The membrane leaf (consisting of filtration channel i.e. a feed flow channel and a permeate flow channel) is divided in m = 5 and n = 5 segments (oriented in orthogonal directions), each of distance Δx and Δy respectively to form a grid, as shown in Figure 1.The dimensions of the finite element i.e. Δx and Δy are obtained as:
Δx =L/m (1)
Δy =W/n (2)
where L = length of the membrane leaf (along the spiral wound module) [m; L]; W = width of membrane leaf (orthogonal longitudinal axis of spiral wound module) [m; L].The input parameters to model Qf0, Pf0 and Cf0, are the operating parameters for the element of the grid as shown in fig below
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