الفهرس 
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Abstract
In this work the characteristics of the inclined, closed
therrnosyphon tube was investigated.
A test rig was designed and constructed to achieve heat
transfer measurements from a closed tube filled with
Acetone as working fluid. The working fluid evaporated at
the lower end of the tube and condensated at the upper end.
The main parameters, namely, saturation pressure, heat
flux, inclination angle and fill ratio were investigated.
The experimental work was carried out at different
saturation pressures (1, 1.5 and 2 bar absolute) at different
seven heat fluxes (21404,17234,13659,10485,8356,6839
& 3615 W/m2). The results were obtained at different
inclination angles, these angles were (0, 15, 30, 45, 60 &75
degree) measured from the vertical axis and at a fill ratio of
0.25,0.5 and 0.75.
from detailed analysis of experimental results, it is
found that:
• Generally the heat transfer coefficient, (at both of the
evaporation and condensation sections), was affected by the
saturation pressure, heat flux, inclination angle and the fill
ratio.