

Frontal Suction Methods are used for instance in kitchen or laboratory environments to remove gases or gaseous pollution by suction.

Technology Description

The basic problem to remove gases or gaseous pollution by suction is the weak suction velocity in the free space. This velocity decreases proportional 1/r² . Where r is the distance from the suction mound or filter area.

Pollutants lighter/heavier than the surrounding atmosphere gather under/on surfaces (density currents). For example water vapour ascends as a thermal jet. When this jet hits a horizontal surface it spreads under this plane as a density current. The typical example is the flow under a cooker hood.

Conventional technologies use high suction rates (= higher suction flow) or sometimes additional jets (air-curtains) to increase the suction flow towards the suction opening or filter areas.

The frontal suction methods create flows that block and reverse  escaping flows near surfaces. A vortex flow or a circular shear flow is created near to a wall. This creates a “dynamical frontal” flow that reaches also into the free space. Polluted gas flows - especially of high velocity - are stopped and transported towards the suction openings. There are three methods to create and to adjust frontal flows.

Innovations & Advantages

  • better suction efficiency
  • less suction volume flow
  • this creates a) less energy costs  b) smaller suction pipe diameters
  • noise reduction
  • possibilities to develop new suction devices and gadgets

Further Information

Current and Potential Domains of Application

Application Fields are:

  • kitchen techniques (origin of developments)
  • laboratory techniques, fume hood
  • production techniques - soldering or welding working places
  • air curtain doors
  • colour spray techniques.