Consider the cylindrical$-$shaped systems in the figure below, comprising

two concentric cylindrical shells of thermally conductive materials $($red and blue$)$

enveloping a reactable fluid $($grey$).$ The values of radii are Ro$,$ R$1,$ and R$2.$ In scenario $($A$),$

the reactable fluid is in motion and thus its reaction not yet active; furthermore, the inner

and outer fluids have known convection coefficients $($hA and hB$)$ and bulk temperatures

$($TA and TB$).$ In Scenario $($B$)$ the reacting fluid stops and becomes active, thus generating

heat Qo and conducting it from its center towards the red cylindrical shell $($ko$).$ Find the

values of temperature at the interface between the two materials in Scenario A and

Scenario B$.$ Explicitly state all your assumptions.