Abstract
Jet impingement is an active method for the heat transfer enhancement and is in practice in a big way in industries where focussed heating or cooling has to be achieved. In the present experimental work, the parameters like Reynolds number and the non-dimensionalized jet to plate spacing (H/D) have been varied to study the variation in the radial distribution of Nusselt number over the Aluminum flat plate. The air jet diameter of 15 mm is used for the analysis. Reynolds number ranging 4000 to 10,000 and H/D is 2 and 4. The experimental results show close agreements with that of the obtained from the numerical results which are calculated using a commercial CFD code ANSYS FLUENT. After through model testing SST k–ω turbulence model is employed to arrive at the results and conclusion. It is concluded that increasing Reynolds number and decreasing the H/D increases the Nusselt number.
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Abbreviations
- D :
-
Jet Diameter (m)
- H :
-
Distance between jet exit and target plate (m)
- Nu:
-
Nusselt Number
- Re:
-
Reynolds Number
- \( V_{o} \) :
-
Mean velocity at the jet inlet (m/s)
- \( u_{i} \) :
-
Fluctuating velocity vector
- \( V \) :
-
Voltage (volts, V)
- \( I \) :
-
Current (ampere, A)
- \( A_{\text{plate}} \) :
-
Area of target plate (m2)
- \( L_{\text{c}} \) :
-
Characteristic length (m)
- \( q_{\text{conv}} \) :
-
Convection heat transfer (W/m2)
- h:
-
Heat transfer coefficient (W/K m2)
- \( P_{\text{k}} \) :
-
Production of turbulent kinetic energy (J)
- P :
-
Pressure (Pa)
- \( k \) :
-
Turbulent kinetic energy (m2/s2)
- T:
-
Static temperature (K)
- T ′ :
-
Fluctuating temperature (K)
- U :
-
Mean velocity (m/s)
- Pr:
-
Prandtl number
- \( \mu \) :
-
Viscosity (kg/m s)
- \( \mu_{\text{t}} \) :
-
Turbulent eddy viscosity (kg/m s)
- \( \mu_{\text{e}} \) :
-
Eddy viscosity (kg/m s)
- \( \rho \) :
-
Fluid density (kg/m3)
- \( \omega \) :
-
Specific dissipation rate (s−1)
- \( \updelta_{\text{ij}} \) :
-
Kronecker delta
- \( i,j \) :
-
Index of coordinate direction
- \( a \) :
-
Atmospheric condition
- \( p \) :
-
Target plate
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Baghel, Y.K., Patel, V.K. (2020). Experimental and Computational Analysis of Heat Transfer by a Turbulent Air Jet Impingement on a Flat Surface. In: Biswal, B., Sarkar, B., Mahanta, P. (eds) Advances in Mechanical Engineering. Lecture Notes in Mechanical Engineering. Springer, Singapore. https://doi.org/10.1007/978-981-15-0124-1_10
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