Newsgroup sci.mech.fluids 3061

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On Thu, 14 Nov 1996 14:38:55 -0800, Tom_Austin
 wrote:
>Maybe it's a generational/geographical thing.  I'm 35, and in all my
>time in the workplaces, and all the places I've worked, Drafter and
>Designer are the standard terms, even by the Old Guard guys, who are
>traditionally sexist in every other way.
Do you see what I mean by the baggage of our perceptions?  Here we
have the perception being put forward that "the Old Guard guys, who
are traditionally sexist in every other way".  I don't believe there
is any malice involved, just that that is the perception you have.  As
you can see, this colours the way you see things.  In the same way,
those who see the three letters M, A and N used in sequence feel
offended by it because they have the perception that its use somehow
demeans females.  Even of the letters were C, A and T, or D, O and G,
a similar situation would result.  Similarly there are people equally
offended when the letters MAN are replaced by PERSON or something
else, or the work changed entirely.
We need to understand that the word is not the problem, it is simply a
convenient hook to hang your coat on.  When we understand this, maybe
we will start to resolve things.
Regards,
Ian A. White, CPEng
waiwhite@zip.com.au
WAI Engineering
Sydney 2000
Australia

I was assistant city engineer of a small midwestern town awhile back...I'll 
never forget a conversation I had with the (male) personnel director one time.  
I told him there was a better expression than "workMAN's comp"--plenty of 
people who worked in the city weren't men.  He was absolutely 
bewildered--"worker's comp" had never occurred to him.  Moral of 
story--people will sometimes go for the sexist title even when it's a more 
awkward locution (like "draftsman" instead of "drafter").
Carolyn Dougherty
carolyn@accesscom.net
"At last," cried Emerson.  "Free from forges, farms and factories.  How I long to 
write my masterpiece!"  "No," said Thoreau, "let's go drinking."   _Dreams_

(Peter Skelton) writes:
> I'm married to the drafting supervisor at a local plant. She flatly prefers
> drafter or draftsperson but wouldn't make an issue of it, after all there
> are real problems to be dealt with. 
> 
> As I want to stay married another twenty years, I'll be polite. 
> 
> Most sexism is lazyness, insensitivity or stupidity. There is a slight
> possibility that your drafter considers you incorrigible in that way and
> dosen't feel you're worth the emotional energy and career risk involved.
But, but .... but, the word "draftsman" is just a title, meaning
*one* who drafts.  There is not gender associated with it at all.
If one were to train a dog or cat to draft, it's still an appropriate
title.
Do not underestimate your abilities.  That is your boss's job.
It is your job to find ways around your boss's roadblocks.
_______________________________________________________________
Glen Appleby  glena@bbs.cruzio.com  http://www2.cruzio.com/~glena/

I use 8 micron hollow glass spheres for seeding water in PIV applications. They
are sold by  Potter's Ballotini in the UK. The tradename is Sphericel and they
have a nominal density of 1.1 g/cc (range 0.8 to 1.4 g/cc). You can try
separating them in a centrifuge or you may condsider using a glycerol and water
test fluid.
My (old 1992?) data sheet gives the US address as:
Potters Industries Inc
20 Waterview Boulevard
PArsippany NJ 07054
Tel: (201) 299-2900
Fax: (201) 335-9350
You might get better advice if you described the flow you are investigating and
your proposed illumination system. I think you will have problems with
particles much smaller than the size you suggest.
TSI will sell you some very expensive silver coated hollow glass spheres with
roughly the same mean diameter and density. I think Potters now sell something
similar as a component for odd conducting polymer mixes(?) If you feel braver,
the following reference gives a method for making your own silver coated
particles.
@ARTICLE{schmitt95a,
        AUTHOR             = {T. Schmitt and J. N. Koster and H. Hamacher},
        JOURNAL            = {Meas. Sci. Technol.},
        KEY                = {piv},
        NUMBER             = {6},
        PAGES              = {682-689},
        TITLE              = {Particle design for displacement tracking
velocimetry},
        VOLUME             = {6},
        YEAR               = {1995}
}
Cheers,
	Andy
Mr Andrew Hind,              WWW: http://www.chemeng.ed.ac.uk/people/andy/
Department of Chemical Engineering,               Email: A.K.Hind@Ed.Ac.Uk
Edinburgh University, The King's Buildings,       Phone: +44 (0)31650 4857
Mayfield Road, Edinburgh, Scotland, EH9 3JL.      Fax:   +44 (0)31650 6551

Rikard GEBART  wrote:
(snip)
>I remember reading in a Swedish newspaper many years ago of a system for houses where a salt
>was used to absorb heat from the indoor air during the (warm) day. This was accomplished
>by melting of the salt (phase change). During the night when the temperature decreased
>the salt solidified and released its heat again to the indoor air, thereby saving some
>energy for heating. I have not heard anything recently about this system so I assume 
>that it is not competitive to ordinary heat exchangers and similar systems which are
>widely used in Sweden. It is possible that the same system could be used for engine
>heating. The newspaper article probably mentioned what salt they used but I have no clue.
>Its melting point has to be somewhere close to room temperature (20 degree C). Maybe a
>chemist can tell you which salt would be suitable.
Yes, but the "melting" point should be at about 80C and boiling higher than 120C
>Finally, if you just want to have something for your own car you should definitely buy
>existing equipment and not build something yourself. If you buy it in Europe the cost
>of a complete solution with engine and passenger compartment heating and a timer would
>probably be less than the cost of the parts only for something you build yourself (not
>mentioning that the reliability and safety would be much higher).
Well, I agree in general. But you have to know I'm a mechanical engineer with
own design and prototyping business working for medical and automotive
industrie. I guess I'd manage to calc., design and manufacture a proper heat
exchanger, fill it with the apropriate liquid and mount it in a car. Moneywise I
completely agree.
>If, on the other hand, you want to invent something new you may have a pretty interesting
>idea....
Unfortunately it's developed already :-(
Only seems to be not too popular and cost/value for the user is not
overwhelmingly great. I suspect there are some problems with keeping the liquid
absolutely clean so it doesn't crystalize when the temperature drops but does so
when I start the car. I'll do some patent research ad see how BMW and other
manufacturers did it.
Thanks for all the interesting replies so far,
Frank

Steven Vogel  wrote:
>Somehow I recall work going on at the Engineering School of Tufts 
>University, under Dr. Iannos Mioulis.  You might contact him; they were 
>using lithium bromide and water.  Adding water gives a lot of heat; 
>using engine heat after warm up can cook the water off again for the 
>next cycle.  Lithium bromide has been used for quick-heat packages of 
>food as well.  
Lithium bromide sounds very poisonous. But when it's used in dischargable
packages for food it can't be. Maybe a chemist can clearify and say something
about that "stuff"? Does it change phases and can this process be initiated at a
low temp so it heats up anytime?
Greetings,
Frank

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Some people prefear to go on thinking that the Einstein’s relativity
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