چكيده به لاتين
Today, the treatment of seawater and its conversion into drinking water is one of the basic and unavoidable issues in arid and low rainfall lands. From the past to the present, in different parts of the world, people have used various methods to prepare the fresh water they need, such as digging deep and semi-deep wells, storing rainwater, digging aqueducts, etc ; But at present, these methods can no longer meet the needs of all human beings due to the sharp drop in groundwater levels, population growth and global warming, followed by reduced rainfall In the distant past, around 400 BC, Aristotle introduced the distillation process as a way to desalinate water. In the following years, in the middle of the twentieth century, with the development of the process of sudden evaporation (flashing), a new period of water desalination was unveiled. These methods were based on a phenomenon called flashing, or the sudden evaporation of a fluid mass due to a sudden drop in pressure. With the passage of time and the increasing need of people for purified water, studies on this sudden process of phase change continued so that by recognizing it accurately, more water can be treated with less energy.
In this dissertation, we intend to study the geometric properties of the flash chamber and make changes in the geometry of the member that causes the flashing phenomenon, and to examine it numerically and experimentally, the best geometry that can be used for its purpose, which is the production of fresh water. More with less energy spent, found the receipt. At the end of this study, we will investigate the effect of factors such as flow, temperature and pressure of the fluid entering the flash chamber and the geometry of the flash chamber in the occurrence of flashing phenomenon. Finally, we will see that adding a barrier to the flash current will increase the measured steam rate at the output by up to 10 times, and also by adding a recirculation circuit in the water desalination system, the system performance will increase up to three times.
