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Heat and Mass Transfer

, Volume 55, Issue 11, pp 3151–3164 | Cite as

Experimental investigation of convective heat transfer between corrugated heated surfaces of rectangular channel

  • Zuzana BrodnianskaEmail author
Original
  • 81 Downloads

Abstract

The convective heat transfer between corrugated heat transfer surfaces in the rectangular channel have been investigated experimentally. The optical measurement technique of holographic interferometry is used to visualize the temperature fields between heat transfer surfaces. Studies were carried out for the triangular, trapezoidal and wing corrugated heat transfer surfaces, comparing them to a smooth surface. The cooling air is sucked in between heated surfaces at different flow rates of 5, 10, 15 and 20 m3/h, which corresponds to the Reynolds numbers in the 732 to 3,020 range. The wall temperature was held constant at 318.15 K. The effects of the different corrugated channels and different heights of the gaps between heated surfaces (H = 40, 50 mm) and Reynolds numbers on heat transfer characteristics are discussed. Experiments were performed to determine local and mean heat transfer coefficients, Nusselt numbers, ratio j/f and thermal performance η. The results showed that the trapezoidal offset with 40 mm gap height and the Reynolds number Re = 3,020 achieved the highest values of mean Nusselt numbers (Nu = 26.97) in comparison with smooth and other corrugated channels. The mean Nusselt number Nu with raising of Re increased by 102 % for trapezoidal offset with gap H = 0.04 m. When considering heat transfer and pressure drop in the channel (ratio j/f), the trapezoidal offset with gap H = 0.05 m (j/f = 0.0104) is the most optimal case.

Abbreviations

Roman symbols

A

cross sectional area (m2)

D

diameter (m)

f

friction factor (non-dimensional)

H

height of the gap between heated surfaces (m)

h

height of the gap between peaks of heated surfaces (m)

j

Colburn factor (non-dimensional)

K

Gladstone-Dale constant (m3/kg)

L

length (m)

Nu

Nusselt number (non-dimensional)

n

refractive index (non-dimensional)

Pr

Prandtl number (non-dimensional)

ps

static pressure (Pa)

\( \dot{Q} \)

heat transfer rate (W)

Q

flow rate (m3/s)

Re

Reynolds number (non-dimensional)

s

interference order (non-dimensional)

T

temperature (K)

v

velocity of fluid (m/s)

W

width of the heated surfaces (m)

x,y,z

coordinates (m)

Greek symbols

α

heat transfer coefficient (W/m2.K)

Δ

difference of values (non-dimensional)

η

thermal performance (non-dimensional)

λ

thermal conductivity coefficient (W/(m.K)

ν

kinematic viscosity of fluid (m2/s)

ρ

density of fluid (kg/m3)

Subscripts

f

fluid

hyd

hydraulic

IF

interference fringe

in

inlet value

m

mean value

out

outlet value

s

surface

sm

smooth

x

local value

Notes

Acknowledgements

The contribution was created within the project VEGA 1/0086/18 The Research of Temperature Fields in the System of Shaped Heat Transfer Surfaces funded by the Ministry of Education, Science, Research, and Sport of the Slovak Republic.

Compliance with standards

Competing interests

The author declare that there is no conflict of interests regarding the publication of this paper.

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Copyright information

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

Authors and Affiliations

  1. 1.Faculty of Environmental and Manufacturing TechnologyTechnical University in ZvolenZvolenSlovak Republic

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