Patent ID: 8485230
Filing Date: 2013-07-16
Classification: B01F,C23C,F16L

Abstract:
1. A gas delivery pipe for transmitting a gas, the pipe comprising a wall defining a lumen of the pipe; an inlet aperture through which gas flows into the pipe; an outlet aperture through which gas flows out of the pipe; wherein the pipe has an index, SI, characterizing a degree to which the pipe is serpentine that is equal to an integral of an absolute value of changes in angle of direction that a unit vector tangent to a midline of the lumen undergoes in moving along the midline from the inlet to the outlet aperture, which integral has a value greater than or about equal to 180°; a ratio, R a relative rate of change of area A of cross section of the pipe as a function of displacement s, (1/A)∂A/∂s, along the midline, is less than or equal to about 0.25.