Abstract
This numerical investigation aimed to analyze laminar natural convection inside a closed room containing two discrete heaters using Computational Fluid Dynamics (CFD). The Navier–Stokes equation was adopted to study the fluid flow inside the room. The fluid inside the room was standard air with the Prandtl number of 0.71. The top wall, bottom wall, and center portion of the right walls were considered adiabatic, while the left-side wall remains cold. Two discrete heaters were positioned near the top-and-bottom- side of the right wall, and the heater sizes were 20 and 30% of the room’s length. Rayleigh number (Ra) was considered within the laminar range that, they were varied from 103 to 106. Natural convection is induced between the walls due to the difference in temperature inside the room. The rate of heat transfer, velocity profile, streamlines, and isotherms were measured. The results show a strong influence of the heater’s size and the Rayleigh number on how the fluid in the room heated up. The heat transfer was influenced by conduction when Ra = 103. As the Ra increases, buoyancy force increases and shows the dominance of natural convection at Ra = 106. The findings suggest that by varying the heater size and the Rayleigh number, optimal thermal comfort can be achieved in the living place without going for any external mechanical forces. This understanding could help engineers prepare an energy-efficient structural design for buildings and provide excellent thermal comfort to the occupants.
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Abbreviations
- α :
-
Thermal diffusion of fluid
- β :
-
Thermal expansion coefficient
- γ :
-
Fluid kinematic viscosity
- μ :
-
Dynamic viscosity
- c p :
-
Specific heat
- k :
-
Thermal conductivity
- g :
-
Acceleration due to gravity
- u :
-
Dimensionless horizontal velocity
- v :
-
Dimensionless vertical velocity
- T :
-
Dimensionless temperature
- t :
-
Dimensionless time
- w :
-
Dimensionless vorticity
- Pr:
-
Prandtl number
- Ra:
-
Rayleigh number
- Nu:
-
Local Nusselt number
- \(\overline{{{\text{Nu}}}}\) :
-
Average of Local Nusselt number
- CFD:
-
Computation Fluid Dynamics
- FDM:
-
Finite Difference Method
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Jeseema Nisrin, J., Velkennedy, R., Kalidasan, K. (2022). Influence of Two Discrete Heaters on the Laminar Natural Convection Inside a Closed Room. In: Marano, G.C., Ray Chaudhuri, S., Unni Kartha, G., Kavitha, P.E., Prasad, R., Achison, R.J. (eds) Proceedings of SECON’21. SECON 2021. Lecture Notes in Civil Engineering, vol 171. Springer, Cham. https://doi.org/10.1007/978-3-030-80312-4_10
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DOI: https://doi.org/10.1007/978-3-030-80312-4_10
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