The temperature distribution u(x, t) in a bar 1 m long, insulated along its length, is given by the heat equation, Ju J²u Əx² Ət (0 < x < 1, t > 0), where x measures distance along the bar, t is time, and u is temperature measured in °C. Initially the bar has the temperature distribution (0 < x < 1). The end of the bar at x = 0 is kept in contact with a block of ice at 0° C, while the other end at x = 1 is insulated. u(x, 0) = cos² (577) 2 sin ( 5πx 2 (a) Write down the boundary conditions for the temperature distribution that model the situation described above. 5πα 2 (b) Use trigonometric identities to show that the initial condition can be expressed as u(x, 0) = P sin + Q sin (² and find the real numbers P and Q. (c) Consider the eigenvalue problem 15πα X"(x) + XX(x) = 0,_X(0) = X′(1) = 0. Find the eigenvalues and eigenfunctions. You may assume that all eigenvalues are positive. (d) Use the method of separation of variables to find an expression for the temperature distribution in the bar for t > 0.
The temperature distribution u(x, t) in a bar 1 m long, insulated along its length, is given by the heat equation, Ju J²u Əx² Ət (0 < x < 1, t > 0), where x measures distance along the bar, t is time, and u is temperature measured in °C. Initially the bar has the temperature distribution (0 < x < 1). The end of the bar at x = 0 is kept in contact with a block of ice at 0° C, while the other end at x = 1 is insulated. u(x, 0) = cos² (577) 2 sin ( 5πx 2 (a) Write down the boundary conditions for the temperature distribution that model the situation described above. 5πα 2 (b) Use trigonometric identities to show that the initial condition can be expressed as u(x, 0) = P sin + Q sin (² and find the real numbers P and Q. (c) Consider the eigenvalue problem 15πα X"(x) + XX(x) = 0,_X(0) = X′(1) = 0. Find the eigenvalues and eigenfunctions. You may assume that all eigenvalues are positive. (d) Use the method of separation of variables to find an expression for the temperature distribution in the bar for t > 0.
Advanced Engineering Mathematics
10th Edition
ISBN:9780470458365
Author:Erwin Kreyszig
Publisher:Erwin Kreyszig
Chapter2: Second-order Linear Odes
Section: Chapter Questions
Problem 1RQ
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