Subject: Re: Roark for fluids or heat transfer?
From: mmoran@lerc.nasa.gov (Matt Moran)
Date: Tue, 10 Sep 96 00:37:52 GMT
In Article <3231C4FC.4ACA@slip.net>, Andrew Hazelton wrote:
>Does anyone know of an equivalent to Roark's Formulas for Stress and
>Strain that solves problems in fluid mechanics and/or convective heat
>transfer? It would basically be a book that has a description of a
>geometry, say turbulent flow between flat plates, then a listing of
>different boundary conditions and the corresponding soltuion for
>pressure drop, force on the wall, convective heat transfer coefficient,
>etc.
>
>Thanks,
>Andy
>
>--
>Andrew Hazelton
>ajhazel@slip.net
>Nikon Research Corporation of America
The ones I tend to refer to most often that come close to fitting your
description:
Applied Fluid Dynamics Handbook, by Blevins, Van Nostrand Reinhold
Flow of Fluids, Tech Paper #410, Crane
Handbook of Heat Transfer Fundamentals, Rohsenow, et.al. eds., McGraw-Hill
Matt
Subject: Applied Concurrent Engineering Conference
From: "Mark L. Hartman"
Date: Mon, 09 Sep 1996 16:13:34 -0700
**************************************************************************************************************
First Annual Conference on Applied Concurrent Engineering
November 5-7, 1996
Red Lion Hotel, Seattle Airport
Seattle, WA
**************************************************************************************************************
For complete up-to-date information visit our Web-site:
http://www.ecrc.ctc.com/ace96/ace96a.htm
CONFERENCE OVERVIEW
ACE96 is the major forum for international industry, government, and
academia to exchange experiences on the application of information
technologies and business practices in concurrent engineering.
ACE96 promotes the tools, technologies, and methodologies that U.S.
businesses and manufacturers need to compete globally. The focus is on
industrial applications of concurrent engineering using innovative
business practices, electronic collaboration tools, life-cycle design,
and virtual prototyping.
CONFERENCE TOPICS
* Integrated Product & Process Design
* Environmentally Conscious Design & Manufacturing
* Collaborative/Distributed Design
* Concurrent Engineering in Quality Function Deployment (QFD)
* Concurrent Engineering in Customer-Driven Design
* Education in Concurrent Engineering
HOTEL INFORMATION
The Red Lion Hotel, at the Seattle Airport is the host hotel for the
First Annual Applied Concurrent Engineering Conference. The following
rates plus, applicable state and city taxes are offered:
Corporate Single $125.00
Double $135.00
Government Single $74.77
Double $86.00
These rates are also available three days prior and three days after the
listed meeting dates. The hotel accepts most major credit cards. For
reservations, contact the Red Lion Seattle Airport (1-800-RED-LION) and
request the group rate for Concurrent Technologies Corporation/ACE96.
In addition to the discounted rates the Red Lion Hotel offers
complimentary parking to overnight guests and discounted parking for
meeting attendees. Guests with Meeting validations pay $5 for 12 hours
of parking; Banquet validations pay $2; Restaurant or Lounge
validations receive 3 hours of complimentary parking. The hotel also
has a swimming pool, exercise room, and spa.
REGISTRATION
Pre-registration (by October 14, 1996) $375
Registration (after October 14, 1996) $475
Primary Author Registration $250 (speakers only; one per paper)
Full registration includes admission to ACE96 (November 5-7), banquet
ticket, coffee breaks, and one copy of proceedings.
For more information, e-mail: borenish@ctc.com, or call
(800) 282-4392 ext. 6521
Mark L. Hartman
Concurrent Technologies Corporation
4312 Kitsap Way, Suite 104, Bremerton, WA 98312
Phone (800) 478-3933
Fax (360) 478-0225
hartman@ctc.com
Subject: Re: WTB:Fax Modem 14.4 or up
From: bhat@civil.ubc.ca (Shankar Bhat)
Date: Mon, 09 Sep 1996 20:48:35 -0700
In article , bhat@civil.ubc.ca (Shankar Bhat) wrote:
> Hi:
> I am looking for a fax modem 14.4 or 28.8 bps with or without voice. It should be compatible with WIN 95 and should come with a manual. If you have on send me a msg. to bhat@civil.ubc.ca or call me at 822-2915.
