Pipes and tubular conduits – With flow regulators and/or baffles – Heat transfer
Patent
1981-12-08
1984-01-17
Marcus, Stephen
Pipes and tubular conduits
With flow regulators and/or baffles
Heat transfer
72276, 165133, F15D 106
Patent
active
044259425
ABSTRACT:
A finned tube for a heat exchanger has an inner surface in which is provided raised portions which are in rows and extend in the longitudinal direction of the tube. The raised portions are arranged, within each row, at irregular intervals and each raised portion may either increase or decrease toward a radially inward tip. The raised portions may have a cross-section which is substantially triangular or trapezoidal or in the shape of a parallelogram and lateral surfaces of the raised portions, together with the internal surfaces of the tube are roughened during drawing. In a process of making such a tube, an unhardened tube having a plurality of circumferentially disposed longitudinally extending fins is drawn through a die so as to subject the tube to a cross-sectional decrease of at least 50% to thereby fragment the fins to provide gaps between remaining raised portions of the fins. A drawing die for use in the process has an entry angle .alpha..gtoreq.40.degree..
REFERENCES:
patent: 3267563 (1966-08-01), Seaton
patent: 3267564 (1966-08-01), Keyes
patent: 3273599 (1966-09-01), Heeren
patent: 3402767 (1968-09-01), Bohdansky et al.
patent: 3612175 (1971-10-01), Ford et al.
patent: 4314587 (1982-02-01), Hackett
patent: 4349949 (1982-09-01), Kritzer
Hage Manfred
Schinkoth Gerhard
Marcus Stephen
Thronson Mark
Wieland-Werke A.G.
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