Thermo-Fluidic Modelling of a Heat Exchanger Tube with Conical Shaped Insert having Protrusion and Dimple Roughness


  • Bhanu Pratap Singh Uttarakhand Technical University
  • Vijay Singh Bisht Uttarakhand Technical University
  • Prabhakar Bhandari NIT Uttarakhand
  • K.S Rawat MIET, Meerut



Computational fluid dynamics, Heat Exchanger, Conical insert, Dimple shaped roughness, Protrusion roughness


In the present work, thermo-fluidic behavior of a heat exchanger tube with conical shaped insert has been investigated with the help of finite volume method. To enhance the heat transfer rate, two different types of roughness has been used in conical insert i.e. protrusion and dimple roughness. A three-dimensional computational model with  RNG turbulence model is used for the simulation and it has been performed for three different diameters (3 mm, 6 mm and 9 mm) and two different pitch space (120 mm and 180 mm) for both protrusion and dimple roughness. The present model has been validated with Dittus-Boelter equation and with Blasius equation for Nusselt number and friction factor, respectively. For a constant heat flux of 1200 W/m2, effect of roughness, diameter and pitch on Nusselt number and friction factor has been predicted for Reynold number range of 5000 to 30000. From the result, it is found that, the protrusion shaped roughness has better thermal performance factor than dimple shape and diameter of 6 mm has performed better than 3 mm and 9 mm for both the cases of roughness due to favorable flow dynamics.


Rashidi S, Hormozi F, Sundén B, Mahian O. Energy saving in thermal energy systems using dimpled surface technology–A review on mechanisms and applications. Applied Energy. 2019, 15;250:1491-547.

Bhandari P, Varshney L, Bisht VS. Numerical analysis of hybrid solar water heating system using wire screen packed solar air heater. In1st International conference on new frontiers in engineering, science & technology 2018 (Vol. 1, pp. 415-1422).

Varshney L, Bhandari P, Bisht VS. Performance Evaluation of Hybrid Solar Water Heating System Using Wire Screen Packed Solar Air Heater. Int. Journal of Engineering Research and Application (IJERA). 2014:311-6.

Mohammed HA, Abuobeida IA, Vuthaluru HB, Liu S. Two-phase forced convection of nanofluids flow in circular tubes using convergent and divergent conical rings inserts. International Communications in Heat and Mass Transfer. 2019,101:10-20.

Kumar N, Singh P, Redhewal AK, Bhandari P. A review on nanofluids applications for heat transfer in micro-channels. Procedia Engineering. 2015,127:1197-202.

Thianpong C, Eiamsa-Ard P, Eiamsa-Ard S. Heat transfer and thermal performance characteristics of heat exchanger tube fitted with perforated twisted-tapes. Heat and Mass Transfer. 2012, 48(6):881-92.

Eiamsa-ard, S.: Study on thermal and fluid flow characteristics in turbulent channel flows with multiple twisted tape vortex generators. International Communications in Heat and Mass Transfer, 31, 644–651 (2010).

Murugesan, P.A., Mayilsamy, K.B., Suresh, S.C., Srinivasan, P. S. S.: Heat Transfer And Pressure Drop Characteristics Of Turbulent Flow in a tube fitted with Trapezoidal-Cut Twisted Tape Insert, International Journal Of Academic Research,1, LCC: TJ255-265 UDC: 621.839(2009).

Murugesan, P.A., Mayilsamy, K.B., Suresh, S.C.: Heat Transfer and Friction Factor in a Tube Equipped with U-cut Twisted Tape Insert. Jordan Journal of Mechanical and Industrial Engineering, 5(6),559 –565(2011).

Promvonge, P.:Thermal augmentation in circular tube with twisted tape and wire coil turbulators. Energy Conversion and Management, 49, 2949–2955, (2008).

Eiamsa-ard, S.A., Nivesrangsan, P. A., Chokphoemphun, S.B., Promvonge, P.: Influence of combined non-uniform wire coil and twisted tape inserts on thermal performance characteristics. International Communications in Heat and Mass Transfer, 37, 850–856(2010).

Arulprakasajothi, M., Elangovan, K., Hema Chandra Reddy, K., Suresh, S.: Experimental investigation on heat transfer effect on conical strip inserts in a circular tube under laminar flow. Front. Energy, 10: 136, (2016).

Durmus, A.: Heat transfer and exergy loss in cut out conical turbulators. Energy Convers. Manage. 45, 785-796 (2004).

P. Promvonge, P.,Eiamsa-ard,S.: Heat transfer behaviors in a tube with combined conical-ring and twisted-tape insert. Int. Commun. Heat Mass Transfer 34, 849-859 (2007).

Promvonge, P.: Heat transfer behaviors in round tube with conical ring inserts, Energy Conversion and Management 49, 8 – 15, (2008).

K. Nanan a, C. Thianpong b, P. Promvonge b, S. Eiamsa-ard, Investigation of heat transfer enhancement by perforated helical twisted-tapes, International Communications in Heat and Mass Transfer 52 (2014) 106–112

Y. He, L. Liu, P. Li, L. Ma, Experimental study on Heat transfer enhancement characteristics of tube with cross hollow twisted tape inserts, Applied Thermal Engineering (2017),

B. P. Singh, V. S. Bisht, P. Bhandari, Numerical Study of Heat Exchanger Having Protrusion and Dimple Roughened Conical Ring Inserts, in Advances in Fluid and Thermal Engineering, Sikarwar B. S., Sundén B., Wang Q. (eds), Lecture Notes in Mechanical Engineering. Eds., Singapore: Springer Publishing pp. 151-161, 2021




How to Cite

Singh, B. P. ., Bisht, V. S. ., Bhandari, P. ., & Rawat, K. (2021). Thermo-Fluidic Modelling of a Heat Exchanger Tube with Conical Shaped Insert having Protrusion and Dimple Roughness. Aptisi Transactions on Technopreneurship (ATT), 3(2), 13–29.