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

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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.

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Abbreviations

A :

heat transfer area, m2

a :

dimple width, mm

b :

dimple length, mm

c p :

special heat, Jkg−1 K−1

D :

dimple depth, mm

D h :

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

ṁ :

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

u T :

friction velocity

y :

distance from the wall, m

y + :

mesh resolution indicator

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

i :

inside

max :

maximum

0 :

smooth tube

Ref :

reference

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Acknowledgements

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

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Authors and Affiliations

  1. School of Mechatronic Engineering, Southwest Petroleum University, Chengdu, Sichuan, 610500, People’s Republic of China

    Liang Zhang, Shuai Xie, Zheng Liang & Jie Zhang

  2. Si Chuan Chuan Guo Ketaida Energy Technology Co., Ltd, Chengdu, Sichuan, 610500, People’s Republic of China

    Yulin Wang & Wei Chen

  3. School of Mechanical Engineering, Xihua University, Chengdu, Sichuan, 610500, People’s Republic of China

    Chunyan Kong

Authors
  1. Liang Zhang
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  2. Shuai Xie
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  4. Jie Zhang
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  5. Yulin Wang
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  6. Wei Chen
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  7. Chunyan Kong
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Correspondence to Shuai Xie.

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Zhang, L., Xie, S., Liang, Z. et al. Numerical investigation of flow and heat transfer in enhanced tube with slot dimples. Heat Mass Transfer 55, 3697–3709 (2019). https://doi.org/10.1007/s00231-019-02685-z

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