Abstract
In this study, the experimental investigation of pool boiling heat transfer performance, stability, and compatibility in a hydrothermal environment of annealed micro/nanostructure-coated surfaces was performed at atmospheric conditions. Multi-functionalized surfaces are fabricated by employing physical vapour deposition technique without and with heat treatment @ 500 ℃ for 24 h in an inert atmosphere. The micro/nanostructured surfaces were characterized by MCA, SEM, and TEM. The results ascertain the lowering of about 1/2 of the wall superheat and 3/4 surge in heat transfer coefficient for annealed titanium oxide modified surface underperforming the plain surface. The recorded improvement is the conducive of promoted hydrophilicity, ladened small artificial cavity, and spike in surface roughness on the modified surface. The performance, stability, and compatibility of modified micro/nanostructure surfaces were inspected and affirmed that after three brief trial experiments the heat transfer coefficient invariably remained unimpeded with changes in heat flux.
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Abbreviations
- q :
-
Heating rate (W)
- Q :
-
Heat flux (W/M2)
- h :
-
Heat transfer coefficient (W/m2k)
- k :
-
Thermal conductivity of metal (W/m.k)
- V :
-
Voltage (V)
- I :
-
Current (A)
- D :
-
Diameter (m)
- ∆T:
-
Wall superheat (\(^\circ\) k)
- \(T_{s}\) :
-
Surface temperature (\(^\circ\) k)
- \(T_{l}\) :
-
Saturated temperature of liquid (\(^\circ\) k)
- A :
-
Area of cross section (m2)
- \(U_{h}\) :
-
Uncertainty of heat transfer coefficient
- \(U_{q}\) :
-
Uncertainty of heat flux
- \(U_{A}\) :
-
Uncertainty of area
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Acknowledgements
This work was supported by the Faculty Research Grant-2019, National Institute of Technology Calicut. The authors thank NIT Agartala, SAIF (IITB), and SAIF (IITP) for characterization of heating surfaces.
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Das, S., Johnsan, R. (2021). Performance of Pool Boiling Heat Transfer on Annealed Nanofilm Surfaces. In: Prabu, T., Viswanathan, P., Agrawal, A., Banerjee, J. (eds) Fluid Mechanics and Fluid Power. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-16-0698-4_18
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DOI: https://doi.org/10.1007/978-981-16-0698-4_18
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