In the Eulerian approach, the fluid is assumed to be a continuous medium, and elements inside the fluid should be considered for solving equations.
Two approaches can be used to solve fluid equations and investigate fluid behavior. So it is necessary to define the discrete phase. In the first simulation, the salt water is sprayed from the chamber’s top. Methodology: Humidification Dehumidification (HDH) The mesh of the second model is unstructured, and 553,086 cells are created. The number of production cells is equal to 206,928. The mesh of the first model is hybrid (a combination of structured and unstructured). Then the model meshed with ANSYS Meshing software. The geometry of the present project is modeled in three dimensions with Design Modeler software. The contact of hot steam with the spiral tube’s cold surface causes condensation and freshwater production.įor simplicity, the pipe modeling is omitted, and the pipe wall is defined with a thermal boundary condition of constant temperature (cooling temperature). Inside the chamber, spiral tubes are considered to carry the cooling water flow. The flow of moist air created from the previous step enters the chamber. The second simulation investigated dehumidification. The droplets in the membrane part of the chamber collide with the airflow and, after evaporation, produce humid air. At the same time, droplets of hot salt water are sprayed through several holes inside the chamber. The first simulation investigated humidification.ĭry air flows from the bottom of the chamber to the top. So, two simulations have been done for this problem. The mechanism of this system consists of two steps (humidification and dehumidification). It undergoes humidification or distillation of pure water from the steam. Now, the inside of the condenser shell is in contact with the cold feed water pipes (as mentioned before). This pure steam is reheated by a heater and enters the condenser. The resulting steam is pure, and its impurity settles in the evaporator. These droplets are mixed with the dry air out of the condenser and form wet steam or humidified air. This hot water enters the humidifier (evaporator), and the hot water is sprayed on the filter plates of the evaporator. Heat reception continues until the steam condenses, and as a result, the water inside the tube is heated. Then it takes the heat of the steam inside the shell. The cold water enters the spiral tubes inside the dehumidifier (condenser). One side of the system is the evaporator or humidifier, and the other is the condenser or dehumidifier. The mechanism of this method is based on humidification and dehumidification processes.
This CFD Project is about humidification dehumidification (HDH) system via ANSYS Fluent software. HDH system is a model of water desalination methods.
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