IAPWS backward equations

cdodge89 · December 2, 2014, 15:10

Hi everyone!

Looking through the forum titles I couldn't find a better place to put this question, so I'm going to ask here. If it should be somewhere else, let me know and I'll move it.

Does anyone know where I can find the IAPWS supplementary backward equations that are functions of

1. Temperature and enthalpy; f(T,h) and
2.Temperature and entropy; f(T,s).

Thanks in advance!

cdodge89 · December 8, 2014, 15:26

Anyone have any idea?

Ardalan · December 8, 2014, 19:11

because of the non-linearity of relations, I believe that no such equations can exist.
I had the same problem for my two phase code. I used some iterative method to solve the problem. But the computational cost is really annoying.

cdodge89 · December 9, 2014, 07:57

Yeah, that's why we want to find the backwards equations. We have found a number of the other backwards equations just looking through the ASME website at other publications, but the aforementioned ones eluded us. Thanks for the reply!

December 2, 2014, 15:10	IAPWS backward equations	#1
cdodge89 New Member Connor Dodge Join Date: Dec 2014 Posts: 3 Rep Power: 11	Hi everyone! Looking through the forum titles I couldn't find a better place to put this question, so I'm going to ask here. If it should be somewhere else, let me know and I'll move it. Does anyone know where I can find the IAPWS supplementary backward equations that are functions of 1. Temperature and enthalpy; f(T,h) and 2.Temperature and entropy; f(T,s). Thanks in advance!

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December 8, 2014, 15:26		#2
cdodge89 New Member Connor Dodge Join Date: Dec 2014 Posts: 3 Rep Power: 11	Anyone have any idea?

December 8, 2014, 19:11		#3
Ardalan Member Ardalan Join Date: Feb 2010 Location: Baku Posts: 50 Rep Power: 16	because of the non-linearity of relations, I believe that no such equations can exist. I had the same problem for my two phase code. I used some iterative method to solve the problem. But the computational cost is really annoying.

December 9, 2014, 07:57		#4
cdodge89 New Member Connor Dodge Join Date: Dec 2014 Posts: 3 Rep Power: 11	Yeah, that's why we want to find the backwards equations. We have found a number of the other backwards equations just looking through the ASME website at other publications, but the aforementioned ones eluded us. Thanks for the reply!