Abstract:
Experimental investigation of natural convection heat transfer from. a -heated cylinder at
different pressure and inclinations to ambient air and argon was carried out. The test cylinder
was maintained at a constant temperature of 91S c. The measurements covered the fluid
pressure ranging from 5 to 1700 mm of Hg absolute. The inclinations of the axis of the
cylinder with vertical were 0', 30', 45', 60' and 90'. The range of Rayleigh number covered
was 103~aL$1.5X1 07
The investigations show that heat transfer coefficient vary logarithmically with pressure. The
plots of Nusselt number a+winst pressure and against Rayleigh number are both linear on a
log-log plot.
From the experimental results, correlations are developed in terms of Nusselt number,
Rayleigh number, and inclination of the cylinder. The reliability of these correlations are all
,
within :tl 0% of the experimental data.
