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Finding enthalphy for tee junction

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Old   April 29, 2020, 01:39
Default Finding enthalphy for tee junction
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dhanik
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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.
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Old   April 29, 2020, 05:05
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You need an equation of state. If you are doing a simulation of some sort, the equation of state is a user setting.
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Old   April 29, 2020, 05:28
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Hi sir , thanks for reply I want to find h hot and h cold manually
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Old   April 29, 2020, 08:58
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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.
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Old   May 1, 2020, 05:53
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Thank you, sir, I did it with Cp *delta t where Tref is 298.15K
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