Thermodynamics - Internally reversivble process

AI Thread Summary
The discussion revolves around the concept of internally reversible processes in thermodynamics, specifically using a scenario involving water flowing through a pipe with varying temperature and pressure. The user questions whether the described process, which starts at 50 ºC and 7000 kPa and ends at 450 ºC and 6000 kPa, can be considered internally reversible. Participants suggest that to determine reversibility, one must consider if the temperature and pressure gradients can be reversed with infinitesimal changes in initial conditions. The inquiry highlights the complexities of thermodynamic processes and the importance of understanding reversibility in engineering applications. Overall, the discussion emphasizes the need for clarity on the conditions that define internal reversibility.
Bruno Silva
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Hi everyone,

just created my account so this is my first post. I'm from Portugal and I'm studying Mechanical Engineering in FEUP.

So my doubt basically is about internally and externally reversible processes.

"Water is on a pipe with constant diameter initially at 50 ºC 7000kPa, and in the end of the pipe at 450ºC 6000kPa. Can this process be considered internally reversible? Why?"

Thanks
 
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Bruno Silva said:
Hi everyone,

"Water is on a pipe with constant diameter initially at 50 ºC 7000kPa, and in the end of the pipe at 450ºC 6000kPa. Can this process be considered internally reversible? Why?"
Welcome to PF Bruno!

Could you reverse the temperature and pressure gradient in the pipe by changing the initial conditions by an infinitesimal amount?

AM
 
Well i don't really know, that was a question in my exam..
 
Thread 'Confusion regarding a chemical kinetics problem'

Thread 'Confusion regarding a chemical kinetics problem'

TL;DR Summary: cannot find out error in solution proposed. [![question with rate laws][1]][1] Now the rate law for the reaction (i.e reaction rate) can be written as: $$ R= k[N_2O_5] $$ my main question is, WHAT is this reaction equal to? what I mean here is, whether $$k[N_2O_5]= -d[N_2O_5]/dt$$ or is it $$k[N_2O_5]= -1/2 \frac{d}{dt} [N_2O_5] $$ ? The latter seems to be more apt, as the reaction rate must be -1/2 (disappearance rate of N2O5), which adheres to the stoichiometry of the...
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