Heat transfer problem - conduction in a cylinder

by ana111790
Tags: conduction, cylinder, fourier's law, heat transfer, transport phenomena
 P: 43 1. The problem statement, all variables and given/known data The following cylinder has a temperature inside Ti and temperature outside To. Using the general equation for heat conduction in a cylinder, write the temperature distribution equation as a function of the radius T(r). What is the temperature midway at r=a? (Take the heat conductivity = k, and length of cylinder is L). Assume no convection and constant temperature across the length of the cylinder. 2. Relevant equations Fourier's Law in cylindrical coordinates: q''= -k (dT/dr) 3. The attempt at a solution Boundary conditions: r=ri, T=Ti r=ro, T=To So integrating Fourier's equation with these boundary points I get: To-Ti= -roq'' ln(ro/ri) I think this gives the temperature difference though, not the distribution and I also have the q'' (flux term) still in the equation as an unknown. How would I find the temperature distribution and T(r=a)?
 P: 366 Steady-state, no heat generation for cylinder: d/dr(r*dT/dr)=0 integrate twice with respect to r: T(r)=C_1*ln(r)+C_2

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