Method for determining at least one charge characteristic of electrical charges of particles in a fluid stream and a fluid stream charge measuring device
AssigneeBundesrepublik Deutschland, Vertreten Durch Das Bundesministerium FüR Wirtschaft Und Energie
InventorHolger Grosshans
Life of this patent
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Abstract
A method for determining a charge characteristic of electrical charges of particles in a fluid stream includes directing the fluid stream containing particles through a fluid line. Then a spatially-resolved determination of a measuring field-less particle velocity in a measurement area without an electrical measuring field is performed. An electrical measuring field is applied transverse to the flow direction in the measurement area. A spatially-resolved determination of a midfield particle velocity in the measurement area is determined. At least one charge characteristic which denotes an electrostatic charge of the particles is determined from the spatially-resolved particle velocities.
Claims14
A method for determining at least one charge characteristic of electrical charges of particles in a fluid stream, comprising:
- (a) directing the fluid stream which contains particles through a fluid line;
- (b) performing a first spatially-resolved determination of a measuring field-less particle velocity in a measurement area without an electrical measuring field;
- (c) applying an electrical measuring field transverse to a flow direction in the measurement area;
- (d) performing a second spatially-resolved determination of a midfield particle velocity in the measurement area;
- and
- (e) determining the at least one charge characteristic which denotes an electrostatic charge of the particles, from the first spatially-resolved determination and the second spatially-resolved determination.
A fluid stream charge measuring device, comprising:
- a fluid line,
- a measuring field generator for generating an electrical measuring field in a measurement area of the fluid line,
- a particle image velocity measurement unit configured to automatically determine a spatially-resolved particle velocity distribution by particle image velocimetry, and
- a controller configured to enable the fluid stream charge measuring device to automatically carry out a method comprising:
- (i) measuring a spatially-resolved measuring field-less particle velocity by the particle image velocimetry measurement unit without the measuring field generator generating an electrical measuring field,
- (ii) generating the electrical measuring field by the measuring field generator,
- (iii) measuring a spatially-resolved midfield particle velocity by the particle image velocimetry measurement unit, and
- (iv) determining at least one charge characteristic which denotes an electrostatic charge of the particles from the spatially-resolved particle velocities.
Dependencies are inferred from the claim text.