Air enters a constant-area duct with heat transfer q per unit mass flow rate through the duct....

Question

Air enters a constant-area duct with heat transfer q

per unit mass flow rate through the duct. Assuming the flow

is frictionless, calculate

(a) the external heat transfer, q∗

1, that will choke the

Duct

(b) the reset inlet Mach number, M1′ , if q = 3q∗

1

(c) percentage mass flow rate reduction if q = 3q∗

1

Dr Shweta · Accepted Answer

Solution
Given: 
M1 = 0.6, Tt1 = 700K, ? = 1.4 and R = 287 J/Kg. K
To calculate:
a) External heat transfer = q∗1, which will choke the duct
(b) Reset inlet Mach number = M1′ when if q = 3q∗1
(c) Percentage mass flow rate reduction if q = 3q∗1
Solution: 
a) external heat transfer, q∗1, that will choke the duct 
        q∗1 = cp (T∗t − T∗t1)
where, cp is the specific heat at constant pressure which is calculated as 
cp = ?

Air enters a constant-area duct with heat transfer q per unit mass flow rate through the duct. Assuming the flow is frictionless, calculate (a) the external heat transfer, q∗ 1, that will choke the...

Solution

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