A narrow or restrictive exit will obviously create a lot of back pressure
(unwanted effect), but this in turn also means that the exhaust gases will have a higher escape velocity coming out of the engine (desired effect).
In a metering pump system, using a back pressure
valve alone does nothing to improve fluid flow.
Apart from the runner length, runner volume, collector, back pressure
and exhaust pulse, the physical shape of the manifold also has significant impact on exhaust velocity.
For good landings, pilots need to have what I call a fine pitch control--not too much, not too little back pressure
The back pressure
of blood in the aorta against the heart's aortic semilunar valve is higher than that against the pulmonic semilunar valve of the pulmonary trunk.
5 minutes, with the same separation quality and back pressure
of only 153 bar.
If the tank is located lower than the chilled water system piping, CV-5 and CV-6 could modulate to control back pressure
Blood vessels in the gullet had exploded because of back pressure
from my liver after drinking too much.
The leaked report stated the incident involved back pressure
in one of the furnaces.
Its flapper technology allows high pressures to be achieved (up to 116 psi) at large orifice sizes while preventing the fluid contamination that can result from spikes in back pressure
inherent in analytical devices.
VARICOSE VEINS These are knobbly swellings of veins where blood pools due to back pressure
and damage to valves within the veins that prevent backward flow of blood.
Black color streaks were present with increased back pressure
and when the color concentrate loading was increased from about 2 to 5%.