tag:blogger.com,1999:blog-1639738090545138933.post8981715761049335198..comments2024-02-07T10:25:05.837-05:00Comments on Home Climate Analysis: Pressure Energy and GravityKevan Hashemihttp://www.blogger.com/profile/11014582378376549743noreply@blogger.comBlogger2125tag:blogger.com,1999:blog-1639738090545138933.post-33598654685558536982011-06-05T11:32:04.516-04:002011-06-05T11:32:04.516-04:00Dear Michele,
Thank you for your comment.
In my...Dear Michele,<br /><br />Thank you for your comment. <br /><br />In my college fluid mechanics text book, which I rather like, it says we include all forms of energy in the enthalpy of a cell, so we have:<br /><br />H = CpT + gz + 0.5*u^2 <br /><br />where u is speed. For an incompressible fluid they often ignore the temperature term because it does not change with flow:<br /><br />H = pV + 0.5*u^2<br /><br />from which we obtain Bernoulli's equation. So it seems to me that "enthalpy" is a general-purpose term that means "energy required to replace the gas in the state it is in at this point in the flow".<br /><br />Yours, KevanKevan Hashemihttps://www.blogger.com/profile/11014582378376549743noreply@blogger.comtag:blogger.com,1999:blog-1639738090545138933.post-3530188646173314572011-06-03T04:49:14.393-04:002011-06-03T04:49:14.393-04:00If you like it, I suggest to name “potential entha...If you like it, I suggest to name “potential enthalpy” the term Cpθ = CpT+gz . <br /><br />The enthalpy CpT is a thermodynamic function of state whereas gz is a gravitational function, i.e., they are things very different. <br /><br />Besides, the atmospheric physics usually use the “potential temperature” θ = T+gz/Cp and we wouldn’t introduce any innovation.<br /><br />MicheleAnonymousnoreply@blogger.com