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Developing system model of liquid flow

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Two different cylindrical tanks interconnected by a pipe with a valve.

A mathematical model of the process is required to determine the change in height of the fluid in the 2nd tank when the valve is opened. A system time constant is also required. Attached is an example of Mass Balance for one tank.

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Solution Summary

Analysis of the flow of liquid through a connected double tank system and derivation of system model to predict height of liquid in second tank at any time and the time constant of the system

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Transfer Function Analysis and Models

Please see the attached file for the fully formatted problems.

Two identical stirred tanks with a recycle stream are connected as shown in the diagram below:

V1 CAo,Fo


The system has a single feed, two tanks, and a single product. All levels are constant.

Derive the transfer function relating changes in the effluent concentration (Cao) to changes in feed concentration (Cai) and recycle flow rate (Fr).

Assume that the tanks are well mixed, the density is constant, and transportation delays due to pipes are negligible.


Consider the storage tank shown below:

F2 F3=2m3min-1


The level (h) is to be controlled by manipulating the outlet flow rate (F2). The load (disturbance) is the inlet flow rate (F1).

a) Develop the open loop transfer functions Gp(s) and Gd(s) relating the liquid level to the manipulated and disturbance flows respectively. State the time constants and process gains.
b) Draw a block diagram of the system with controller.

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