چكيده به لاتين
In the past decade, special attention has been paid to ultrasound waves in various industries.
One of the applications of these waves, which has recently been noticed by researchers, is the
behavior of these waves in the fluid environment. On the other hand, it is one of the most
widely used fluids in the water industry. All these factors work hand in hand to make
understanding the behavior of ultrasound waves in the water environment one of the most
important issues of the day. Therefore, in the present project, the behavior of ultrasonic waves
in the phase change process of water has been investigated. First, the general behavior of
ultrasound waves in fluid and then concepts such as acoustic cavitation are explained. Also,
the applications of ultrasonic waves in liquids and past studies in this field are examined. The
main goal of this project is to investigate the effects of ultrasound waves in the phase change
process of water from liquid to vapor. In the first step, a system is designed to determine the
effective parameters of the test, i.e. temperature, fluid pressure, water height above the wave
generator module, and output steam flow rate. The mentioned system has two main parts,
evaporator and condenser, and the piezoelectric transducer, which is responsible for generating
waves, is placed at the bottom of the evaporator tank. The whole set is connected to a vacuum
pump so that the pressure inside the system can be adjusted in different values. The testing
process has two parts. First, the water in the evaporator tank is placed at different temperatures,
and the steam produced from the heat flux applied to the evaporator tank goes to the condenser
section, and its volume is measured through a graduated cylinder located in the end section of
the condenser. As a result, the amount of steam produced in the evaporator section is obtained
at different temperatures and pressures. In the second part of the test, the same process is carried
out with the presence of ultrasound waves. Of course, in this section, in addition to the
temperature, the height of the water around the piezo transducer is also changed so that the
effects of the height are also investigated. As mentioned, the temperature and water height
above the piezoelectric module are two parameters that determine the effect of the module on
the steam production process. If the temperature of the water inside the evaporator, which is
affected by the ultrasonic waves, increases, the produced steam flow will also increase.
Regarding the height, it was also observed that with the increase in height, the effect of
ultrasonic waves decreases and at a height of 4 centimeters, the waves have the greatest impact
on the process of steam production.