>
> --
> Shankar Bhat
> Civil Engg. Dept., UBC.,
> Vancouver, Canada.
> bhat@civil.ubc.ca
Sorry folks, it is a mitake. I did not see which newgrougroup I was in. No flames please.
Thanks.
--
Shankar Bhat
Civil Engg. Dept., UBC.,
Vancouver, Canada.
bhat@civil.ubc.ca
Subject: Re: QUES:PLEASE HELP:Model for cracking whip
From: systech@polarnet.com (Ken Irving)
Date: Tue, 10 Sep 1996 04:13:17 GMT
In article , hinkey@pop.seanet.com says...
>
>Just to clear up a minor point about a whip making a cracking sound. The end
>of the whip does not travel at the speed of sound when it generates a small,
>weak shock wave which generates this sound. The whip is moving at a
>considerable speed, though subsonic, which is increasing very rapidly as the
>end unfurls. It's an unsteady gas dynamics problem. The air can't quite get
>out of the way fast enough as the end accelerates, building up compression
>waves in a local region until a weak shock wave is formed.
"The air can't quite get out of the way fast enough..." - isn't that due
to the speed of sound, i.e., the speed at which a disturbance can propogate
through the medium? Perhaps it is very near (or near enough) to the "speed
of sound? The analogy I use is water waves, where the analog to the speed
of sound is termed celerity (i think). A disturbance moving slower than
this speed will have waves going away from it, while something moving
faster (e.g., a boat) will be leading a v-shaped set of waves (wake). Don't
know how valid this is, but IMHO it (the whip sound) is very much related to
the "speed of sound".
Ken
Subject: Re: FEA: Modelling Bolt Holes
From: chrisw@skypoint.com (Christopher Wright)
Date: Mon, 09 Sep 1996 23:30:52 -0600
In article <5115cl$gsj@arl-news-svc-6.compuserve.com>,
<71531.3213@compuserve.com> wrote:
>I am currently using MCS/Nastran and have had to analyse a few models
which included bolted joints.
My approach is to clamp the parts together either node-to-node or with
kinematic constraints and not try modelling the bolts elastically.
Properly tightened, a bolt clamps the two surfaces together without
relative motion, anyway, otherwise the bolt wants to loosen and it'll fail
in fatigue. The force calculated at the bolt location is a lower limit for
the preload and therefore helps specify the torque.
If you're going to model the bolt as an elastic element you have to
include the preload, the friction (which can be done, but it's a needless
complication), compression only gap elements between the washers, the
head, the nut and the clamped elements and if you want to be totally anal,
the friction developed during torquing. Then when you're done, the bearing
stresses under the head and the nut will still be very high, but that's
the way it is in real life. You can include that by including the plastic
flow under the washer.
Christopher Wright P.E. |"They couldn't hit an elephant from
chrisw@skypoint.com | this distance" (last words of Gen.
___________________________| John Sedgwick, Spotsylvania 1864)
http://www.skypoint.com/subscribers/chrisw
Subject: ASME boiler and p.v. code question
From: pcc60136@teleport.com (Rob)
Date: Tue, 10 Sep 96 03:54:20 GMT
Thanks for all your previous help regarding code specs for braced and stayed
surfaces.
So far, I haven't had a chance to actually track down copies of the code. If
someone has it handy, would you mind sending a copy of the formula for braced
and stayed surfaces? I need to calculate the theoretical bursting pressure of
a stayed and/or braced surface in a power (locomotive) boiler given the UTS of
the plate, thickness of the plate, and spacing (pitch) of staybolts and/or
rivets.
I believe this will be found either in Section I, paragraph PG-46, or Section
VIII, paragraph UG-47. This type of construction might only be found in a 1980
or earlier version of the code.
Thanks in advance for taking the trouble to help.
Subject: Re: Roark for fluids or heat transfer?
From: Rikard GEBART
Date: Tue, 10 Sep 1996 07:14:52 GMT
Andrew Hazelton wrote:
>
> Does anyone know of an equivalent to Roark's Formulas for Stress and
> Strain that solves problems in fluid mechanics and/or convective heat
> transfer? It would basically be a book that has a description of a
> geometry, say turbulent flow between flat plates, then a listing of
> different boundary conditions and the corresponding soltuion for
> pressure drop, force on the wall, convective heat transfer coefficient,
> etc.
