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Experimental investigation of the Cu/R141b nanofluids on the evaporation/boiling heat transfer characteristics for surface with capillary micro-channels

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Abstract

An experimental study was conducted to investigate the heat transfer characteristic of a vertical copper plate with rectangular micro-channels. In this research, Cu/R141b nanofluids were used as the working fluid. Three different volume concentrations—0.001, 0.01, and 0.1 %—of Cu nanoparticles with an average diameter of 20 nm dispersed in R141b were prepared. Experiments were performed to measure thermal resistance of the microchannel surface under a steady operating pressure range of 0.86 × 105 Pa to 2 × 105 Pa. Thermal resistance weakened with addition of nanoparticles into the base fluid. The maximum reduction effect of the thermal resistance was 50 %, which corresponds to 0.01 % volume concentration of nanofluid at low operating pressure. The operating pressure significantly affects thermal performance of the microchannel surface. This paper also studied heat transfer characteristics for a Cu nanoparticle-coated surface with rectangular microchannels, which were produced by heating in different volume concentrations from 0.001 to 0.1 %. Nanoparticle layer on the micro-channel surface is responsible for enhanced heat transfer of nanofluids with 0.001 and 0.01 % volume concentrations.

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Abbreviations

q :

Heat flux (W m−2)

l :

Distance between two thermocouples (m)

R :

Thermal resistance (m2 K W−1)

T t :

Temperature of the copper plate with micro-channels (K)

T s :

Saturation temperature of the working fluid (K)

T 1, T 2, T 3, T 4 :

Temperature of the copper heater (K)

λ :

Thermal conductivity of the pure copper (W m−2 K−1)

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Authors and Affiliations

  1. The Department of Building Environment and Facility Engineering, The College of Architecture and Civil Engineering, Beijing University of Technology, Beijing, China

    Yanhua Diao, Yan Liu, Rui Wang, Yaohua Zhao & Lei Guo

Authors
  1. Yanhua Diao
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  2. Yan Liu
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  3. Rui Wang
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  4. Yaohua Zhao
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  5. Lei Guo
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Correspondence to Yanhua Diao.

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Diao, Y., Liu, Y., Wang, R. et al. Experimental investigation of the Cu/R141b nanofluids on the evaporation/boiling heat transfer characteristics for surface with capillary micro-channels. Heat Mass Transfer 50, 1261–1274 (2014). https://doi.org/10.1007/s00231-014-1325-1

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