# Finding enthalphy for tee junction

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 April 29, 2020, 01:39 Finding enthalphy for tee junction #1 New Member   dhanik Join Date: Oct 2019 Posts: 10 Rep Power: 5 I am simulating tee junction, 2 inlets and 1 outlet, hot inlet temp is 36 c & cold inlet temp is 19 c, hot inlet velocity is 3 m/s and cold inlet velocity is 12m/s By simulation, I get 2559.11 J/kg enthalpy at an outlet , How to find enthalpy at an outlet by equation Formula is h(mixing)=m(hot)*h(hot)+m(cold)*h(cold)/m(total) How to find h hot and h cold? Material is air Last edited by Dhanik desai; April 29, 2020 at 05:28.

 April 29, 2020, 05:05 #2 Senior Member   Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,246 Rep Power: 63 You need an equation of state. If you are doing a simulation of some sort, the equation of state is a user setting. Dhanik desai likes this.

 April 29, 2020, 05:28 #3 New Member   dhanik Join Date: Oct 2019 Posts: 10 Rep Power: 5 Hi sir , thanks for reply I want to find h hot and h cold manually

 April 29, 2020, 08:58 #4 Senior Member   Join Date: Jul 2009 Posts: 337 Rep Power: 17 You will need to use the equation of state to evaluate the enthalpy by hand. For this you need thermodynamics, but here's a hint. For air at the temperatures you are working with the enthalpy can be expressed to a high degree of accuracy as h = Cp * T, where Cp is the specific heat at constant pressure. Dhanik desai likes this.

 May 1, 2020, 05:53 #5 New Member   dhanik Join Date: Oct 2019 Posts: 10 Rep Power: 5 Thank you, sir, I did it with Cp *delta t where Tref is 298.15K

 Tags cfd - post, flow analysis, simulation cfd, thermal analysis