A closed steam boiler in a coffee machine idles at around 124 °C, the steam and water inside at 1.2 barg. When a steam valve is opened, steam rushes out through a steam wand inserted in milk, to aerate and heat it.
What I'm trying to determine is the flow rate of that steam, but all thermodynamic info on steam boilers I'm finding is for industrial situations and too complex for my very basic understanding of thermodynamics.
I'm disregarding any further heating from the boiler when the valve is open and am just assuming an infinitely big boiler with unlimited pre-generated steam
I'm thinking the steam tube cross sectional area is important, as would be the length and type of tube for losses. Can someone put me on the right track as far as formulae go.