HEAT TRANSFER ENHANCEMENT BY A COMBINATION OF SPIRALLY CORRUGATED TUBES WITH A TWISTED TAPES PART 1 - HYDRAULIC RESISTANCE AND HEAT TRANSFER COEFFICIENTS

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  • TITLE: HEAT TRANSFER ENHANCEMENT BY A COMBINATION OF SPIRALLY CORRUGATED TUBES WITH A TWISTED TAPES PART 1 - HYDRAULIC RESISTANCE AND HEAT TRANSFER COEFFICIENTS
  • AUTHOR(S): V. Petkov
  • ABSTRACT: Heat transfer and isothermal friction pressure drop results have been experimentally obtained for two single-start spirally corrugated tubes combined with five twisted-tape inserts with different relative pitches in the range of Reynolds number - . The characteristic parameters of the tubes are height to diameter ratio, e/Di=0.0371 and 0.0261; pitch to height ratio, p/e=11.6 and 15.9; and relative pitch, H/Di= 15.68-5.80. Significantly, higher friction factor and inside heat-transfer coefficients than those of the smooth tube under the same operating conditions have been observed.4 10 410 
  • PAGES: 56-
  • DOWNLOAD: HEAT TRANSFER ENHANCEMENT BY A COMBINATION OF SPIRALLY CORRUGATED TUBES WITH A TWISTED TAPES PART 1 - HYDRAULIC RESISTANCE AND HEAT TRANSFER COEFFICIENTS