Advertisement

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
Original
  • 80 Downloads

Abstract

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.

Keywords

Slot dimple Spherical/elliptical dimple Heat transfer enhancement Thermal performance 

Nomenclature

A

heat transfer area, m2

a

dimple width, mm

b

dimple length, mm

cp

special heat, Jkg−1 K−1

D

dimple depth, mm

Dh

equivalent diameter, mm

ETSD

enhanced tube with slot dimples

f

friction factor

P

dimple pitch, mm

Pr

Prandtl number

p

pressure, Pa

∆p

pressure drop, Pa

PEC

overall thermal performance evaluation criterion

L

Length of test tube, m

mass flow rate, kgs−1

Nu

Nusselt number

R

ratio of a and b

r

dimple radius

Re

Reynolds number

T

temperature, K

u

velocity, ms−1

uT

friction velocity

y

distance from the wall, m

y+

mesh resolution indicator

Greek symbols

ρ

fluid density, kgm−3

μ휇

dynamic viscosity, Pas

λ

thermal conductivity, Wm−1 K−1

β

average pressure gradient

Ф

total heat rate, W

Subscripts

i

inside

max

maximum

0

smooth tube

Ref

reference

Notes

Acknowledgements

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

References

  1. 1.
    Ji W, Jacobi AM, He Y, Tao W (2017) Summary and evaluation on the heat transfer enhancement techniques of gas laminar and turbulent pipe flow. Int J Heat Mass Transf 111:467–483CrossRefGoogle Scholar
  2. 2.
    Sheikholeslami M, Gorji-Bandpy M, Ganji DD (2015) Review of heat transfer enhancement methods: Focus on passive methods using swirl flow devices. Renew Sustain Energy Rev 49:444–469CrossRefGoogle Scholar
  3. 3.
    García A, Solano JP, Vicente PG, Viedma A (2012) The influence of artificial roughness shape on heat transfer enhancement: Corrugated tubes, dimpled tubes and wire coils. Appl Therm Eng 35:196–201CrossRefGoogle Scholar
  4. 4.
    Leontiev AI, Kiselev NA, Burtsev SA, Strongin MM, Vinogradov YA (2016) Experimental investigation of heat transfer and drag on surfaces with spherical dimples. Exp Thermal Fluid Sci 79:74–84CrossRefGoogle Scholar
  5. 5.
    Huang Z, Yu GL, Li ZY, Tao WQ (2015) Numerical Study on Heat Transfer Enhancement in a Receiver Tube of Parabolic Trough Solar Collector with Dimples, Protrusions and Helical Fins. Energy Procedia 69:1306–1316CrossRefGoogle Scholar
  6. 6.
    Isaev SA, Schelchkov AV, Leontiev AI, Gortyshov YF, Baranov PA, Popov IA (2017) Vortex heat transfer enhancement in the narrow plane-parallel channel with the oval-trench dimple of fixed depth and spot area. Int J Heat Mass Transf 109:40–62CrossRefGoogle Scholar
  7. 7.
    Kumar A, Maithani R, Suri ARS (2017) Numerical and experimental investigation of enhancement of heat transfer in dimpled rib heat exchanger tube. Heat Mass Transf 53:3501–3516CrossRefGoogle Scholar
  8. 8.
    Huang Z, Li Z, Yu G, Tao W (2017) Numerical investigations on fully-developed mixed turbulent convection in dimpled parabolic trough receiver tubes. Appl Therm Eng 114:1287–1299CrossRefGoogle Scholar
  9. 9.
    Wang Y, He Y, Lei Y, Li R (2009) Heat Transfer and Friction Characteristics for Turbulent Flow of Dimpled Tubes. Chem eng technol 32:956–963CrossRefGoogle Scholar
  10. 10.
    Wang Y, He Y, Lei Y, Zhang J (2010) Heat transfer and hydrodynamics analysis of a novel dimpled tube. Exp Thermal Fluid Sci 34:1273–1281CrossRefGoogle Scholar
  11. 11.
    Kumar P, Kumar A, Chamoli S, Kumar M (2016) Experimental investigation of heat transfer enhancement and fluid flow characteristics in a protruded surface heat exchanger tube. Exp Thermal Fluid Sci 71:42–51CrossRefGoogle Scholar
  12. 12.
    Li M, Khan TS, Al-Hajri E, Ayub ZH (2016) Single phase heat transfer and pressure drop analysis of a dimpled enhanced tube. Appl Therm Eng 101:38–46CrossRefGoogle Scholar
  13. 13.
    Guo S, Wu Z, Li W, Kukulka D, Sundén B, Zhou X, Wei J, Simon T (2015) Condensation and evaporation heat transfer characteristics in horizontal smooth, herringbone and enhanced surface EHT tubes. Int J Heat Mass Transf 85:281–291CrossRefGoogle Scholar
