No coefficient of discharge is not constant. It is a function of many parameters like :
The ratio of the length of the orifice to diameter of orifice
Reynolds number
flow condition-whether it is increasing or decreasing
Pressure at the exit of the orifice (back pressure)
Orifice entry condition- like smooth entry, sharp edged entry etc.
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the coefficient is 46 and the constant is 0
15
coefficient
2. Although, technically, the coefficient, 5, is also a constant.
a constant is any regular number like 1,2,3,4, etc. a coefficient is any number with a variable so 1x,2x,3x,4x, etc. so im positive 7 is a constant