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Experimental investigation into effects of ultrasonic vibration on pool boiling heat transfer performance of horizontal low-finned U-tube in TiO2/R141b nanofluid

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Abstract

An experimental investigation was performed into the pool boiling heat transfer performance of a low-finned U-tube immersed in TiO2/R141b nanofluid with four different nanoparticle loadings (0, 0.0001, 0.001, and 0.01 vol%). The energy-dispersive X-ray spectrometry results revealed that some of the TiO2 nanoparticles adhered to the heated surface during boiling, and therefore increased the thermal resistance. The heat transfer performance of the nanofluids with particle loadings of 0.0001, 0.001 and 0.01 vol% was thus found to be reduced by around 10, 20 and 50 %, respectively, compared to that of pure R141b refrigerant. Accordingly, an ultrasonic vibration crusher was used to inhibit the formation of the TiO2 nano-sorption layer on the U-tube surface. The ultrasonic vibration suppressed the deposition of TiO2 nanoparticles and improved the heat transfer performance of the nanofluids as a result. Of the four working fluids, the nanofluid with a particle loading of 0.0001 vol% yielded the optimal heat transfer performance (i.e., a heat transfer coefficient around 30 % higher than that of pure R141b refrigerant.)

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Abbreviations

A c :

Cross-sectional area of U-tube

C p :

Specific heat at constant pressure

d :

Diameter

h :

Heat transfer coefficient

k :

Thermal conductivity

LMTD :

Log mean temperature difference

M :

Molecular weight

\(\dot{m}\) :

Mass flow rate

Nu :

Nusselt number

P :

Pressure

Pr :

Prandtl number

q″:

Wall heat flux

Re :

Reynolds number

R p :

Surface roughness

T :

Temperature

T sat :

Saturation temperature

T w :

Wall temperature

U :

Overall heat transfer coefficient of U-tube

V :

Velocity of hot water within U-tube

vol%:

Particle volume fraction

W :

Mass

μ :

Liquid viscosity

ρ :

Density

U :

U-tube

o:

Shell side

i :

Tube side

sat :

Saturation property

in :

Inlet of U-tube

out :

Outlet of U-tube

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Acknowledgments

This study was supported by the National Science Council of Taiwan under Grant Nos. NSC98-2221-E-218-044 and NSC99-2221-E-218-013.

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Authors and Affiliations

  1. Department of Mechanical and Energy Engineering, National Chiayi University, No. 300, Syuefu Rd., Chiayi City, 600, Taiwan

    Tong-Bou Chang & Zi-Long Wang

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  1. Tong-Bou Chang
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  2. Zi-Long Wang
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Correspondence to Tong-Bou Chang.

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Chang, TB., Wang, ZL. Experimental investigation into effects of ultrasonic vibration on pool boiling heat transfer performance of horizontal low-finned U-tube in TiO2/R141b nanofluid. Heat Mass Transfer 52, 2381–2390 (2016). https://doi.org/10.1007/s00231-015-1746-5

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  • DOI: https://doi.org/10.1007/s00231-015-1746-5

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