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Experimental investigation of time and repeated cycles in nucleate pool boiling of alumina/water nanofluid on polished and machined surfaces

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Abstract

Pool boiling heat transfer of pure water and nanofluids on a copper block has been studied experimentally. Nanofluids with various concentrations of 0.0025, 0.005 and 0.01 vol.% are employed and two simple surfaces (polished and machined copper surface) are used as the heating surfaces. The results indicated that the critical heat flux (CHF) in boiling of fluids on the polished surface is ~7% higher than CHF on the machined surface. In the case of machined surface, the heat transfer coefficient (HTC) of 0.01 vol.% nanofluid is about 37% higher than HTC of base fluid, while in the polished surface the average HTC of 0.01% nanofluid is about 19% lower than HTC of the pure water. The results also showed that the boiling time and boiling cycles on the polished surface changes the heat transfer performance. By increasing the boiling time from 5 to 10 min, the roughness enhances about 150%, but by increasing the boiling time to 15 min, the roughness enhancement is only 8%.

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Abbreviations

A:

Boiling surface [m2]

Cp :

Special heat [J kg /K]

Csf :

Coefficient in Rosehnow equation

g:

Acceleration due to gravity [m/s2]

h:

Heat transfer coefficient [W /m2.K]

hfg :

Latent heat of vaporization [J /kg]

I:

Current [Amps]

k:

Thermal conductivity [W/m.K]

q”:

Heat flux [kW/m2]

Ra, Rp, Rq, and Rz :

Standardized roughness parameter [μm]

T:

Temperature [°C]

V:

Voltage [Volts]

Z(x):

Profile ordinates of roughness profile [μm]

Pr:

Prandtl number, C P μ/K

δ :

Distance of thermocouple from the boiling surface [m]

μ :

Dynamic viscosity [Pa.s]

ρ :

Density [kg/m3]

σ :

Surface tension coefficient [N/m]

sat:

Saturation

l:

Liquid

v:

Vapor

w:

Surface

m:

Measured

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Acknowledgments

The authors would like to express their appreciation to the Iranian Nanotechnology Initiative Council for providing financial support.

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Authors and Affiliations

  1. Department of Chemical Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran

    F. Rajabzadeh Dareh, M. Haghshenasfard & M. Nasr Esfahany

  2. Department of Material Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran

    H. Salimi Jazi

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  1. F. Rajabzadeh Dareh
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  2. M. Haghshenasfard
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Correspondence to M. Haghshenasfard.

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Rajabzadeh Dareh, F., Haghshenasfard, M., Nasr Esfahany, M. et al. Experimental investigation of time and repeated cycles in nucleate pool boiling of alumina/water nanofluid on polished and machined surfaces. Heat Mass Transfer 54, 1653–1668 (2018). https://doi.org/10.1007/s00231-017-2266-2

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  • DOI: https://doi.org/10.1007/s00231-017-2266-2

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