(5-95) argon steadily flows into a constant pressure heater at 300 k and 100 kpa with a mass flow rate of 6.24 kg/s heat transfer in the rate of 150 kw is supplied to the argon as it flows through the heater. (a) determine the argon temperature at the heater exit, in ℃. (b) determine the argon volume flow rate at the heater exit, in m3/s.

a) 346.22 K

b) 4.49 m³/s

Explanation:

P₁ = P₂ = Pressure in heater = 100 kPa

T₁ = Initial temperature = 300 K

m = Mass flow rate = 6.24 kg/s

Q = Heat transfer rate = 150 kW

Cp = Specific heat at constant pressure of argon = 0.520 kJ/kg K

R = Gas constant of argon = 0.2082 kJ/kg K

a)

∴ The argon temperature at the heater exit is 346.22 Kelvin

b)

∴ Argon volume flow rate at the heater exit 4.49 m³/s

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force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach