The air velocity from a tyre valve pumped to 200 kPa (29 psi) can be calculated using the Bernoulli equation under the assumption of incompressible flow. While the flow may not reach choked conditions, which occur around 65 psi, the mass flow can be determined by plotting the density as a function of time and calculating the flow area of the valve. The discussion also explores the dynamics of the tyre's propulsion as air escapes, noting that the tyre will eventually stop when the mass flow out equals the decreasing pressure.
PREREQUISITESEngineers, physicists, and students in fluid dynamics or mechanical engineering who are interested in the principles of air flow and pressure dynamics in tyres and similar systems.
I suppose I should have paid attention to the pressures. Whoops.russ_watters said:200 kpa is 29 psi, isn't it? So it isn't anywhere near choked flow, which, iirc, is somwhere around 65 psi.