Experimental study of the forming process : Fluid velocity and fluid-fiber interaction measurements

• A study of the flow in the direct vicinity of a forming wire and a fiber network during forming is reported. The measurements are performed with Particle Image Velocimetry in a scaled system. Index-of-refraction matching is used to gain optical access to the flow. Time resolved measurements of the flow velocity in the vertical and horizontal direction is obtained in a plane with a size of 60 × 40 fiber diameters. The spatial resolution is 2 fiber diameters. Data is obtained for three drainage velocities and two different lengths of the fibers. The relative level of the velocity fluctuations are found to decrease with drainage velocity and is higher in the flow above a network mat of shorter fibers compared to the network made of longer fibers. The size of the flow structures is obtained by spectral analysis and compared for the six cases.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Materialteknik -- Pappers-, massa- och fiberteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Materials Engineering -- Paper, Pulp and Fiber Technology (hsv//eng)

Keyword

A-plane

Drainage velocity

Experimental studies

Fiber diameters

Fiber interactions

Fiber networks

Fluid velocities

Forming process

Optical access

Particle image velocimetries

Spatial resolution

Spectral analysis

Time resolved measurement

Velocity fluctuations

Exhibitions

Flow visualization

Spectrum analysis

Spectrum analyzers

Velocity

Fibers

Publication and Content Type

ref (subject category)

kon (subject category)