Does flow rate increase with velocity?
Bernoulli’s equation states mathematically that if a fluid is flowing through a tube and the tube diameter decreases, then the velocity of the fluid increases, the pressure decreases, and the mass flow (and therefore volumetric flow) remains constant so long as the air density is constant.
What happens when flow rate increases?
However, increase in fluid flow rate also leads to increase in pumping power (see Eqns (17), (18), and (24)). Therefore, increase in flow rate results in improved cooling performance at a cost of increased pumping power consumption.
Why do you need to minimize exhaust backpressure?
If you want to maximize horsepower, the thinking goes, you have to minimize backpressure. Consider the ultimate low-restriction exhaust system: A Top Fuel dragster like the one you see above.
How does reducing flow affect the pressure drop?
A smaller upstream orifice prevents sufficient liquid flow to achieve higher pressure. In these cases, except for the one at the top, a reduction in the size of the nozzle would result in the nozzle spraying a greater distance as the upstream restriction would provide reduced pressure drop because of the reduced flow.
What happens to air flow when static pressure is exceeded?
Once the static pressure specification has been exceeded, even if the fan continues to operate, the high static pressure will not let any more air in. In other words, the maximum static pressure has been reached, and air flow volume drops to zero. In real life, examples 1) and 3) are not realistic.
Is there a way to control both pressure and flow?
Under the right conditions, both pressure and flow control can be achieved using a restriction in the plumbing line. Partially open manual valves and fixed orifices of varying descriptions are commonly used to introduce a restriction in a plumbing line.