Timeline for First law of thermodynamics, steady flow energy equation (SFEE) and $Vdp$ work
Current License: CC BY-SA 3.0
24 events
| when toggle format | what | by | license | comment | |
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| Sep 7, 2018 at 19:01 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
| Aug 8, 2018 at 0:02 | history | bumped | CommunityBot | This question has answers that may be good or bad; the system has marked it active so that they can be reviewed. | |
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| Mar 31, 2018 at 13:14 | answer | added | pglpm | timeline score: 0 | |
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| Jun 16, 2017 at 16:31 | comment | added | Chet Miller | No. It is independent of any process and any physical system. It is a physical property relationship of the material, for any specified parcel of material. If you want to interpret that as a closed parcel of material, that's fine. | |
| Jun 16, 2017 at 14:54 | comment | added | user158324 | @Chester what you are saying is that it is independent of whether it is a reversible process or an irreversible process but the process must occur in a closed system...not open system. | |
| Jun 15, 2017 at 19:32 | comment | added | Chet Miller | This equation is a general physical property relationship that is satisfied by the changes in s, h, and p between neighboring thermodynamic equilibrium states, and is independent of any process. | |
| Jun 15, 2017 at 12:36 | comment | added | user158324 | @chester I totally understand the first law for open and closed system... Its a fundamental thing...but what I ask is that this particular relation TDs=dh + Vdp is defined for a non flow process then why is it being applied to a flow process...is it because its steady process and since property at any point in space does not change with time... then we consider control volume as control mass ? | |
| Jun 15, 2017 at 11:49 | history | edited | Qmechanic♦ | CC BY-SA 3.0 |
added 15 characters in body; edited title
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| Jun 15, 2017 at 11:47 | answer | added | Rishabh Jain | timeline score: 1 | |
| Jun 15, 2017 at 11:42 | comment | added | Chet Miller | Have you learned about the open system (control volume) version of the first law of thermodynamics. This version of the first law is derived, based on the closed system version. You are aware that, in the open system version, the work is split into two separate parts: (a) work to push fluid into or out of the control volume and (b) shaft work, correct? | |
| Jun 15, 2017 at 10:51 | comment | added | user158324 | I don't understand how first law defined for a closed system dQ = dU + dw...here considering only pdV work..is applied to steady flow energy equation which is an open system...you can see in the second image...it says using property relation eq 7.41.....but 7.41 was defined for a closed system... | |
| Jun 15, 2017 at 8:36 | comment | added | Rishabh Jain | First law of thermodynamics is valid everywhere.What exactly do you want to ask? | |
| Jun 15, 2017 at 6:54 | history | asked | user158324 | CC BY-SA 3.0 |