چكيده به لاتين
In recent years, the use of a spiral wound reverse osmosis for desalination salty water has been widely used. The important thing in these systems is the operation to reduce energy consumption and increase the amount of fresh water produced. The spacer in the feed channel of the spiral wound reverse osmosis causes the separation of the membrane plates. These filaments increase the pressure drop in the channel and, in contrast, improve the process of mass transfer in the channel. In the present study, using a simulation of computational fluid dynamics in a prototype, we first studied the properties of hydrodynamics and mass transfer in a feeding spacer-filled channels. Then, according to the results of the independent variables, three input parameters were selected and a design space was created using them. In the design space created by the simulation of computational fluid dynamics and the response surface methodology, the results of the output parameters are obtained. Input parameters include the average inlet velocity, attack angle and angle between filaments (mesh angle), and the output parameters including the pressure drop in the channel, water flux of the membrane wall, and the Spacer configuration efficiency. From the design of experiments and the Latin Hypercube Sampling (LHS) design, the kriging model for the response surface methodology and the genetic algorithm were used to find the optimal points. The sensitivity analysis of the input parameters on the SCE (the most effective output parameter) indicates that the average inlet velocity and the attack angle are the most and the least influential parameters respectively.Optimization results in combination mode, when the pressure drop is the minimum value and the water flux and the phrase "Effectiveness of the separators configuration", have an attack angle of 74.98 degrees, a mesh angle of 85.95 degrees, and an average inlet velocity of 0.0428 meters Per second. Due to the change in the velocity along the membrane, which consists of several elements, the maximum utilization of RO modules can be achieved by changing the geometric structure of the spacers in each step.