>
> Thanks,
> Andy
>
> --
> Andrew Hazelton
> ajhazel@slip.net
> Nikon Research Corporation of America
There is an old handbook originating in the former Soviet Union that I
have used a lot. I have also seen it at many places that I have visited.
Author: Idelchik (I think that the spelling is OK but there are also some
apostrophes involved)
Title: Handbook of Hydraulic Resistance (if I remember correctly)
Publisher: US Government (I do not remember exactly which body)
Maybe someone else reading this have easy access to a copy and can give the
exact coordinates???
The handbook contains friction factors for many technically important
geometries (and some very peculiar ones). There is nothing in the handbook
about heat transfer but it is still very useful. Depending on the situation
you may be able to draw conclusions about heat transfer by using Reynolds' analogy
between turbulen friction and heat transfer (be careful and read a good
text book about this if you do not know how to use it).
Another very good source (in german) is:
Title: VDI Warmeatlas
Publisher: Verein Deutsche Ingenieur Verlag
This contains a large collection of formulas for many different
situations. Extremely useful but you must be able to read german.
Finally there is a handbook series published in the UK.
Title: Heat Transfer and Fluid Flow Services (HTFS) Handbook
Publisher: Her Majestys Stationary Office (I think I got this right but
I can be mistaken). Check with AEA Technology, UK (they are on the
web).
This is a very large series of handbooks covering most aspects of heat transfer.
It can sometimes be a little difficult to use because of its size.
Hope this helps,
Rikard Gebart, CERN
Rikard Gebart
Subject: Re: Roark for fluids or heat transfer?
From: Rikard GEBART
Date: Tue, 10 Sep 1996 07:15:11 GMT
Andrew Hazelton wrote:
>
> Does anyone know of an equivalent to Roark's Formulas for Stress and
> Strain that solves problems in fluid mechanics and/or convective heat
> transfer? It would basically be a book that has a description of a
> geometry, say turbulent flow between flat plates, then a listing of
> different boundary conditions and the corresponding soltuion for
> pressure drop, force on the wall, convective heat transfer coefficient,
> etc.
>
> Thanks,
> Andy
>
> --
> Andrew Hazelton
> ajhazel@slip.net
> Nikon Research Corporation of America
There is an old handbook originating in the former Soviet Union that I
have used a lot. I have also seen it at many places that I have visited.
Author: Idelchik (I think that the spelling is OK but there are also some
apostrophes involved)
Title: Handbook of Hydraulic Resistance (if I remember correctly)
Publisher: US Government (I do not remember exactly which body)
Maybe someone else reading this have easy access to a copy and can give the
exact coordinates???
The handbook contains friction factors for many technically important
geometries (and some very peculiar ones). There is nothing in the handbook
about heat transfer but it is still very useful. Depending on the situation
you may be able to draw conclusions about heat transfer by using Reynolds' analogy
between turbulen friction and heat transfer (be careful and read a good
text book about this if you do not know how to use it).
Another very good source (in german) is:
Title: VDI Warmeatlas
Publisher: Verein Deutsche Ingenieur Verlag
This contains a large collection of formulas for many different
situations. Extremely useful but you must be able to read german.
Finally there is a handbook series published in the UK.
Title: Heat Transfer and Fluid Flow Services (HTFS) Handbook
Publisher: Her Majestys Stationary Office (I think I got this right but
I can be mistaken). Check with AEA Technology, UK (they are on the
web).
This is a very large series of handbooks covering most aspects of heat transfer.
It can sometimes be a little difficult to use because of its size.
Hope this helps,
Rikard Gebart, CERN
Rikard Gebart
Subject: Re: FEA: Modelling Bolt Holes
From: Tapio Leino
Date: Tue, 10 Sep 1996 10:39:12 -0700
71531.3213@compuserve.com wrote:
> Am I nuts, or what? Is there a simpler (yet still effective)
> way to model bolted joints? Is there a range of
> approaches applicable for the class of problem (shear loading,
> slip critical, tension only, bolting flanges, and
> so on....
> Anxiously awaiting a reply...
