Fanno Flow Formula

Equation for calculate fanno flow is,

(s - s_i) / c_p = ln[ (M / M_i)^((γ-1)/γ) * ((1 + ((γ - 1) / 2) * M_i²) / (1 + ((γ - 1) / 2) * M²))^{((γ+1)/(2*γ))}]

Where,
(s - s_i) / c_p = Fanno Line Flow Condition with Entropy
s = Subsonic Flow
s_i = Initial Subsonic Flow
c_p = Constant Pressure
M = Mach Number
M_i = Initial Mach Number
γ = Heat Capacity Ratio