Improvements in tubular heat exchange apparatus

  • Inventors:
  • Assignees: Edward Frank Spanner
  • Publication Date: May 24, 1940
  • Publication Number: GB-521548-A


521,548. Straight - tube heat - exchangers. SPANNER, E. F. Oct. 18, 1938, No. 30085. [Class 64 (iii)] A straight tube with inwardly pressed spiral grooves has at its inlet end a plain length of tube of from 4 to 6 times the internal diameter of the tube and its outlet end a plain length of from 2 to 3¢ times the internal diameter. A tube A has two or more spiral grooves G, which may increase in depth, or decrease in pitch, or which may be in short lengths or their direction of rotation may change towards the outlet end of the tube. A plain or twisted strip of metal may be situated lengthwise in the tube. When the fluid flowing in the tubes is a gas, the number and size of the tubes are chosen so that the gas velocity at entrance is not less than 60 feet per second.




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Cited By (4)

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    DE-10100241-A1July 18, 2002Hde Metallwerk GmbhWärmetauscherrohr für flüssige oder gasförmige Medien
    DE-1039076-BSeptember 18, 1958Friedrich Lohmann Dipl IngNach dem Strangpressverfahren hergestelltes Waermeaustauscherrohr und daraus aufgebaute Waermeaustauscher
    DE-1074605-BDecember 31, 1969
    US-7220048-B2May 22, 2007Bayer AktiengesellschaftMixer/heat exchanger