Heat conduction in one dimension
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Heat conduction in one dimension 3 Heat conduction in one dimension Consider a metal rod which for practical reasons we...
Problem 3 Using Fourier series expansion, solve the heat conduction equation in one dimension a?т ат ax2 де with the Dirichlet boundary conditions: T T, if x 0, and T temperature distribution is given by: T(x, 0) -f(x) T, if x L. The initial 0 = *First find the steady state temperature distribution under the given boundary conditions. The steady form solution has the form (x)-C+C2x *Then write for the full solution T(x,t)=To(x)+u(x,t) with u(x,t) obeying the boundary contions U(0,t)...
Consider a 2 m long metal rod. The temperature u(z,t) at a point along the rod at any time t is found by solving the heat equation k where k is the material property. The left end of the rod ( 0) is maintained at 20°C and the right end is suddenly dipped into snow (0°C). The initial temperature distribution in the rod is given by u(x,0)- (i) Use the substitution u(z,t) ta,t)+20-10z to reduce the above problem to a...
Question 7 When the conduction electrons in a metal are treated as an ideal gas of fermions, the mean number of electrons occupying a state with energy e is given by I+ (-2) (3)u (a) Define the Fermi energy [ marks] (b) Sketch n as a function of e for an electron gas: (i) at T 0 K, and to the Fermi temperature (ii) at a temperature above 0 K, but small compared Label and briefly justify each sketch [5...
Problem 1 (15 pts) Consider heat conduction on a slender homogeneous metal wire with constant crosssection as shown in Fig.1. L- 10cm Conductivity k = 100 w/m°C. Q(x)= 100.000W/㎡. At x = 0, q = 250 W/ m2. TL = 25 oC. Governing equation: _kdTeQ (0%L) Boundary condition: dT -k Figure 1 Heat conduction on a 1-D metal wire. a. Solve for T (x) with two linear elements (X1 = 0, x2-4cm, and X3 = 10cm) ; b. Compare with...
Cooling fins are used to increase the area available for heat transfer between metal walls and poorly conducting fluids such as gases. A rectangular fin is shown in the following figure. To design a cooling fin and calculate the fin efficiency one must first calculate the temperature profile in the fin. If L>>B, no heat is lost from the end or from the edges, and the heat flux at the surface is given by: in which the convective heat transfer...
3. 3 points A metal rod has a length of 10cm, and has its left end at zn0 and right end at z = 5. The temperature T(z,1) of the rod satisfies the heat equation T,r(z,t)-m(r,t), its ends are kept at 0 for all t, and its temperature distribution at time t0 is given by T(a,0)a. Find the temperature function T(,t) for the rod 3. 3 points A metal rod has a length of 10cm, and has its left end...
2. Solve the one-dimensional heat equation problem for a unit length bar with insulated ends with a prescribed initial linear temperature distribution: c2uxx = 111 , l4 (0,t)-14 (l,t)-0, 0 < x < 1 20-x) , Last Name A-M 3x, Last Name N -Z u(x,0) = The general solution to this problem is given in Example 4, page 563 in the text in terms of a Fourier Cosine Series. Write out the solution steps and evaluate the Fourier coefficients by...
(a) Consider the one-dimensional heat equation for the temperature u(x, t), Ou,02u where c is the diffusivity (i) Show that a solution of the form u(x,t)-F )G(t) satisfies the heat equation, provided that 护F and where p is a real constant (ii) Show that u(x,t) has a solution of the form (,t)A cos(pr)+ Bsin(p)le -P2e2 where A and B are constants (b) Consider heat flow in a metal rod of length L = π. The ends of the rod, at...
4. Consider the homogeneous heat-conduction problem wr =0, u(z,0)=f(x) (15) describing the temporal evolution of the temperature u(r, t) along a constant-thermal-diffusivity rod of length L whose end at x = 0 is held at zero temperature and whose end at r L is insulated (a) Introduce a separable solution of the form u-d(x) G(t) in (15) and find the two ODEs that govern φ(x) and G(t) and homoge- neous boundary conditions on φ(x). Take λ as the separation constant...
4. Which one of the following is the correct expression for one-dimensional constant properties, heat conduction equation for a cylinder with heat eady-e generation r dr qun 5. A 10 cm diameter sphere maintained at 30°C is buried in the earth at a place where the ·K. The depth to the centerline is 24 cm, and the thermal conductivity, k = 1.2 W/m earth surface temperature is 0°C. Calculate the heat loss from the sphere. (A) 25.3W (D)42.4W (E)20.0 w...