الفهرس | Only 14 pages are availabe for public view |
Abstract Experiments have been performed to investigate the performance of the thermosyphon, (wickless heat pipe), by using a binary as a working fluid such as water-methanol or water-acetone. The effect of different parameters such as the binary mixture content, the inner heat-pipe diameter and the evaporator surface temperature have been studied. The experiments are carried for three different diameters ranging from 11 mm to 26 mm, binary mixture content ranging from 25% to 75% and the evaporator surface temperature up to 180°C. It was found from the present study that for both binary mixture content water-methanol and water-acetone with percentage 25% for both methanol and acetone, the range of the operating temperature were extended to be higher than using pure water as a working fluid, the critical flooding limits were extended to higher range and also it is observed that increased heat-transfer rates at lower ranges of operating temperature from 35°C to 60 ”C. It was also found that the heat transfer rate increases as the diameter of the thermosyphon heat pipe increases. According to the experimental results of the present work concerning the binary fluids as working fluids the major conclusions may be drawn, the ranges of the operating temperature and the critical flooding limit were extended to higher values than that thermosyphons using pure water, also the heat-transfer rates will increase in lower ranges of the operating temperatures |