
Perform the first computation in Sec. 28.1, but for the casewhere

To calculate: The solution for c if thedifferential equation for mass balance of single reactor is
Answer to Problem 1P
Solution:
The solution for c by the Heun method where
Heun withoutiteration | |
t | c |
0 | 10 |
10 | 25 |
20 | 34.375 |
30 | 40.23438 |
40 | 43.89648 |
50 | 46.1853 |
The solution for c by fourth-order RK method where
4th order RK | |
t | c |
0 | 10 |
10 | 25.72917 |
20 | 35.27317 |
30 | 41.06419 |
40 | 44.57801 |
50 | 46.71009 |
Explanation of Solution
Given Information:
The differential equation for mass balance of single reactor is,
The values,
The analytical equation for mass balance of single reactor is,
Formula used:
The iteration formula for Heun’s method is,
The fourth-order RK method for
Where,
Calculation:
Consider the analytical equation for mass balance of single reactor is,
Substitute the values
Now, use VB code to determine c at different value of t using Heun’s method and RK4 method as below,
The following output gets displayed in the excel after the execution of the above code:
To draw the graph, use excel as below,
Step 1: Select cells from B5 to B10 and C5 to C10, then go to Insert tab and select the Line option from Charts subgroup.
Step 2: Select cells from B17 to B22 and C17 to C22, then go to Insert tab and select the Line option from Charts subgroup
Step 3: Merge the graphs.
The graph obtained is,
Hence, both the method gives the same results.
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Chapter 28 Solutions
Numerical Methods for Engineers
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