Abstract
This paper presents an experimental investigation on the pool boiling heat transfer of water containing Al2O3 and TiO2 nanoparticles at 0.01%, 0.05%, 0.1%, 0.5% and 1% mass fractions at ambient pressure. A horizontal flat polished stainless steel plate was chosen as the boiling surface. Significant improvements in the boiling heat transfer coefficient and critical heat flux were recorded up to 0.1%. However, a decrease in heat transfer performance was observed at other concentrations. The surface wettability of nanofluids was improved as the static contact angle on the boiling surface decreased with an increase in mass fraction. The roughness of the boiling surface decreased due to the development of a layer of nanoparticles on it. Al2O3–water nanofluids showed better boiling performance than TiO2–water nanofluids. Finally, the present experimental outcomes are further compared and elucidated with the published reports and developed theories. This may be effective for a better understanding of pool boiling phenomena in nanofluids.
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Abbreviations
- AFM:
-
Atomic force microscopy
- AC:
-
Alternating current
- BHTC:
-
Boiling heat transfer coefficient
- CHF:
-
Critical heat flux
- CNT:
-
Carbon nanotubes
- SDS:
-
Sodium dodecyl sulfate
- SEM:
-
Scanning electron microscopy
- SS:
-
Stainless steel
- A :
-
Area (m2)
- c :
-
Specific heat (J kg−1 K−1)
- C sf :
-
Experimental constant
- d :
-
Diameter (m)
- f b :
-
Bubble departure frequency (s−1)
- g :
-
Acceleration due to gravity (ms−2)
- h :
-
Heat transfer coefficient (W m−2 K−1)
- h fg :
-
Enthalpy of vaporization (J kg−1)
- I :
-
Electric current (A)
- m :
-
Mass (kg)
- n a :
-
Nucleation site density (site m−2)
- N c :
-
Number of microcavities per unit surface area
- P :
-
Parameter
- Pr:
-
Prandtl number
- R :
-
Dimension less roughness parameter
- R a :
-
Surface roughness (μm)
- q :
-
Heat flux (W m−2)
- T :
-
Temperature (°C)
- U :
-
Uncertainty
- V :
-
Voltage (V)
- X :
-
Independent variables
- ϕ :
-
Mass fraction (%)
- γ :
-
Surface force (N)
- λ :
-
Wettability parameter
- θ :
-
Contact angle (°)
- μ :
-
Viscosity (mPa s)
- ρ :
-
Density (kg m−3)
- δ :
-
Macrolayer thickness (m)
- σ :
-
Surface tension (Nm−1)
- AT:
-
Adhesion-tension
- b:
-
Bulk
- d:
-
Difference
- bf:
-
Basefluid
- f:
-
Fluid
- nf:
-
Nanofluid
- np:
-
Nanoparticles
- r:
-
Ratio
- sat:
-
Saturation
- w:
-
Wall
- n :
-
Experimental constant
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Acknowledgements
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). The authors are also thankful for Dr. Ashok Sahoo and Dr. Ramanuj Kumar of School of Mechanical Engineering, KIIT, for their valuable inputs in surface roughness measurement.
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Mukherjee, S., Mishra, P.C. & Chaudhuri, P. Pool boiling performance of aqueous Al2O3 and TiO2 nanofluids on a horizontally placed flat polished surface: an experimental investigation. J Therm Anal Calorim 146, 415–433 (2021). https://doi.org/10.1007/s10973-020-09995-z
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DOI: https://doi.org/10.1007/s10973-020-09995-z