2022 20th: Lisbon

  20th IATP Meeting, July 9th 2022 




             The meeting was opened by the Chairman, Prof. Sir William Wakeham, who welcomed all present and thanked Prof. Fernando Caetano, Prof. Carlos Nieto de Castro and Ms Carolina Sequeira, as the local organisers of the meeting, for the excellent arrangements.

The meeting was divided into the usual scientific session and business session. The proceedings are recorded here in that order.



2.1   Thermophysical Properties of Liquids with Dissolved Gases by Dynamic Light Scattering and Molecular Dynamics Simulation

     T Klein, M. Piszko, F. Lenahan, M. Kerscher, M.H. Rausch, T.M. Koller, and A.P. Fröba (Germany)


2.2    Measurement and Prediction of the Effective Thermal Conductivity of Dispersions with a Liquid Continuous Phase

           F. Bioucas, M.H. Rausch, T.M. Koller, A.P. Fröba (Germany)


2.3    Viscosity Measurements of Organic Liquids at Ambient Pressure with a Capillary Viscometer

R. Kanitz (Germany), A. Laesecke (USA), K. Meier (Germany)


2.4      Viscosity of Alternative and Synthetic Fuel Surrogates

Carsten Wedler, M.J.P. Trusler (UK)


2.5    Water-Free Thermophysical Properties of Ionic Liquids and their Mixtures with Water – A Necessary Consensus

           C.S.G.P. Queirós, X. Paredes, F.J.V. Santos, A.F. Santos, M. J. V. Lourenço, C.A. Nieto de Castro (Portugal)


2.6    Thermophysical Properties of Eutectic Gallium-Indium-Tin Alloy Revised

M.J. Lourenço, F.J.V. Santos, V. Nunes, M. Alves, C.A. Nieto de Castro (Portugal), R. Mondragón and L. Hernández (Spain), R. Künanz, C. Hanzelmann, S. FejaM.H. Buschmann (Germany)


2.7    Measurements of the Thermal Conductivity of Hexadecan-1-ol and Octadecan-1-ol in the Solid and Liquid Phases

D. Velliadou, K.D. Antoniadis, M.J. Assael (Greece), W.AWakeham (UK)


2.8   Comments about the Use and Misuse of “Excess properties” Terms in Mixture Thermophysical Properties Data Presentation and Analysis

C.S.G.P. Queirós, X. Paredes, F.J.V. Santos, A.F. Santos, M.J.V. Lourenço, C.A. Nieto de Castro (Portugal)


2.9      General One-Parameter Friction Theory Model for Thermal Conductivity

K.A.G. Smith, S. Pollak, S.E. Quinones-Cisneros (Germany)


2.10    Linking Viscosity to Equations of State Using Residual Entropy Scaling Approach

X. Yang (Germany), X. Xiao (Australia), I. Bell (USA), M. Thol, M. Richter (Germany)


2.11   Prediction of Fick Diffusion Coefficients of Quaternary Liquid Mixtures by Molecular Dynamics Simulation

G. Guevara-Carrion, R. Fingerhut, J. Vrabec (Germany)


2.12  Solid-liquid phase equilibrium: in search of suitable PCMs for low temperature energy storage

M.C.M. Sequeira, F.J.P. Caetano, H.A.P. Diogo, J.M.N.A. Fareleira (Portugal)


2.13    The Torsional Quartz Crystal Viscometer Again

           W.A. Wakeham, S. Richardson (UK)


 Each presentation engendered discussion and a few points of special interest are noted here:


 a)   Theoretical:

-       An interesting discussion on the use of the term “Excess property” as applied in mixtures, was presented by C.A. Nieto de Castro.

-       S.E. Quinones-Cisneros discussed the use of the one-parameter friction theory to successfully model the viscosity from the triple point temperature to high temperatures and pressures. However, when applied to the modelling of the thermal conductivity, at present five parameters were necessary

-    X. Yang described a successful EoS residual entropy scaling approach for modelling the viscosity of 124 pure refrigerants, extended with a simple mixing rule, to 351 mixtures. Attempts to applied to the thermal conductivity are in progress.

