Abstract
A twisted tape is inserted into a double pipe u-tube heat exchanger with a view to generate swirl flow, thereby enhancing the heat transfer rate of the fluids flowing in it. Experimental investigations of heat transfer enhancement and variation of friction factor have been presented for a typical test section of a u-tube double pipe heat exchanger involving a circular tube filled with a full length insert. The flow is under forced convection with Reynolds Number varying from 3,000 to 31,000. From the experimental data, heat transfer coefficient, friction factor, and thermal performance with the twisted tape inserts were calculated and compared with the plain tube data. The results show that there were a significant increase in heat transfer coefficient, friction factor, and it was found that the thermal Performance of smooth tube is better than the full length twisted tape by 2.0–2.2 times.
This is a preview of subscription content, log in via an institution.
Buying options
Tax calculation will be finalised at checkout
Purchases are for personal use only
Learn about institutional subscriptionsAbbreviations
- A :
-
Area of heat transfer m2
- d i :
-
Inside tube diameter, m
- d 0 :
-
Outside tube diameter, m
- D :
-
Twist diameter of inserted tape, m
- H/D:
-
Twist ratio = Pitch/twist diameter
- L 1 :
-
Length of heat transfer test section, m
- L 2 :
-
Length of pressure drop test section, m
- Δp :
-
Pressure drop, kg/m2
- m :
-
Mass flow rate, kg/sec
- Q :
-
Rate of heat transfer, W
- C p :
-
Specific heat of fluid, KJ/kg-K
- Thi, Tho:
-
Inlet and outlet temperature of hot fluid, °C
- Tci, Tco:
-
Inlet and outlet temperature of cold fluid, °C
- h i :
-
Inside heat transfer coefficient, W/m2 − k
- h o :
-
Out side heat transfer coefficient, W/m2 − k
- ΔT LMTD :
-
Log mean temperature difference, °C
- Re:
-
Reynolds Number
- Pr:
-
Prandtl Number
- Nu:
-
Nusselt Number
- K :
-
Thermal conductivity of fluid, W/m − k
- f :
-
Friction factor
- U :
-
Overall heat transfer coefficient, W/m2 − k
References
Hong SW, Bergles AE (1976) Augmentation of laminar flow heat transfer in tube by means of twist tape insert. J Heat Transf, Trans ASME 98(2):251–256
Eiamsa-ard S, Thianpong C, Promvonge P (2006) Experimental Investigation of heat transfer and flow friction in a circular tube fitted with regularly spaced twisted tape elements. Intl Commun Heat Mass Transf 33:1225–1233
Bergles AE (1995) Techniques to augment heat transfer readings. Hand book of heat transfer applications, Chap. 3. McGraw Hill, NewYork
Ahmed M, Deju L, Sarkar MAR, Islam SMN (2005) Heat transfer in turbulent flow through a circular tube with twisted tape inserts. Proc Intl Conf on Mech Eng (ICME2005)
Dewan A, Mahanta P, Sumithra Raju K, Suresh Kumar P (2004) Review of passive heat transfer augmentation techniques. J Power Energy 218:509–525
Yadav AS (2008) Experimental investigation of heat transfer performance of double pipe U-bend heat exchanger using full length twisted tape. Int J Appl Eng Res (IJAER) 3(3):399–407
Naphon P (2006) Heat transfer and pressure drop in the horizontal double pipes with and without twisted tape insert, Intl Commun Heat Mass Transf 33:166–175
Saha SK, Gaitonde UN, Date AW (1989) Heat transfer and pressure drop characteristics of laminar flow through a circular tube fitted with regularly spaced twisted tape elements with multiple twists. Exp Therm Fluid Sci 2(3):310–322
Dittus FW, Boelter LMK (1930) Univ Calif Pub Eng, Berkely, vol 2 p 443
Petukhov BS (1970) Heat transfer and friction in turbulent pipe flow with variable physical properties. In: Hartnett JP, Irvine TF (eds) Advances in heat transfer, Academic Press, New York, pp 504–564
Blasius H (1908) Grenzschichten in Flussigkeiten mit kleiner Reibung (German). Z Math Phys 56:1–37
Author information
Authors and Affiliations
Corresponding author
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 2012 Springer India
About this paper
Cite this paper
Durga Prasad, P.V., Gupta, A.V.S.S.K.S. (2012). Augmentation of Heat Transfer and Pressure Drop Characteristics Inside a Double Pipe U-Tube Heat Exchanger by Using Twisted Tape Inserts. In: Sathiyamoorthy, S., Caroline, B., Jayanthi, J. (eds) Emerging Trends in Science, Engineering and Technology. Lecture Notes in Mechanical Engineering. Springer, India. https://doi.org/10.1007/978-81-322-1007-8_3
Download citation
DOI: https://doi.org/10.1007/978-81-322-1007-8_3
Published:
Publisher Name: Springer, India
Print ISBN: 978-81-322-1006-1
Online ISBN: 978-81-322-1007-8
eBook Packages: EngineeringEngineering (R0)