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ENHANCEMENT OF HEAT TRANSFER BY A COMBINATION OF AN INTERNALLY GROOVED ROUGH TUBE AND A TWISTED TAPE.

Author(s) : USUI H.

Type of article: Article

Summary

A COMBINATION OF A TWISTED TAPE AND AN INTERNALLY GROOVED ROUGH TUBE IS PROPOSED AS A MEANS OF ENHANCING HEAT TRANSFER IN SINGLE-PHASE TURBULENT FLOW. HEAT TRANSFER IS INCREASED REMARKABLY IF THE TAPE IS TWISTED CONTRARY TO THE DIRECTION OF ROTATION OF THE GROOVES AND THE GROOVES HAVE A HIGH RELATIVE ROUGHNESS, WITH A VALUE OF 2.2% WITH RESPECT TO THE TUBE DIAMETER BEING MORE EFFECTIVE THAN 1.1%. FOR THE SAME POWER CONSUMPTION, THE HEAT TRANSFER COEFFICIENT IS 3.0-3.5 TIMES HIGHER, WHILE FOR THE SAME PUMPING POWER AND HEAT DUTY, THE HEAT TRANSFER SURFACE IS 70-75% SMALLER THAN WITH A SMOOTH TUBE.

Details

  • Original title: ENHANCEMENT OF HEAT TRANSFER BY A COMBINATION OF AN INTERNALLY GROOVED ROUGH TUBE AND A TWISTED TAPE.
  • Record ID : 1986-1849
  • Languages: English
  • Source: Int. chem. Eng. - vol. 26 - n. 1
  • Publication date: 1986/01
  • Document available for consultation in the library of the IIR headquarters only.

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