Abstract
A two dimensional model of the transient natural convection in a cavity is studied numerically. The system is cooled isothermally from the right and heated from the left by three hot pieces. The temperature of hot pieces are heating with two types of excitations. In the first type, the temperature is varied sinusoidally in time while in the second, it varies with a pulsating manner. For each type of excitation, the effect of the amplitude of the excitating temperature(0 < a < 0.4) and its period (0.01 s< γ < 500 s) on heat transfer is studied. For the present study, the Rayleigh number is 106 and the working fluid is air(Pr = 0.70). The results obtained show that the transient heat transfer evacuated through the cold face of the enclosure is highly different from the steady case. In addition, it is demonstrated that the amplitude of the excitating temperature and its period have great effects on heat transfer.
| Original language | English |
|---|---|
| Pages (from-to) | 281-283 |
| Number of pages | 3 |
| Journal | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics |
| Volume | 25 |
| Issue number | 2 |
| State | Published - Mar 2004 |
Keywords
- Natural convection
- Numerical simulation
- Pulsating heating