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Enhancement of condensation heat transfer at aluminum surfaces via laser-induced surface roughening

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Abstract

In this paper, condensation on plates with different rough-surface geometries has been experimentally investigated, and compared with smooth plates. The surface roughness on all plates was produced through laser marking with similar operational parameters of the device, and the roughened area on each plate was measured. The generated roughness on the plates was then examined through SEM images. Then, the values of heat flux and heat transfer coefficient were measured at different temperatures, according to the differences in the geometry of roughness generated on each plate, and compared. Investigation of the SEM images showed that the roughness created on the plates was in the form of cavities, with the mean diameter and depth of 50 and 5 µm, respectively. The cavities were identical all through the roughened zones, despite the different geometries of the roughened surfaces on the plates. The obtained results revealed that the geometry and area of roughened zones on the plate were effective parameters in the measured values of heat transfer coefficient and heat flux, meaning that their combined effects might lead to an increase in heat flux and heat transfer coefficient values.

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Abbreviations

A :

Condensing surface area (m2)

C p,l :

Specific heat of water (J/kg °C)

\(\dot{m}\) :

Mass flow rate of water in condenser (kg/s)

HTC:

Heat transfer coefficient (W/m2 °C)

h fg :

Latent heat of vaporization (J/kg)

Δl :

Distance (m)

M :

Mass of condensate from the test plate (kg)

Q :

Heat transfer rate (W)

q :

Heat flux (W/m2)

t :

Experimental time (s)

T i :

Thermocouple position temperature (°C)

T in :

Inlet water temperature (°C)

T out :

Outlet water temperature (°C)

T s :

Steam temperature (°C)

T w :

Surface temperature (°C)

u A :

Type-A uncertainty (%)

u B :

Type-B uncertainty (%)

u C :

Combined uncertainty (%)

u M :

Expanded uncertainty (%)

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Acknowledgements

The authors would like to thank the members of the Institute of Applied Hydrodynamics and Marine Technology of Iran University of Science and Technology (Hydrotech) and Eng. Mohammad Nankali, for their collaboration in producing surfaces for this experiment.

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Authors and Affiliations

  1. School of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran

    H. Davar, N. M. Nouri & M. Navidbakhsh

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  1. H. Davar
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  2. N. M. Nouri
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  3. M. Navidbakhsh
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Correspondence to N. M. Nouri.

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Technical Editor: Monica Carvalho.

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Davar, H., Nouri, N.M. & Navidbakhsh, M. Enhancement of condensation heat transfer at aluminum surfaces via laser-induced surface roughening. J Braz. Soc. Mech. Sci. Eng. 43, 346 (2021). https://doi.org/10.1007/s40430-021-03047-9

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