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### HW11_Sol

Course: CE 311, Fall 2008
School: University of Texas
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Word Count: 271

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311K CE - McKinney HW-13 Numerical Integration 1. Integrate the following function (a) analytically (b) Trapezoid Rule using n = 4, and (c) Simpson's Rule using n = 4. Compute the percent error for both numerical integrations using the analytical value as the true value. (a) analytically Using n = 4 (b) Trapezoid Rule b a f (x)dx (3 0) /4 [0+2(3.36 + 30.13 + 202.29) + 1210.29] = 630.8784 2 error = 25.04% (c)...

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311K CE - McKinney HW-13 Numerical Integration 1. Integrate the following function (a) analytically (b) Trapezoid Rule using n = 4, and (c) Simpson's Rule using n = 4. Compute the percent error for both numerical integrations using the analytical value as the true value. (a) analytically Using n = 4 (b) Trapezoid Rule b a f (x)dx (3 0) /4 [0+2(3.36 + 30.13 + 202.29) + 1210.29] = 630.8784 2 error = 25.04% (c) Simpson's Rule. b a f (x)dx (3 0) /4 [0+4(3.36 + 202.29) + 2(30.13) + 1210.29] = 523.5356 3 error = 3.77% 2. Integration provides a means to compute how much mass enters or leaves a reactor over a specified time period, as in where and are the initial and final times. This formula makes intuitive sense if you recall the analogy between integration and summation. Thus the integral represents the summation of the product of flow times concentration to give the total mass entering or leaving from to . If the flow rate is constant, Q can be moved outside the integral. outflow The chemical concentration from a completely mixed reactor is measures as: t, min c, mg/m3 0 10 5 20 10 30 15 40 20 60 30 80 40 70 50 50 60 60 For an outflow of Q = 10 m3/min, use Simpson's 1/3 rule to estimate the mass of chemical that exits the reactor from t = 0 to 60 min. Solve the integral using Simpson's rule for the mass entering the reactor. 3. Integrate the function tabulated in the following table using the Trapezoid Rule. x 1.6 1.8 2.0 2.2 2.4 2.6 f(x) 4.953 6.050 7.389 9.025 11.023 13.464 x 2.8 3.0 3.2 3.4 3.6 3.8 f(x) 16.445 20 .086 24.533 29.964 36.598 44.701 , find the true value If the values in the table are from the exponential function of the integral and compute the percent error in your integration. b a f(x)dx x ( f 0+2 f1+2 f 2 + 2 3.8 1.6 + 2 f n-2 + 2 f n-1 + f n ) = n 1 x ( f 0+2 f i + f n ) 2 i=1 f(x)dx 0.2 (4.953+2 * 349.154 + 44.701) = 39.88 2 3.8 x 1.6 e dx = ex 3.8 =e e = 44.701 4.953 = 39.748 Error 1.6 3.8 1.6
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