الفهرس 
IntroductionOnly 14 pages are availabe for public view
 |  | from | 109 |  |  |
| | | from | 109 | | |
Abstract
In the present study, the rotating heat pipe performance is investigated experimentally. The thesis aims to study the effect of working fluid charge ratio, rotating speed, and inclination angle on theperformance of heat pipe. To perform this task a test rig had been built with facilities to measure input power cooling water flow rate and rotating speed. Also electric circuit is used to control the speed of rotation of rotating motor. The tested heat pipe has a inner diameter 2.54 cm. Evaporator section length is 11 cm, adiabatic section length is 26cm and condenser section is 11cm. Testswere done at working fluid charge ratio of 5%, 10%, 15%, 20%, and 30% of the total interior volume of pipe. The different input power levels are 50W, 100W, 200W, and 300W. Finally the pipe was tested at inclination angle 5o with horizontal level at charge ratio 30% for different input power levels.The results show that the best charge ratio is 5% at different levels of input power. The more the input power the more overall heat transfer coefficient. Also as the rotation speed increases the heat transfer coefficient increases. Also the inclination of the heat pipe enhances the performance of heat pipe at low level of input power 50W, 100 W. At high input power 200W, 300 Watt the inclination has a bad effect.Also a study to evaluate the validity of experimental results withSong et al experimental work and models of Song et al , and model of Li et al is presented. The results show that the present experimental data have the same trend at charge ration 5% with experimental results of song et al, but with small differences in values. These differences in results may be due to the difference in pipe configuration. Consequently song model et al have the same conclusion. Also the experimental data have the same trend of Li et al at low charge ratio. But at high charge ratio there area big differences.