Lecture 2.7: Advanced mixing problems Matthew Macauley Department - PowerPoint PPT Presentation

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Lecture 2.7: Advanced mixing problems Matthew Macauley Department of Mathematical Sciences Clemson University http://www.math.clemson.edu/~macaule/ Math 2080, Differential Equations M. Macauley (Clemson) Lecture 2.7: Advanced mixing problems

Lecture 2.7: Advanced mixing problems Matthew Macauley Department of Mathematical Sciences Clemson University http://www.math.clemson.edu/~macaule/ Math 2080, Differential Equations M. Macauley (Clemson) Lecture 2.7: Advanced mixing problems Math 2080, ODEs 1 / 6
Motivation Last time Suppose we have a tank of fresh water. Salt water flows IN at some (constant) rate. The water in the tank is fully mixed. Water drains OUT of the tank at the same rate. Question : What is the concentration of salt in the tank at time t ? This time What if. . . The incoming and outgoing rates are different? There are two tanks, and one drains into the other. M. Macauley (Clemson) Lecture 2.7: Advanced mixing problems Math 2080, ODEs 2 / 6
Rate in � = Rate out Example 2 Suppose we have a tank containing 150 gallons of fresh water. Salt water (concentration: 2 oz/gal) flows in at 3 gal/min. The water in the tank is fully mixed. Water drains from the tank at 1 gal/min. Question : What is the concentration of salt in the tank the moment it overflows? First step (always!) Let x ( t ) = # ounces of salt in the tank at time t . Then x ′ ( t ) = (rate in) − (rate out). M. Macauley (Clemson) Lecture 2.7: Advanced mixing problems Math 2080, ODEs 3 / 6
Example 2 (cont.) M. Macauley (Clemson) Lecture 2.7: Advanced mixing problems Math 2080, ODEs 4 / 6
Two tanks Example 3 Suppose we have two tanks, A and B. Tank A contains 100 gallons and 20 oz of salt. Tank B contains 200 gallons and 40 oz of salt. Fresh water enters tank A at 5 gal/min. Tank A drains into tank B at 5 gal/min. Tank B drains at 5 gal/min. Question : How much salt is there in each tank at time t ? M. Macauley (Clemson) Lecture 2.7: Advanced mixing problems Math 2080, ODEs 5 / 6
Example 3 (cont.) M. Macauley (Clemson) Lecture 2.7: Advanced mixing problems Math 2080, ODEs 6 / 6

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