# NASA format

 Register Blogs Members List Search Today's Posts Mark Forums Read

 October 19, 2002, 05:58 NASA format #1 Cujo Guest   Posts: n/a Hi, I want to use the coefficients that describe the specific heat capacity outside CFX5.5. These coefficients are given in the MATERIALS file (/cfx551/etc/). However, they are stated in the "NASA-format": SPECIFIC HEAT CAPACITY: Option = NASA Format Temperature Limit List = 300 [K], 5000 [K], 1000 [K] NASA Coefficient List = \ 0.03697578E+02, 0.06135197E-02, -0.01258842E-05,\ 0.01775281E-09, -0.01136435E-13, -0.01233930E+05,\ 0.03189166E+02,\ 0.03212936E+02, 0.01127486E-01, -0.05756150E-05,\ 0.01313877E-07, -0.08768554E-11, -0.01005249E+05,\ 0.06034738E+02 END #SPECIFIC HEAT CAPACITY What exactly is this format. It isn't just a1+a2T+a3T^2+a4T^3+a5T^4+a6T^5+a7T^6, because this gives me a heat capacity of O2 of 6.11e+13 at 300K, which of course is not correct. Can anybody help me? Cujo

 October 20, 2002, 08:28 Re: NASA format #2 Cujo Guest   Posts: n/a Hi, I found the answer myself: Only the first 5 coeffients are needed for the expression of the heat capacity. The first series of 5 coefficients in the CFX MATERIALS file are applicible for a temperature range of 300-1000[K]. The first 5 coefficients in the second block are for the range 1000-5000[K]. The heat capacity is obtained as: cp/Ru=a1+a2T+a3T^2+a4T^3+a5T^4 [J mol^-1 K^-1], with Ru the universal gas constant. Bye Cujo

 Thread Tools Display Modes Linear Mode

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is OffTrackbacks are On Pingbacks are On Refbacks are On Forum Rules

 Similar Threads Thread Thread Starter Forum Replies Last Post cynthia CFX 6 November 15, 2011 08:20 cbisw Main CFD Forum 9 May 30, 2011 02:38 t_shirt Main CFD Forum 0 June 15, 2010 14:39 Stone CFX 6 March 20, 2006 03:03 Stone CFX 2 February 7, 2006 11:17

All times are GMT -4. The time now is 23:27.