Patent ID: 8347733

Claim:
A flow conditioner for displacing and mixing fluid flow that defines an envelope in a cross sectional direction in a pipe having transducer sites of an ultrasonic flow meter comprising: a first ramp adapted to be disposed in the pipe and extending from the outside of the envelope inward toward the center of the pipe in a downstream direction with respect to the fluid flow and forming an angle between 0° and 90° relative to the pipe's inner surface which displaces a thermal boundary layer from the pipewall; and a second ramp adapted to be disposed in the pipe and in juxtaposition with the first ramp, the second ramp extending from the outside of the envelope inward toward the center of the pipe in an upstream direction with respect to the fluid flow and forming an angle between 0° and 90° relative to the pipe's inner surface which prevents the thermal boundary layer from reattaching to the pipewall, the first and second ramps adapted to be positioned upstream of one of the transducer sites, the first and second ramps extend essentially up to a height of about ⅕ of the diameter of the pipe from the inner surface of the pipe.