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Convective Flow Boiling Heat Transfer Enhancement with Aqueous Al2O3 and TiO2 Nanofluids: Experimental Investigation

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Abstract

The convective flow boiling characteristics of aqueous Al2O3 and TiO2 nanofluids are presented in this paper. Stable suspensions of aqueous Al2O3 and TiO2 nanofluids at two different concentrations of 0.01 and 0.1 wt% were prepared and allowed to flow through a horizontal annulus under varying heat flux from 26,140.132 to 53,573.503 W⋅m−2 and varying flow rates from 3 to 6 L⋅min−1. Parametric effects of nanoparticle concentration, heat flux, and flow rate on the heat transfer coefficient (HTC) were studied. Variation in pressure drop and pumping power at studied concentration and flow rates was estimated. In addition to that, bubble growth and nucleation site were analyzed using flow visualization technique. Enhancement in the HTC was obtained with increasing concentration and flow rate. A maximum of 2.4 times enhancement in HTC relative to water was observed. Bubble growth and nucleation site density increased with increasing heat flux and nanofluid concentration. Pressure drop and pumping power increased with nanoparticle addition and even at such a low-flow condition. Highest pressure drop of 33.33 % was registered with nanofluids at 0.1 wt%. The change in heating surface roughness due to particle deposition affects heat transfer performance. Finally, figure of merit showed that nanofluids are better alternatives to their basefluids for superior heat transfer.

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Abbreviations

A:

Absorbance (a.u)

D:

Diameter (m)

I:

Current (A)

L:

Length (m)

h:

Heat transfer coefficient (W m−2⋅K−1)

q’:

Heat flux (W⋅m−2)

T:

Temperature (°C)

P:

Pressure (kPa)

U:

Uncertainty in measurement

Φ:

Wt concentration (%)

ω:

Weight (g)

Δ:

Difference or error

π:

Constant

bf:

Basefluid

nf:

Nanofluid

np:

Nanoparticles

in:

Inlet

out:

Outlet

s:

Surface

r:

Ratio

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Acknowledgments

The authors cordially acknowledge the financial support provided by the Board of Research in Nuclear Sciences (BRNS), Department of Atomic Energy, Govt. of India (Sanction no: 39/14/04/2017-BRNS/34301).

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Authors and Affiliations

  1. Thermal Research Laboratory (TRL), School of Mechanical Engineering, Kalinga Institute of Industrial Technology (Deemed to be University), Campus-8, Patia, Bhubaneswar, Odisha, 751024, India

    Sayantan Mukherjee, Smita Rani Panda & Purna Chandra Mishra

  2. Institute for Plasma Research (IPR), Bhat, Gandhinagar, Gujarat, 382428, India

    Paritosh Chaudhuri

  3. Homi Bhabha National Institute, Anushaktinagar, Mumbai, 400094, India

    Paritosh Chaudhuri

Authors
  1. Sayantan Mukherjee
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  2. Smita Rani Panda
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  3. Purna Chandra Mishra
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  4. Paritosh Chaudhuri
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Correspondence to Purna Chandra Mishra.

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Mukherjee, S., Panda, S.R., Mishra, P.C. et al. Convective Flow Boiling Heat Transfer Enhancement with Aqueous Al2O3 and TiO2 Nanofluids: Experimental Investigation. Int J Thermophys 42, 88 (2021). https://doi.org/10.1007/s10765-021-02850-9

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  • DOI: https://doi.org/10.1007/s10765-021-02850-9

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