Experimental Investigation of Forced Convection Heat Transfer Enhancement in Dimpled Tube

  • Vilas P. Apet Mechanical Engineering, J. S. P. M’s Rajarshi Shahu College Of Engineering, Savitribai Phule Pune University, Pune, India
  • Sachin L. Borse Mechanical Engineering, J. S. P. M’s Rajarshi Shahu College Of Engineering, Savitribai Phule Pune University, Pune, India
DOI: http://dx.doi.org/10.36842/jomase.v35i1.402

Abstract

The development of high-performance thermal systems has stimulated interest in methods to improve heat transfer. Tubes with artificial roughness obtained by providing dimples on the tube surface are competitive in comparison to performance and cost of other enhanced techniques currently employed in turbulent flow. In this study forced convection heat transfer characteristics from dimpled tube has been investigated experimentally. The effect of variation in dimple diameter and dimple arrangement (inline and staggered) has been investigated for Reynolds No range 12000 to 26000 dimpled tube. Additionally the effect of variation in dimple tube and diameter on pressure drop across test section has also been investigated. This investigation was carried out to observe if the use of dimples on tube can enhance heat transfer characteristics without severe penalties associated with pressure drops for turbulent flow. The results show that heat transfer enhancement under forced convection can be achieved by using dimple tubes. The enhancement in convective heat transfer coefficient is observed as 18% and in Nusselt number as 22 % as compared with plain tube for same Reynolds number. The thermal performance factor values for the staggered dimpled array geometry were more than corresponding inline dimpled array geometry in the Reynolds number range studied .

##Keywords:## Dimple tube, Heat transfer enhancement, Forced convection, Thermal performance factor.
Published
Sep 30, 2016
How to Cite
APET, Vilas P.; BORSE, Sachin L.. Experimental Investigation of Forced Convection Heat Transfer Enhancement in Dimpled Tube. Journal of Ocean, Mechanical and Aerospace -science and engineering-, [S.l.], v. 35, n. 1, p. 1 - 6, sep. 2016. ISSN 2527-6085. Available at: <https://isomase.org/Journals/index.php/jomase/article/view/402>. Date accessed: 30 apr. 2026. doi: http://dx.doi.org/10.36842/jomase.v35i1.402.
Citation Formats
Issue
Vol 35 No 1 (2016): Journal of Ocean, Mechanical and Aerospace -science and engineering- (JOMAse)
Section
Articles

References

1. Turnow, J., Kornev, N., Zhdanov, V. and Hassel, E. (2012). Flow structures and heat transfer on dimples in a staggered arrangement, International Journal of Heat and Fluid Flow, vol 35, pp. 168–175.
2. Rao, Y., Wan, C. and Xu, Y. (2012). An experimental study of pressure loss and heat transfer in the pin fin-dimple channels with various dimple depths, International Journal of Heat and Mass Transfer, vol 55, pp. 6723–6733.
3. Bi, C., Tang, G. H. and Tao, W. Q. (2013). Heat transfer enhancement in mini-channel heat sinks with dimples and cylindrical grooves, Applied Thermal Engineering, 2013, 55, pp. 121-132.
4. Isaev, S. A., Kornev, N. V. and Leontiev, A. L. (2010). Influence of the Reynolds number and the spherical dimple depth on turbulent heat transfer and hydraulic loss in a narrow channel, International Journal of Heat and Mass Transfer, vol. 53, pp.178-197.
5. Lee, J. and Lee, K., (2013). Correlations and shape optimization in a channel with aligned dimples and protrusions, International Journal of Heat and Mass Transfer, vol. 64, pp.444-451.
6. Shin, S., Lee, K. S., Park, S. D. and Kwak,J. S. (2009). Measurement of the heat transfer coefficient in the dimpled channel: effects of dimple arrangement and channel height, Journal of Mechanical Science and Technology, vol 23, pp.624-630.
7. Chen, Y., Chew, Y. T. and Khoo B. C. (2012) Enhancement of heat transfer in turbulent channel flow over dimpled surface, International Journal of Heat and Mass Transfer, vol 55, pp.8100-8121.