An experimental investigation of heat transfer on the annular side of helically coiled double pipe heat exchangers

dc.contributor.authorNaess, E.
dc.date.accessioned2014-12-10T06:34:14Z
dc.date.available2014-12-10T06:34:14Z
dc.date.issued2008
dc.description.abstractPaper presented at the 6th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 30 June - 2 July, 2008.en_ZA
dc.description.abstractDespite its industrial importance, data on single phase heat transfer in helically coiled annular ducts are lacking. The present work present experimental data on average heat transfer coefficients for four annular-coil geometries, covering the laminar, transition and turbulent flow regimes, spanning the range 700 < Re < 2,5·104 and 4 < Pr < 13. The effect of the centrifugal forces due to the coil curvature was evident, enhancing the heat transfer significantly in the laminar and transition regions. In the turbulent flow regime, the effects of curvature on heat transfer were small. Laminar flow was stabilized by secondary flow motion, shifting the transition to turbulence to higher Re. Heat transfer correlations were developed, taking into consideration the asymptotic behavior at high and low Re. The correlation reproduced 80% of the data to within ±15%.en_ZA
dc.description.librarianvk2014en_ZA
dc.format.extent7 pagesen_ZA
dc.format.mediumPDFen_ZA
dc.identifier.citationNaess E 2008, An experimental investigation of heat transfer on the annular side of helically coiled double pipe heat exchangers, Paper presented to the 6th International Conference on Heat Transfer, Fluid Mechanics and Thermodynamics, South Africa, 30 June - 2 July 2008.en_ZA
dc.identifier.isbn9781868546916
dc.identifier.urihttp://hdl.handle.net/2263/42902
dc.language.isoenen_ZA
dc.publisherInternational Conference on Heat Transfer, Fluid Mechanics and Thermodynamicsen_ZA
dc.relation.ispartofHEFAT 2008en_US
dc.rightsUniversity of Pretoriaen_ZA
dc.subjectHeat transferen_ZA
dc.subjectAnnular side of helically coiled double pipe heat exchangersen_ZA
dc.subjectDouble pipe heat exchangeren_ZA
dc.subjectHeat transfer coefficienten_ZA
dc.subjectLaminar flow regimesen_ZA
dc.subjectTurbulent flow regimesen_ZA
dc.subjectCentrifugal forced due to coil curvatureen_ZA
dc.subjectReynolds numberen_ZA
dc.titleAn experimental investigation of heat transfer on the annular side of helically coiled double pipe heat exchangersen_ZA
dc.typePresentationen_ZA

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