> Steve Sywak
There is an European project called COST/C1 where the structural
behaviour of joints is being studied (especially the behaviour
of the semi-rigid joints). In this project we made an analysis
test by giving the problem (a bolted beam-to-column connection
structure!) to several partners to be analysed using different
pieces of software that they had. Later, in a meeting we
discussed about the results of each try.
Unfortunately, the results were NOT anything to be proud of!
They diverged, and all kinds of problems concerning the modelling
were reported, including the ones mentioned in your message.
The problem with modelling the connections seems to be that:
- to make a good model one needs a lot of elements, which in
view of the nature of the problem seems like a waste
- the shell element models gave doubtful results which could
not be verified
- large models would require lots of gap elements which makes
it very difficult to model correctly
- the solutions diverged very easily
- all kinds of zero diagonal problems were met
- etc.
As a result I'd say that there are problems where FEM methods
work well, and then there are problems where I'd personally
prefer testing! The joint modelling is one of those!
Tapio Leino
VTT Buildning technology
Subject: Re: QUES:PLEASE HELP:Model for cracking whip
From: james
Date: Tue, 10 Sep 1996 17:43:41 +1100
In article , hinkey@pop.seanet.com
says...
>
>Just to clear up a minor point about a whip making a cracking sound.
The end
>of the whip does not travel at the speed of sound when it generates a
small,
>weak shock wave which generates this sound. The whip is moving at a
>considerable speed, though subsonic, which is increasing very rapidly
as the
>end unfurls. It's an unsteady gas dynamics problem. The air can't
quite get
>out of the way fast enough as the end accelerates, building up
compression
>waves in a local region until a weak shock wave is formed.
Are you sure about that. I have always understood that the tip did go
supersonic...
I have heard a lot of bullets down range , supersonic and sub-sonic, and
the supersonic ones sound 'just like a whip crack'...
I looked on the net and found the following extract which I have not as
yet
verified.
Professor Albert Shelkie (sp?), the Dean of Physics at Fairleigh
Dickenson
University sites the Journal of The Acoustical Society of America in
1958
as having done slo-mo and stroboscopic studies of the popping of the
whip. It does not strike itself, instead it demonstrates the
"conservation
of angular momentum" (the same thing that makes a figure skater's
pirouette speed up as he/she brings his/her arms in tighter) to
accelerate
the popper to a speed exceeding the speed of sound (1100 ft/sec, or
approx. 750 mi/hr in dry air at room temp) at which point it creates a
little sonic boom. They calculated the whip to go 1400 ft/sec or 900
mi/hr.
He showed photographs of the popper at the moment of truth and it is
clearly "slapping" the air to create the vacuum and resultant shock
waves.
James
Subject: ASME boiler and p.v. code question
From: pcc60136@teleport.com (Rob)
Date: Tue, 10 Sep 96 03:52:09 GMT
Thanks for all your previous help regarding code specs for braced and stayed
surfaces.
So far, I haven't had a chance to actually track down copies of the code. If
someone has it handy, would you mind sending a copy of the formula for braced
and stayed surfaces? I need to calculate the theoretical bursting pressure of
a stayed and/or braced surface in a power (locomotive) boiler given the UTS of
the plate, thickness of the plate, and spacing (pitch) of staybolts and/or
rivets.
I believe this will be found either in Section I, paragraph PG-46, or Section
VIII, paragraph UG-47. This type of construction might only be found in a 1980
or earlier version of the code.
Thanks in advance for taking the trouble to help.
Subject: California schools
From: mgangemi@rocko.lab.csuchico.edu (Matt Gangemi)
Date: 9 Sep 1996 17:44:28 -0700
I am a Mechanical Engineering major at CSU, Chico, and love the
engineering program here. However, I was thinking about moving to the bay
area, elsewhere in California, or possibly even Oregon. My question is,
what are the best schools in these areas for Mechanical Engineering.
I am interested in the most involved programs and employer preference, in
that order. I would appreciate any help anybody could give me.
--
-Matt Gangemi
Subject: Re: Vibration Specification
From: michael.mantai@srs.gov (M K Mantai)
Date: 10 Sep 96 10:49:30 -0500
In article <5114ip$lfq@nadine.teleport.com>, mdmiles@teleport.com (Michael
D. Miles, PE) wrote:
> I'm writing a purchase specification for a blower and the sample
> blowers we've tested all have some speed at which the rotor sets up an
> harmonic, causing some signifigant vibration of the entire blower
> housing and the equipment it is attached to.