-       Current progress in predicting diffusion coefficients in quaternary liquid mixtures by molecular simulation, was presented by G. Guevara-Carrion.

-     W.A. Wakeham presented a very interesting investigation on the theory of the torsional quartz-crystal viscometer, and especially on the fact that the two working equations do not produce the same answer.


b)   Measurements & Instruments:

-     New DLS measurements of binary mixtures of n-hexadecane with some dissolved gases were presented by T. Klein. These were successfully described by employing EMD simulations.

-     A modified parallel-plate instrument for measuring the enhancement of the thermal conductivity in nanofluids was presented by F. Bioucas. Measurements performed were employed to test the validity of a recently developed model by this group.

-       Low-uncertainty viscosity measurements, performed in a capillary viscometer (SI Analytics), over a wide temperature range for toluene, isooctane, and n-pentane were presented by R. Kanitz.

-       C. Wedler presented an interesting presentation on biological fuels (biodiesel, hydrotreated vegetable oils…), and synthetic fuels (E-fuels, e.g. methanol/ethanol, OME, liquid organic hydrogen carriers…). Following this he presented recent measurements of the viscosity and density of two biodiesels (Methyl Dodecanoate and Ethyl Tetradecanoate).

-       M. Buschmann showed new measurements of the density, heat capacity and viscosity of the eutectic gallium-indium-tin alloy in the solid and liquid phases and discussed their comparison with other existing data.

-       M.C.M. Sequeira presented solid-liquid phase equilibrium results of two eutectic systems, n-decane+n-dodecane and diethyl+dibuthyl esters, in search of a suitable PCM system for low-temperature energy storage.

-       D. Velliadou presented a new THW sensor for accurate measurements of the thermal conductivity of hexadecan-1-ol and octadecan-1-ol, in the solid and liquid phase. Measurements in the solid phase were particularly interesting, as the THW sensor was embedded in the molten solid phase, reducing effects of contact resistance between sensor wires and solid.


c)    Reference values/Correlations:

-    C.A. Nieto de Castro discussed the necessity of water-free values for the thermophysical properties of ionic liquids, and he further discussed reference data and correlations for viscosity of  [C6MIM][(CF3SO2)]N once corrected for water.








The following projects were concluded:


1. Reference correlations for the viscosity and thermal conductivity of D2O over extended temperature and pressure ranges.

  M.J. Assael (Greece), M.L. Huber, R.A. Perkins, J.V. Sengers (USA), R. Hellmann (Germany).


   M.J. Assael informed IATP that the viscosity correlation has been concluded and published.


2. High-temperature high-pressure viscosity standards

    J. Fernandez (Spain), J.M.N.A. Fareleira, F. Caetano (Portugal), W. A. Wakeham, J.P.M. Trusler (UK), A.P. Fröba, A. Lei­pertz, B. Rathke (Germany), K. Harris (Australia), A. Laesecke (USA), K. Schmidt (Canada), Chr. Boned (France)


    Project will stop because interest has diminished. K. Schmidt will lead the effort to prepare a conclusion/review/summary for publication of the work IATP members involved have performed in this project.


3.  Diffusion nomenclature for  the IUPAC document  Definitions of Symbols & Units

A.P. Fröba (Leader), T.M. Koller, C. Giraudet (Germany), V. Shevtsova (Belgium)W.A. Wakeham (UK), K. Harris (Australia).


Project stops from IATP point of view.  The IUPAC situation is unknown..


4.  Reference correlation for thermal conductivity and viscosity of molten salts

K. Tasidou, M.J. Assael (Greece), W.A. Wakeham (U.K.), M.L. Huber, M. Troy (U.S.A.).


Project is concluded and all results have been published.


