A numerical study on heat transfer and friction factor characteristics of laminar flow in a circular tube fitted with center-cleared twisted tape

Abstract Twisted tape is a widely used technique for heat transfer enhancement. In the present paper, we proposed a center-cleared twisted tape aiming at acxhieving good thermohydraulic performance. A comparative study between this type and the short-width twisted tape was performed numerically in laminar tubular flows. The computation results demonstrated that the flow resistance can be reduced by both methods; however, the thermal behaviors are very different from each other. For tubes with short-width twisted tapes, the heat transfer and thermohydraulic performance are weakened by cutting off the tape edge. Contrarily, for tubes with center-cleared twisted tapes, the heat transfer can be even enhanced in the cases with a suitable central clearance ratio. The thermal performance factor of the tube with center-cleared twisted tape can be enhanced by 7–20% as compared with the tube with conventional twisted tape. All these demonstrated that the center-cleared twisted tape is a promising technique for laminar convective heat transfer enhancement.

[1]  Ventsislav D. Zimparov,et al.  Enhancement of heat transfer by a combination of a single-start spirally corrugated tubes with a twisted tape , 2002 .

[2]  Masoud Rahimi,et al.  Experimental and CFD studies on heat transfer and friction factor characteristics of a tube equipped with modified twisted tape inserts , 2009 .

[3]  Pongjet Promvonge,et al.  Heat transfer behaviors in a tube with combined conical-ring and twisted-tape insert ☆ , 2007 .

[4]  S. Martemianov,et al.  On heat transfer enhancement in swirl pipe flows , 2004 .

[5]  Qiang Liao,et al.  Augmentation of convective heat transfer inside tubes with three-dimensional internal extended surfaces and twisted-tape inserts , 2000 .

[6]  Shyy Woei Chang,et al.  Turbulent heat transfer and pressure drop in tube fitted with serrated twisted tape , 2007 .

[7]  Abhijit Date,et al.  Friction and heat transfer characteristics of flow through square duct with twisted tape insert , 2003 .

[8]  U. N. Gaitonde,et al.  Heat transfer and pressure drop characteristics of turbulent flow in a circular tube fitted with regularly spaced twisted-tape elements , 1990 .

[9]  Pongjet Promvonge,et al.  Thermal characteristics in round tube fitted with serrated twisted tape , 2010 .

[10]  Ralph L. Webb,et al.  Performance evaluation criteria for use of enhanced heat transfer surfaces in heat exchanger design , 1981 .

[11]  S. Suresh,et al.  Experimental studies on heat transfer and friction factor characteristics of turbulent flow through a circular tube fitted with helical screw-tape inserts , 2007 .

[12]  Pongjet Promvonge,et al.  Experimental investigation of heat transfer and flow friction in a circular tube fitted with regularly spaced twisted tape elements , 2006 .

[13]  Animesh Dutta,et al.  Friction and heat transfer characteristics of laminar swirl flow through a circular tube fitted with regularly spaced twisted-tape elements , 2001 .

[14]  Smith Eiamsa-ard,et al.  3-D Numerical simulation of swirling flow and convective heat transfer in a circular tube induced by means of loose-fit twisted tapes☆ , 2009 .

[15]  R. M. Manglik,et al.  Heat Transfer and Pressure Drop Correlations for Twisted-Tape Inserts in Isothermal Tubes: Part I—Laminar Flows , 1993 .

[16]  S. F. Al-Fahed,et al.  The effect of gap width between horizontal tube and twisted tape on the pressure drop in turbulent water flow , 1993 .

[17]  V. Zimparov,et al.  Enhancement of heat transfer by a combination of three-start spirally corrugated tubes with a twisted tape , 2001 .

[18]  K. N. Sheeba,et al.  Experimental studies on heat transfer and friction factor characteristics of thermosyphon solar water heater system fitted with spacer at the trailing edge of twisted tapes , 2009 .

[19]  A. W. Date,et al.  Laminar Flow and Heat Transfer through Square Duct with Twisted Tape Insert , 2001 .

[20]  Shyy Woei Chang,et al.  Heat transfer and pressure drop in tube with broken twisted tape insert , 2007 .

[21]  Mechanism of Heat Transfer Enhancement in the Core Flow of a Tube and Its Numerical Simulation , 2010 .

[22]  S. Suresh,et al.  Experimental studies on heat transfer and friction factor characteristics of laminar flow through a circular tube fitted with helical screw-tape inserts , 2006 .

[23]  R. M. Manglik,et al.  Heat Transfer and Pressure Drop Correlations for Twisted-Tape Inserts in Isothermal Tubes: Part II—Transition and Turbulent Flows , 1993 .