>
> I'd like to add a spec line referring to the maximum allowable
> vibration (or balance which is more precise in this situation).
>
> Since vibration is defined frequency and amplitude(displacement), I
> can specify an amplitude limit over the entire speed range of the
> blower but I'm wondering if there might be other means of specifying a
> limit of vibration for the source device.
>
> If I try to characterize a balance specification, I'm not certain what
> is generally accepted for terms or description. Any suggestions?
You could specify maximum limits for velocity and/or displacement (e.g.,
in/sec or in) of the vibration. You could also specifify vibration
isolation mountings for the blower to isolate it from the equipment to
which it was attached.
--
Michael K. Mantai
Senior Engineer-Westinghouse/ "Hee Hee Hee Hee Hee Hee" - Scooby Doo
michael.mantai@srs.gov
************************************
Opinions expressed do not represent those of my employer or DOE...
and may not indicate an intelligent life form at the source.
Subject: Chair in Advance Engineering Design Available
From: Jim_Bugg@engr.usask.ca (Jim Bugg)
Date: 10 Sep 1996 12:44:31 GMT
DEPARTMENT OF MECHANICAL ENGINEERING
COLLEGE OF ENGINEERING
UNIVERSITY OF SASKATCHEWAN
invites applications for
NSERC/AECL CHAIR IN ADVANCED ENGINEERING DESIGN
This is a tenure-track position with appointment at the Associate
Professor or Full Professor level commensurate with the qualifications
and experience of the candidate. This research chair in the area of
advanced engineering design is jointly funded for a total one million
dollars over a three-year period by the Natural Sciences and
Engineering Research Council of Canada and Atomic Energy of Canada
Limited. The Chair could be extended to another five-year term.
The chair holder will have an engineering background (preferably in
Mechanical or Industrial Engineering) with considerable computational
and design expertise. The candidate should possess a Ph.D., have
industrial design experience and have a good research track record and
will take up this position on July 01, 1997, or as soon thereafter as
possible. The candidate should be qualified for registration as a
Professional Engineer in the Province of Saskatchewan.
The chair holder will be responsible for continuing the development
and management of an active research program in advanced engineering
design. The research projects currently underway include
knowledge-aided conceptual design methodology for mechanical systems;
modular design for assembly and upgrading; product life cycle cost
modeling; dynamic scheduling for large construction projects; design
for maintainability of large structures; product life cycle
configuration management. This research, involving the complete
design process, is inherently interdisciplinary in nature and broad in
scope. The chair holder is expected to assume a leadership role in
design research and to establish linkages with industry.
The Department has an Advanced Engineering Design Laboratory equipped
with networked workstations (SGI and HP) and several Dell Pentium
PC's, and advanced software systems for computer-aided design
research. A robotics and manufacturing laboratory also exists for
support work in this area.
The University of Saskatchewan, with over 18,000 full and part time
students, is housed in an attractive campus overlooking the South
Saskatchewan River in Saskatoon, a city of about 200,000 people. In
the College of Engineering, there are 72 faculty, 1150 undergraduate
students and close to 350 graduate students and excellent facilities
for research. Within the Mechanical Engineering Department, there are
20 faculty, over 200 undergraduate students and 80 graduate students
pursuing M.Eng., and M.Sc. and Ph.D. degrees.
The University of Saskatchewan is committed to the practice of
employment equity. In accordance with Canadian immigration
requirements, priority will be given to Canadian citizens and
permanent residents.
Please forward applications, including curriculum vitae and three
references to
Dr. Greg J. Schoenau, Professor and Head
Department of Mechanical Engineering
University of Saskatchewan
57 Campus Drive
Saskatoon, Saskatchewan, Canada S7N 5A9
http://www.engr.usask.ca/dept/mee
Greg_J_Schoenau@engr.usask.ca
Please followup to sci.engr.mech
--
Jim Bugg |----------------------------------|
Dept. of Mech. Eng. | Internet: Jim_Bugg@engr.usask.ca |
U. of Saskatchewan | Phone : (306) 966-5469 |
57 Campus Drive | Fax : (306) 966-5427 |
Saskatoon, Saskatchewan | Office : 2B44 Engineering |
Canada , S7N 5A9 |----------------------------------|