Back to results
US 4,228,852 AGranted
Tubular body
OwnerAkira Togashiinventor
Life of this patent
Estimating the term…
Abstract
A tubular body on whose external surface are formed a series of periodically wavy recesses of specific depth and angle, said recesses becoming the corresponding series of similarly wavy projections and thereby improving the mixed state or heat conduction efficiency of a fluid flowing therein.
Claims19
A tubular body comprising a series of periodically wavy recessed ribs formed on the external surface of the tubular body, said recessed ribs having a specific depth and a specific wave form about a base line at a center of the wave form, the base line being spirally formed at a specific lead angle to a plane containing the longitudinal axis of the tubular body;
- and a corresponding series of projecting ribs having the same specific wave form about the same base line formed on the internal surface of the tubular body;
- and the specific wave form being selected from a group of wave forms consisting of a sinusoid wave form, a saw tooth wave form, a wave form made of continuously connected alternating opposite semicircular curves, and a rectangular wave form.
Dependencies are inferred from the claim text.