  14. 14.
    Shafaee M, Mashouf H, Sarmadian A, Mohseni SG (2016) Evaporation heat transfer and pressure drop characteristics of R-600a in horizontal smooth and helically dimpled tubes. Appl Therm Eng 107:28–36CrossRefGoogle Scholar
  15. 15.
    Aroonrat K, Wongwises S (2018) Condensation heat transfer and pressure drop characteristics of R-134a flowing through dimpled tubes with different helical and dimpled pitches. Int J Heat Mass Transf 121:620–631CrossRefGoogle Scholar
  16. 16.
    Chen J, Li W (2018) Local flow boiling heat transfer characteristics in three-dimensional enhanced tubes. Int J Heat Mass Tran 121:1021–1032CrossRefGoogle Scholar
  17. 17.
    Solanki AK, Kumar R (2018) Condensation of R-134a inside dimpled helically coiled tube-in-shell type heat exchanger. Appl Therm Eng 129:535–548CrossRefGoogle Scholar
  18. 18.
    Li R, He Y, Lei YG, Tao YB, Chu P (2009) A numerical study on fluid flow and heat transfer performance of internally roughened tubes with dimples on thermal-hydraulic performance. J enhance heat tran 16:267–285CrossRefGoogle Scholar
  19. 19.
    Sobhani M, Behzadmehr A (2018) Investigation of thermo-fluid behavior of mixed convection heat transfer of different dimples-protrusions wall patterns to heat transfer enhancement. Heat Mass Transf:1–11Google Scholar
  20. 20.
    Xie S, Liang Z, Zhang L, Wang Y (2018) A numerical study on heat transfer enhancement and flow structure in enhanced tube with cross ellipsoidal dimples. Int J Heat Mass Transf 125:434–444CrossRefGoogle Scholar
  21. 21.
    Zheng N, Liu W, Liu Z, Liu P, Shan F (2015) A numerical study on heat transfer enhancement and the flow structure in a heat exchanger tube with discrete double inclined ribs. Appl Therm Eng 90:232–241CrossRefGoogle Scholar
  22. 22.
    Zheng L, Zhang D, Xie Y, Xie G (2016) Thermal performance of dimpled/protruded circular and annular microchannel tube heat sink. J Taiwan Inst Chem Eng 60:342–351CrossRefGoogle Scholar
  23. 23.
    Xie S, Liang Z, Zhang L, Wang Y, Ding H, Zhang J (2018) Numerical investigation on heat transfer performance and flow characteristics in enhanced tube with dimples and protrusions. Int J Heat Mass Transf 122:602–613CrossRefGoogle Scholar
  24. 24.
    Liu J, Chen S, Gan M, Chen Q (2018) Heat Transfer and Flow Resistance characteristics inside an Innovative Vortex Enhanced Tube. Appl Therm Eng 12:120–150Google Scholar
  25. 25.
    Sheikholeslami M, Ganji DD (2017) Numerical analysis of nanofluid transportation in porous media under the influence of external magnetic source, Journal of molecular liquids, 499–507CrossRefGoogle Scholar
  26. 26.
    Liang Z, Xie S, Zhang L, Zhang J, Wang Y, Yin Y (2017) Influence of geometric parameters on the thermal hydraulic performance of an ellipsoidal protruded enhanced tube. Numer Heat Tr A-Appl 72:153–170CrossRefGoogle Scholar
  27. 27.
    Xie Y, Qu H, Zhang D (2015) Numerical investigation of flow and heat transfer in rectangular channel with teardrop dimple/protrusion. Int J Heat Mass Transf 84:486–496CrossRefGoogle Scholar
  28. 28.
    Petukhov B (1970) Heat transfer and friction in turbulent pipe flow with variable physical properties, Adv. heat transfer i565Google Scholar
  29. 29.
    Dittus LMKBFW (1985) Heat transfer in automobile radiators of the tubular type. Int Commun Heat Mass 12:3–22CrossRefGoogle Scholar
  30. 30.
    Zheng N, Liu P, Shan F, Liu Z, Liu W (2017) Turbulent flow and heat transfer enhancement in a heat exchanger tube fitted with novel discrete inclined grooves. Int J Therm Sci 111:289–300CrossRefGoogle Scholar
  31. 31.
    Li M, Khan TS, Al Hajri E, Ayub ZH (2016) Geometric optimization for thermal-hydraulic performance of dimpled enhanced tubes for single phase flow. Appl Therm Eng 103:639–650CrossRefGoogle Scholar

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

Personalised recommendations