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Pressure loss and heat transfer characteristics in a dimpled channel with crescent-shaped protrusion

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Abstract

Numerical simulations were conducted to study the flow and heat transfer characteristics of the dimpled channel with a protrusion. The protrusion was located upstream of the dimple to enhance the flow mixing inside the dimpled channel. The height of the protrusion, h, and the diameter of the protrusion, d, are the variables considered in the present study. The ratio of the height to the diameter of the protrusion, h/d, was varied in the range of 0.2 to 0.4. A direct numerical simulation (DNS) was performed with a Reynolds number of 2800 and a Prandtl number of 0.71 on a total 10 geometries, including a general dimpled surface. Flow and thermal characteristics were analyzed by the time-averaged flow and thermal fields and the local Nusselt number distribution according to the configurations of the dimpled channel. The normalized Fanning friction factor, f/f0, Colburn j factor, j/j0, and volume goodness factor, Gv/Gv0, were calculated to evaluate the performances according to the configurations of the dimpled channel in terms of the pressure drop, heat transfer rate, and compactness of the heat exchanger. The volume goodness factor, Gv, was 27% larger in the case of h = 0.2 and d = 1.0 (h/d = 0.20) than that of a general dimpled surface.

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Abbreviations

D :

dimensionless dimple-imprinted Diameter

D h :

hydraulic diameter of the channel

d :

dimensionless diameter of protrusion

f :

Fanning friction factor

G v :

volume goodness factor

H :

channel height

h :

dimensionless height of protrusion

j :

Colburn j factor

L :

length of computational domain

Nu:

Nusselt number

p :

dimensionless pressure

Pr:

Prandtl number

Re:

Reynolds number

St:

Stanton number

t :

dimensionless time

T :

dimensionless temperature

u :

dimensionless velocity vectors

W :

width of computational domain

x, y, z :

Cartesian coordinates

α :

thermal diffusivity

δ :

dimensionless dimple-imprinted depth

∆ :

grid spacing

ε :

turbulent dissipation rate

η :

Kolmogorov length scale

λ2 :

lamda-2 criteria for vortical structure

ν :

kinematic viscosity

ρ :

fluid density

Π:

dimensionless mean pressure gradient

0 :

general dimpled case

*:

dimensional quantity

+:

wall coordinate

–:

time-averaged quantity

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Acknowledgements

This work was supported by the Technology Innovation Program (No. 10076276, Development of E class vain component via 3D printing for energy plant applications) funded By the Ministry of Trade, Industry & Energy(MOTIE, Korea). This work was supported by Korea Institute of Energy Technology Evaluation and Planning(KETEP) grant funded by the Korea government(MOTIE) (20193310100050, Technology development of gas turbine blade reengineering specialized for domestic operating environment).

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Authors and Affiliations

  1. School of Mechanical Engineering, Pusan National University, 2, Busandaehak-ro 63beon-gil, Geumjeong-gu, Busan, 46241, South Korea

    Myunggeun Jeong & Man Yeong Ha

  2. School of Mechanical Engineering, Changwon National University, 20, Changwondaehak-ro, Uichang-gu, Changwon, 51140, South Korea

    Yong Gap Park

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  1. Myunggeun Jeong
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  2. Man Yeong Ha
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Correspondence to Man Yeong Ha or Yong Gap Park.

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Jeong, M., Ha, M.Y. & Park, Y.G. Pressure loss and heat transfer characteristics in a dimpled channel with crescent-shaped protrusion. Heat Mass Transfer 57, 1645–1659 (2021). https://doi.org/10.1007/s00231-021-03037-6

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