Countercurrent Cooling in Tubular Reactors with Exothermic Chemical Reactions

4-4 COUNTERCURRENT COOLING IN TUBULAR REACTORS WITH EXOTHERMIC CHEMICAL REACTIONS 

This is the most mathematically demanding situation because the inlet condition for the cooling fluid (i.e., Tcooi = Tcooi, inlet) is known at the far end of the doublepipe reactor at z = L, whereas the inlet conditions for the reactive fluid (i.e.. 

COUPLED HEAT/MASS TRANSFER IN NONISOTHERMAL REACTORS 

Trx = Trx, inlet) are available at z = 0. This is known classically as a split boundary value problem, and it is characteristic of countercurrent flow heat exchangers. When numerical methods are required to integrate coupled mass and thermal energy balances subjected to split boundary conditions, it is necessary to do the following  

Step 1. Guess the outlet temperature of the cooling fluid at z = 0. 

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