Heat transfer and pressure drop studies in a circular tube fitted with straight full twist

Experimental investigation of heat transfer characteristics of circular tube fitted with straight full twist insert has been presented. The heat transfer coefficient increases with Reynolds number and decreasing spacer distance with maximum being 2 in. spacer distance for both the type of twist inserts. Also, there is no appreciable increase in heat transfer enhancement in straight full twist insert with 2 in. spacer distance. Experiments were carried out in turbulent flow using straight full twist insert with 4 in. spacer and similar trend of increasing Nusselt number with Reynolds number was observed. Performance evaluation analysis was made and the maximum performance ratio was obtained for each twist insert corresponding to the Reynolds number of 2550.

[1]  W. Rohsenow,et al.  Handbook of heat transfer applications , 1985 .

[2]  Arthur E. Bergles,et al.  Some perspectives on enhanced heat transfer: second-generation heat transfer technology , 1988 .

[3]  S. W. Hong,et al.  Augmentation of Laminar Flow Heat Transfer in Tubes by Means of Twisted-Tape Inserts , 1974 .

[4]  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 .

[5]  P. K. Nagarajan,et al.  EXPERIMENTAL STUDIES ON HEAT TRANSFER AND FRICTION FACTOR CHARACTERISTICS OF TURBULENT FLOW THROUGH A CIRCULAR TUBE FITTED WITH RIGHT AND LEFT HELICAL SCREW-TAPE INSERTS , 2008 .

[6]  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 .

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

[8]  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 .

[9]  Palani Sivashanmugam,et al.  Studies on heat transfer and friction factor characteristics of laminar flow through a circular tube fitted with right and left helical screw-tape inserts , 2007 .

[10]  A. Patil.  Laminar Flow Heat Transfer and Pressure Drop Characteristics of Power-Law Fluids Inside Tubes With Varying Width Twisted Tape Inserts , 2000 .

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

[12]  Pongjet Promvonge,et al.  Enhancement of heat transfer in a tube with regularly-spaced helical tape swirl generators , 2005 .

[13]  F. Landis,et al.  Friction and Forced Convection Heat-Transfer Characteristics in Tubes With Twisted Tape Swirl Generators , 1964 .

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

[15]  A. W. Date,et al.  Prediction of fully-developed flow in a tube containing a twisted-tape , 1974 .

[16]  A. Ferrero,et al.  Measurement uncertainty , 2006, IEEE Instrumentation & Measurement Magazine.

[17]  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 .

[18]  M. Raja Rao,et al.  Heat transfer augmentation for the flow of a viscous liquid in circular tubes using twisted tape inserts , 1996 .

[19]  W. Chakroun,et al.  The Effect of Twisted Tape Width on Heat Transfer and Pressure Drop for Fully Developed Laminar Flow , 1995 .

[20]  S. F. Al-Fahed,et al.  Pressure drop and heat transfer comparison for both microfin tube and twisted-tape inserts in laminar flow , 1998 .