Hi, where in WWW I can find thermodynamic data (dynamic viscosity, conductivity, heat capacity) as tables or polynomial of temperature? First of all need for air. Thanks.

what about perry's chemical handbook ? DC

First of all, it would be helpful to know the range of conditions (pressure, temperature, density, humidity, contaminants) that you are interested in. Also, are you content to treat air as a uniform mixture, or are you using a multicomponent formalism?

Information on air is both voluminous and scattered all over the place. Where you look depends somewhat on the conditions of interest. Transport coefficients can be found in some editions of the Handbook of Chemistry and Physics published by CRC. Thermodynamic properties for dilute gases up to 6000 K have been collected in the JANAF tables for numerous species. These have been made available as polynomial fits by NASA, but I don't remember the URL or report number. There is a large amount of data scattered in the journals on atomic data, thermochemistry, and physical chemistry.

Happy Browsing!

JANAF tables:

Chase, et al. J. Phys. Chem. Ref. Data 3 (1974), p. 311, 1974 Supplement

Chase, eta l. J. Phys. Chem. Ref. Data 14 (1985), Supplement no. 1, parts I and II

The Thermal Connection has a lot of thermal data available on their site:

http://www.tak2000.com/

You can also download a trial version of a program called PhysProps from this site:

http://gpengineeringsoft.com/

I always wish this info can be compiled into one central website. If businesses and universities would stop hiding this basic data from the rest of the world, scientific advances would be drastically cheaper and come faster.

I feel if some rich person/company would buy the rights to all publications, then it will be the most significant scientific advance ever...

Check out the "CFD Calculators" on adapco-online.

http://www.adapco-online.com/cfdcalc.html

Regards,

Maria

How about

http://webbook.nist.gov/chemistry/

or

http://garfield.chem.elte.hu/Burcat/burcat.html

There is also a "Physical Properties Online Calculator" at http://members.aol.com/engware/calc1.htm .

Kind regards,

Maria

Thanks Ken for the websites.

I've seen and used the NIST site before. It provides useful information; however it is limited to only 33 common chemicals that are easily found in any CRC or Perry's handbook.

The Burcat site was new to me. It provides information on a lot of useful chemicals. Most seem to be computer estimates of ideal gas properties. Converting the estimated ideal gas properties to real properties at high temp or high pressure can provide very inaccurate results.

Thousands of people have made actual measurements of real properties (this was the focus of a large percent of the research done in the first half of the 1900s). I'd still love to have one convenient source to find this information. I've seen a few different places to buy this information (ranging from $3,000 to $10,000 for a list of the chemicals that they have researched). Unfortunately many small universities and small companies cannot afford $10,000 for a piece of data. Instead, they buy their own high pressure, high temperature vessel and spend a few weeks calculating the data themselves. This re-research of already known data is a huge waste of the World's research time and money.

I'm still dreaming of some government buying all that proprietary information and compiling it into one free source...

You can create property tables over user-specified temperature ranges for individual elements by going to the site

http://www.grc.nasa.gov/WWW/CEAWeb/

and then clicking on

Get Properties from NASA Coefficients (PFC)

This page is regularly updated and will allow you to create a printable version of any table created.

I should also have added that the site

http://www.grc.nasa.gov/WWW/CEAWeb/

(Get Properties from NASA Coefficients)

will automatically show you which compounds it has data for after you click on the individual elements. Also, air (i think always) is listed.

Some more useful sites:-

http://www.ppds.net/ or http://www.nel.uk/ppds (Physical Properties Data Service). Access over the web, or else buy the package for Windows, cost around £2000. It contains temperature/pressure dependent properties on around 1600 fluids. First few logins on the web are free. I've used it quite a lot, and it's very good.

Also try:-

http://tigger.uic.edu/~mansoori/Ther....Property_html

which has a list of property resources on the web.

Malcolm