uetian98

lol ... C1 is constant ... Inlet concentration of Oxygen is constant where as outlet concentration of Oxygen varies with Nitrogen bubling rate, water flowrate, agitation speed etc. sorry

Thanks Atheist / Klynos... Let me paste the equations here. V(dC0/dt) = FW (C1-C0) – NAV Here only V & C0 are the only constant - V.....................Volume of tank C0.....................Outlet conc. of Oxygen in Water C1.....................Inlet conc. of Oxygen in Water FW.....................Volumetric Flow rate of Water NA.....................Mass Transfer rate (NA = KLA(C0-C*) KL.....................Liquid Film Mass Transfer Coefficient A.....................Surface Area of Bubbles / Unit Volume C*.....................Equilibrium Conc. of Oxygen in Water Actually I am working on a pilot scale rig. This pilot rig consists of a water filled glass walled Jar with an impeller (vertically mounted) in there. Water enters the Jar near the bottom and leaves (overflows) from a point near the top. Nitrogen is bubbled via a sparger sitting on the botom of the jar to disturbed the already dissolved oxygen (resulting in desorbing the Oxygen out of water body). We have analysers installed that measure the oxygen contents in the water body I have the equation as above. now considering all the parameters like Water flowrate, extra extra.... I need a dynamic model taking care of all the changes and disturbances. Where to start form

What I require here is a set of procedure / steps to have it solve

Klaynos, thanks for you much considerate reply. Let me state my problem once again. I will generate linear / nonlinear dynamic model of that system them will simulate them into MATLAB. I dont need a readymade solution. thanks. ANY one who can guide:-( ?

Hi All, I am given a task to generate a linear as well as a nonlinear dynamic model of a process. All that I am given is a differential equation. Now Situation is that, I dont know the procedure and/or steps to generate thus models. Can anyone help me please ? Thanks