Abstract
In this paper, heat transfer characteristics of nickel coating over aluminium and mild steel are examined using jet impingement cooling. A rectangular sheet of dimension 10 cm × 3.5 cm × 0.1 cm taken as the test piece is coated with 4 g nickel acetate tetrahydrate precursor in the chemical vapor deposition (CVD) process for 85 mins. Heat transfer characteristics are studied on three layers of nickel coating (no coating, first coating, and second coating) with an impinging air-jet velocity of 3.5 ms−1 and 6 ms−1. The effect of Reynolds number, the thickness of the coating, jet velocity, distance from the stagnation point, and nozzle diameter on the heat transfer coefficient are investigated. The results show an increase in convective heat transfer characteristics with the Reynolds number, the thickness of the coating, and the nozzle diameter and a substantial decrease with deviation from the stagnation point.
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Abbreviations
- DH :
-
Hydraulic diameter [m].
- v:
-
Velocity [ms−1].
- T:
-
Temperature [K].
- h:
-
Convective heat transfer coefficient [Wm−2 K−1].
- D:
-
Characteristic length of the body [m].
- k:
-
Thermal conductivity [Wm−1 K−1].
- Q:
-
Heat transfer rate [W].
- V:
-
Voltage [Volts].
- I:
-
Current [Ampere].
- Dp :
-
Particle size [nm].
- d:
-
Nozzle diameter [mm].
- x:
-
Distance from the point of impingement [cm].
- K:
-
Constant related to crystal shape.
- CVD:
-
Chemical vapor deposition
- Ni(hfa)2 :
-
Ni(hexafluoroacetylacetonate)2
- Ni(CO)4 :
-
Nickel Tetracarbonyl
- Ni[(acac)2en]:
-
Nickel bis(acetylacetone) ethylenediamine
- Cr(acac)3 :
-
Chromium (III) acetylacetonate
- XRD:
-
X-Ray diffraction
- Nu:
-
Nusselt number.
- Re:
-
Reynolds Number.
- μ:
-
Dynamic Viscosity [kgm−1 s−1].
- ρ:
-
Fluid density [kgm−3].
- λ:
-
Wavelength of x-ray [Å].
- β:
-
Half peak width of the diffraction peak [radians].
- θ:
-
Angle between diffracted wave and the lattice plane [degrees].
- a:
-
Air.
- w:
-
Wall.
- x:
-
Distance from the wall.
- l:
-
Local.
- s:
-
Stagnation.
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Bhasuru, V.K., Varshney, S., Agarwal, Y. et al. Heat transfer studies of surface synthesized by chemical vapor deposition. Heat Mass Transfer 56, 3229–3241 (2020). https://doi.org/10.1007/s00231-020-02931-9
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DOI: https://doi.org/10.1007/s00231-020-02931-9