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Homework Statement
Problem is described as follows, I have a pressure vessel which basically consists of a hollow cylindrical body with two hemispherical shells attached to both ends. Within the vessel, there is a gas flowing from top to bottom. Over a period of one week, the vessel was subjected to changes in both temperatures and pressures (inlet and outlet).
I need to get how the stresses varied within the vessel (due to pressure and temp).
Homework Equations
Hoop stress
3-D heat conduction equation
The Attempt at a Solution
Both hemispheres and cylinders are thin, so at each time interval hence change in pressure I can calculate hoop stress using
σ=PD/2t.
However the thermal stress becomes a bit confusing as I am not sure how to model it/solve it.
I am simplifying the situation by ignoring the convective element of the fluid flowing and concentrating on conduction.
The heat equation is as follows
I can simplify my situation by converting the problem to 1-D such that my temperature function T will just be of t and r i.e. T = T(r,t).
My main issue is determining how to get ∂T/∂t.
Plotting my data collection against time doesn't really fit any equation trendline and just looks a bit erratic.
or do I assume T(r,t)=X(r)Y(t) and solve the PDE using separation of variables which if I remember correctly will eventually give me a Fourier Series which might complicate my situation. Is there any way to make this easier to do by hand rather than an FEA simulation?
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