So in a lumped parameter system, we use the ln(Θ)=exp(-hAt/ρVc), where Θ is non-dimensional temperature.(adsbygoogle = window.adsbygoogle || []).push({});

This expression has 't' i.e. time in it. So does this mean it is used only for transient problems?

Also, does the Biot number Bi tell us anything about whether a problem is in transient or steady state, or is that entirely determined by Fourier number Fo?

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# Biot number-does it tell us if a problem is transient or steady state?

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