Heat and Mass Transfer

, Volume 55, Issue 12, pp 3697–3709 | Cite as

Numerical investigation of flow and heat transfer in enhanced tube with slot dimples

  • Liang Zhang
  • Shuai XieEmail author
  • Zheng Liang
  • Jie Zhang
  • Yulin Wang
  • Wei Chen
  • Chunyan Kong


In this paper, a novel enhanced tube with slot dimples aiming to improve heat transfer have been put forward. The flow and heat transfer characteristics of the enhanced tube with slot dimples (ETSD) were numerically analysed and compared with spherical/elliptical dimples. The distributions of temperature, velocity, pressure, Nusselt number and streamlines were carried out to describe the mechanism of heat transfer and fluid flow. Additionally, the effects of dimple depth, length and axis ratios on turbulent fluid flow and heat transfer performances were also being studied in details. It is found that the enhanced tube with slot dimples have an advantage for augmented heat transfer rate compared with the spherical/elliptical dimple tube due to the slot dimples generated greater swirling flow, better fluid mixing, and greater flow blockage. In addition, the slot dimples destroyed the boundary layer, intense flow mixing and formed periodic impinge flows, thus significant improved of thermal–hydraulic performance. The Nu/Nu0 and f/f0 for ETSD increases with the increasing of dimples depth, and decreases with increasing of pitch. The ETSD with D = 1.5 mm, P = 30 mm, R = 2.33 and Re = 5000 provided the largest PEC value about 2.02 in all the case.


Slot dimple Spherical/elliptical dimple Heat transfer enhancement Thermal performance 



heat transfer area, m2


dimple width, mm


dimple length, mm


special heat, Jkg−1 K−1


dimple depth, mm


equivalent diameter, mm


enhanced tube with slot dimples


friction factor


dimple pitch, mm


Prandtl number


pressure, Pa


pressure drop, Pa


overall thermal performance evaluation criterion


Length of test tube, m

mass flow rate, kgs−1


Nusselt number


ratio of a and b


dimple radius


Reynolds number


temperature, K


velocity, ms−1


friction velocity


distance from the wall, m


mesh resolution indicator

Greek symbols


fluid density, kgm−3


dynamic viscosity, Pas


thermal conductivity, Wm−1 K−1


average pressure gradient


total heat rate, W







smooth tube





This research work was supported by the Key Scientific Research Fund of Xihua University (No. Z17119-0303).


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.School of Mechatronic EngineeringSouthwest Petroleum UniversityChengduPeople’s Republic of China
  2. 2.Si Chuan Chuan Guo Ketaida Energy Technology Co., LtdChengduPeople’s Republic of China
  3. 3.School of Mechanical EngineeringXihua UniversityChengduPeople’s Republic of China

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