Applied Mathematical Methods for Chemical Engineers, Second by Norman W. Loney

By Norman W. Loney

Concentrating on the appliance of arithmetic to chemical engineering, utilized Mathematical tools for Chemical Engineers, moment version addresses the setup and verification of mathematical versions utilizing experimental or different independently derived data.
An elevated and up to date model of its well-respected predecessor, this ebook makes use of labored examples to demonstrate a number of mathematical tools which are crucial in effectively fixing technique engineering difficulties. The booklet first presents an creation to differential equations which are universal to chemical engineering, through examples of first-order and linear second-order traditional differential equations (ODEs). Later chapters study Sturm–Liouville difficulties, Fourier sequence, integrals, linear partial differential equations (PDEs), and ordinary perturbation. the writer additionally makes a speciality of examples of PDE functions as they relate to a number of the conservation legislation practiced in chemical engineering. The publication concludes with discussions of dimensional research and the scaling of boundary price difficulties and provides chosen numerical equipment and to be had software program packages.

New to the second one Edition

· renowned techniques to version improvement: shell stability and conservation legislation balance

· One-dimensional rod version and a planar version of warmth conduction in a single direction

· structures of first-order ODEs

· Numerical approach to strains, utilizing MATLAB® and Mathematica the place appropriate

This important source offers a vital advent to mathematical tools for engineering and is helping in deciding upon an appropriate software program package deal for computer-based algebraic purposes.

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Example text

14 and expressing our findings as y ¼ w(x) and in this case, include the two integration constants as implied by the presence of the second derivative term. 14, we seek a function w(x) such that a times its second derivative added to b times its first derivative added to c times the function itself results in zero. Among all possible candidate functions, the function w(x) ¼ erx, where r is a constant, turns out to be the best candidate. 16 is called the characteristic or auxiliary equation and the resulting roots r1 and r2 are called the characteristic roots or the eigenvalues.

2 can be rewritten as d2 y dy (3:6) þ p(x) þ q(x)y ¼ g(x), dx2 dx following division by P(x). Similar to first-order equations, the issue of existence and uniqueness of a solution to second order equations must be dealt with. Below is a theorem [1,4] that addresses the existence and uniqueness of solutions of second-order differential equations. 6, y00 þ p(x)y0 þ q(x)y ¼ g(x) on the entire interval a < x < b and the given initial conditions, y(x0 ) ¼ y0 , y0 (x0 ) ¼ y00 at a particular point x0 in the interval.

If the discriminant b2 À 4ac ¼ 0, then r1 and r2 are identical and there only results one solution, namely eÀ(b/2a)x, that is y1 ¼ eÀ(b=2a)x (3:20) In order to find y2, consider the following procedure. Let y ¼ y(x)eÀ(b=2a)x (3:21) then b y(x)eÀ(b=2a)x 2a ! 2006 2:08pm Applied Mathematical Methods for Chemical Engineers If the discriminant b2 – 4ac < 0 then r1 and r2 are complex numbers. Furthermore, since a, b, and c are real, then r1 and r2 will be a conjugate pair. That is pffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi b i b2 À 4ac r1 ¼ À þ ¼ l þ im 2a 2a pffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi b i b2 À 4ac ¼ l À im r2 ¼ À À 2a 2a (3:30) (3:31) where the real numbers l and m are introduced for convenience.

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