ISSN Online: 2377-424X
International Heat Transfer Conference 5
TEMPERATURE DISTRIBUTIONS WITHIN ENCLOSED PLANE AIR CELLS ASSOCIATED WITH HEAT TRANSFER BY NATURAL CONVECTION
Résumé
The temperature fields associated with natural convection heat transfer within enclosed plane air cells with diabatic vertical walls have been studied using a Mach Zehnder interferometer. From the information thus obtained the heat transfer coefficients have been determined on the vertical walls. The average values have been correlated by a relationship of the form
Nu = Nu (Ra, A) where Nu is the Nusselt number
Ra is the Rayleigh number
and A is the cell aspect ratio (height/width).
A variety of cell sizes was used giving a range of Rayleigh number, 103 < Ra < 6.5 × 105 and a range of aspect ratio, 1.25 < A < 20. Within these ranges of the variable5Ra and A there were distinct regimes of characteristic temperature distribution. The findings regarding these regimes and the associated heat transfer coefficients will be discussed in detail.
Nu = Nu (Ra, A) where Nu is the Nusselt number
Ra is the Rayleigh number
and A is the cell aspect ratio (height/width).
A variety of cell sizes was used giving a range of Rayleigh number, 103 < Ra < 6.5 × 105 and a range of aspect ratio, 1.25 < A < 20. Within these ranges of the variable5Ra and A there were distinct regimes of characteristic temperature distribution. The findings regarding these regimes and the associated heat transfer coefficients will be discussed in detail.