Try to keep up. On Tue, Jul 26, 2011 at 10:10 AM, Abd ul-Rahman Lomax <a...@lomaxdesign.com>wrote:
> 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. >
