How can one determine that the flow rate of the exhaust stack has decreased by reading the pressure gauge on it? !
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Does a decrease in the gauge reading mean that the flow rate decreases as well? The reading of the pressure gauge should be the static pressure. And flow rate corresponds to velocity, which is dynamic pressure. Can it be determined that the flow rate has decreased from the pressure gauge reading?
I think it can be understood this way; let’s see what the experts have to say
It can be said that this can be explained through Bernoulli’s equation
By conservation of energy, pressure points outside the chimney at ground level and inside the chimney are taken as reference points. With constant external energy, the lower the pressure at the internal pressure measurement point, the greater the kinetic energy and pressure loss, and the higher the velocity.
It depends on where the pressure measurement point is located. If static pressure is being measured, then there is little change in static pressure when the flow rate changes.