Heat transfer enhancement of shell-and-coiled tube heat exchanger utilizing helical wire turbulator

•Helical wire is inserted into a helical tube as a turbulator via an especial method.•The effects of turbulator are studied through a shell-coiled tube heat exchanger.•Thermal and frictional behaviors of coiled tube with turbulator are evaluated.•Effectiveness and NTU are investigated too for heat e...

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Veröffentlicht in:Applied thermal engineering 2017-03, Vol.115, p.607-615
Hauptverfasser: Panahi, Davood, Zamzamian, Kamiar
Format: Artikel
Sprache:eng
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Zusammenfassung:•Helical wire is inserted into a helical tube as a turbulator via an especial method.•The effects of turbulator are studied through a shell-coiled tube heat exchanger.•Thermal and frictional behaviors of coiled tube with turbulator are evaluated.•Effectiveness and NTU are investigated too for heat exchanger.•It is possible to employ a turbulator for helical tubes for improving heat transfer rate. In present study, a shell and coiled tube heat exchanger is experimentally studied in which a helical wire has been placed inside the helically coiled tube as a turbulator. The fabrication method of helically coiled tube which contains turbulator and also the effects of turbulator on thermal and frictional characteristics of heat exchanger are presented in this paper. Experiments were performed in two main modes. In first mode, the fluid of coiled tube was water and in second mode the fluid of coiled tube was air. Each mode was studied for both empty coiled tube (without turbulator) and with turbulator under different fluid flow rates. The fluid of shell side was hot water for all cases. Findings showed that this type of turbulator can be employed in coiled tubes which significantly increased the overall heat transfer coefficient and obviously pressure drop. Overall heat transfer coefficient, pressure drop, effectiveness and NTU are evaluated and discussed.
ISSN:1359-4311
1873-5606
DOI:10.1016/j.applthermaleng.2016.12.128