Chapter 17. Unsteady-State Material and Energy Balances
Unsteady-state problems in previous chapters have used the overall or integrated accumulation term in the material and energy balances. Now we focus our attention briefly on unsteady-state processes in which the value of the state (dependent variable) as a function of time is of interest. Recall that the term unsteady-state refers to processes in which quantities or operating conditions within the system change with time. Sometimes you will hear the words transient state applied to such processes. The unsteady state is somewhat more complicated than the steady state, and, in general, problems involving unsteady-state processes are somewhat more difficult to formulate and solve than those ...
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