Oh, another observation - 28m/s is just over 100kmh... even as an airflow that would be somewhat noticeable.
"Somewhat noticeable"?? According to the link that I put into my original
message (scale used in weather reporting) it is a "violent storm"!
http://en.wikipedia.org/wiki/Beaufort_scale
Scroll down to the table and find an entry that corresponds to 28m/sec.
Btw, after some thinking, we need to make some upward adjustment to
my calculation.
I calculated the volume production of the steam as 2.36 liter / sec at STP (standard temperature and pressure). The current version of IUPAC's standard is a temperature of 0 °C (273.15 K, 32 °F)
However, 0C vapor would only exist in very diluted state in some other gases.
If we are talking about pure steam, its temperature have to be 100C or above.
So we need to talk volume at 100C. Since all gases expand with temperature increase, we have to apply Clapeyron's law:
PV=nRT
where n is the amount of substance of gas and R is the ideal, or universal, gas constant, equal to the product of Boltzmann's constant and Avogadro's constant. In SI units, n is measured in moles, and T in kelvin. R has the value 8.314 J·K−1·mol−1.
Given that n,R and P are constant, and temperature is changing from
T1 to T2, we get volume change:
V1 = nRT1/p
V2 = nRT2/p
V2/V1= T2/T1
For T1=273 K (0C), and T2 = 373 K (100C) we get
V1/V2 = 1.37
This increases the volume rate estimate from
2.36 liter / sec to 3.23 liter / sec.
This changes the exhaust rate from 5 mm radius pipe from
29.87 m /sec
to
40.9 m /sec
Our Rossi-weather just got upgraded from violent storm to
a hurricane (e.g ≥ 32.7 m/s = Hurricane by Beaufort scale).
So why are we seeing only puny wisps of water that are floating
and curling their way at some lazy centimeters / sec?
Looking at it, they appear to be even less than expected for electrical
heating coil of 750 W.
Ah, but there is an explanation! If all the water that is coming into
the machine is not getting anywhere, but just accumulating withing
the apparatus (which was empty before) it has to be heated! So the
coil's heating power is getting used to warm up the accumulating water
instead of producing steam. Once the apparatus is full, of cause
the "demonstration" has to be restarted (that is why they don't last very
long, at least not with continuous supervision which would prevent
quickly emptying the water from the casing)...
Regards,
Yevgen