At 07:22 AM 7/26/2011, Damon Craig wrote:
The "by mass" and the "by volume" jargon that has evolved here--or
where ever--to describe steam quality is a bit screwy.
Not when you know what you are talking about. Each way of expressing
steam quality has its value.
In each case a volume is examined and "by mass" and "by volume" are
both unitless values.
"by mass" units: m/dx^3 / MdX^3
"by volume" units: dx^3/dX^3.
That's right. It's expressed as a percentage. If we want to know
vaporization rate, how much water was vaporized to make the steam, we
presumably want to know that in mass units. Strictly speaking, we
want to know how much was *unvaporized." That's what steam quality
percentages tell us, if it's mass percent.
However, suppose we want to know how the steam will look. Suppose we
have a measure of volume in some way. Then we'll be interested in
mass by volume. Steve Krivit went off on a tangent with this.
Everyone had been talking mass. But there were some assumptions being
made, that high wetness steam would somehow look very different from
low wetness. That doesn't happen until *very high mass percentage*
In no manner will there ever be 97% "by mass" steam in Rossi's
device that exits into the output tubing. This would take an
incredible amount of enegy to aggitate water to break surface
tension to this extent, and probably far greater than the fanciful
energy output calculated by Mr. Rossi. It takes energy to separate
water into little droplets. Go google surface tension. It takes a
great deal of energy to make a great deal of teenie-weenie droplets.
That's not to be established by mere assertion. And it's not
established by giving us a google search that gives over 8 million
hits. And just how large are the "droplets"? Nothing says they are
"teenie weenie." In practice, there is no sharp boundary between "wet
steam" and any other biphase mixture, i.e, some level of wet steam
above some level of liquid. Consider the liquid at the bottom a
"really big droplet."
"Wet steam" does usually refer to steam where the droplets are
suspended, but that's a generally unstable situation, I think, those
droplets will eventually grow and condense unless flow conditions
keep breaking them up.
Look, Damon, you screwed up. Don't keep compounding it.
