الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
The purpose of this study is to investigate of a two phase closed thermosyphon.A special machining technique has been developed in the production of thermosyphon. Experiments are performed to investigate the effect of heat load, filling ratio and working fluid type (volume of the working fluid to the evaporator volume) and the inclination angle on thermosyphon performance. The thermosyphon is made of a smooth copper tube with an inside diameter of 25mm, thickness of 2mm and total length of 1500 mm that consists of three sections: adiabatic section, evaporator, and condenser. The evaporator and condenser length is 600 mm and the adiabatic length is 300 mm.with R 407c as the working fluid. Perspex glass tube (water jacket) surrounds the condenser section where the cooling water is flowing through the annular passage.The main heater of the evaporator section is made of a nickel-chrome strip.The inclination angle in this study is varied from0 to 90 . The experimental test rig consists of a copper / R407c thermosyphon, a heater for evaporator section equipped with a digital clamp-meter to measure electrical power, a direct jacket calorimeter for heat removal (condenser), temperature measurement equipment, and some other auxiliary equipment.III The experiments show the effect of varying the heat flux, inclination angle and the filling ratio on the characteristics performance of thermosyphon. The selected heat flux varied from 1155 to 2853 W/m2 and the selected filling ratios are 35, 50, 60 and 80 %. The thermosyphon inclination angle is changed from 0 to 90 at all filling ratios and heat fluxes. The experimental results prove that the inclination angle had an important effect on the thermal performance of the thermosyphon. The maximum heat transfer occurred at vertical inclination angle (= 90 ), and decreased as decreasing the inclination angle. The maximum performance of the thermosyphon value exists at a filling ratio of 50 % and inclination angle (= 90 ).