5. Commonly Asked Questions in Thermodynamics”, 2nd Edition

  M.J. Assael (Greece), W.A. Wakeham, G. Maitland (UK), S. Will, Th. Maskow (Germany), U.V. Stockar (Switzerland)


      Project is concluded. The book is to appear for sale, on August 5th, 2022.


6.   Problems associated with the low-density application of the THW technique.


S. Mylona (Canada), E. May (Australia), R. Perkins (USA), M.J Assael (Leader), K. Tasidou (Greece), W.A. Wakeham (UK)


Project stops. No available personnel to run it..





The following projects were discussed and it was agreed to continue them:


7. Reference correlations for the viscosity and thermal conductivity of fluids over extended temperature and pressure ranges.

M.J. Assael (Greece), M.L. Huber, R.A. Perkins (USA), J.M.N.A Fareleira (Portugal).


      Project continues.


8. Properties of n-alkanes (higher than n-dodecane)


J.M.N.A Fareleira (Leader), F.J.P. Caetano (Portugal), M.J. Assael (Greece), M.L. Huber (USA), E. May (Australia). A.P. Fröba, K. Meier, S.E. Quiñones-Cisneros, B. Rathke (Germany), J. Fernandez (Spain). 


Project continues as part of project 9.


9. Thermal conductivity and enthalpy of fusion of substances adequate to be used as practical PCM


L. Fedele (Leader), S. Bobbo (Italy), M.J. Assael (Greece), W.A. Wakeham (U.K.), M.L. Huber, R. Perkins (USA), A.P. Fröba, T.M. Koller, K. Meier, B. Rathke, S.E. Quiñones-Cisneros (Germany), J.M.N.A. Fareleira, F.J.P. Caetano (Portugal), J. Fernandez (Spain), E. May (Australia).


Project continues.


10.   Further understanding of the operation of the torsional crystal viscometer

K. Meier (Germany), F.J.V. Santos (Portugal), A. Laesecke (USA), W.A. Wakeham (UK)


Project continues.





11. Special Issuee or issues of the International Journal of Thermophysics provisionally  titled “Recommended Techniques and Instruments for the Measurements of the Transport Properties of Fluids and Solids for Research and Industry”

W.A. Wakeham (UK), M.J. Assael (Greece), and others to be identified.

Project start 2022


12.   Transport of Hydrogen in Solids and Liquids

J.M.P. Trusler (UK), T.M. Koller, M.H. Rausch, A.P. Fröba, B. Rathke (Germany)


Project starts TBD.





Suggestions were sought from members (by email to the Secretary) of topics that might be covered in future invited lectures. The intent would be to expose issues to the group where they may be able to formulate a useful project.

Also, presentations of unresolved problems, such as that covered in the talk by the Chairman, were also encouraged.





Members were reminded that if they wish to have the endorsement of IATP for their work they should submit it to the Secretary in the first instance to arrange a rapid review. Referees who have agreed to participate in the review process in addition to the Executive Member are A. Fröba, J.M. Trusler, M.L. Huber and E. May.






Prof. M.J. Assael reminded everyone that all information about IATP activities, as well as the current list of members, can always be found at

https://ltpep.com/   -> I.A.T.P.

It was also decided that members who had not attended for some time, and where there was evidence that they would probably not have a continuing connection, would be removed form the list.


The following new members was approved:

-         Dr Gabriela Guevara-Carrion

-         Dr Carsten Wedler

-         Prof Matthias H. Buschmann






5.1. 21st IATP Meeting, 2023

The 21st IATP Meeting will take place in Venice, Italy, on the weekend prior to the 23rd ECTP (September 10-13, 2023). Details will be announced in due course. Prof. Alberto Muscio will be asked to be, or appoint, a local host.



5.2. 22nd IATP Meeting, 2024

The 22nd IATP Meeting will take place in Boulder. Colorado, USA, on Sunday prior to the 22st STP (June ??-??, 2021). Details will be announced in due course. Dr Richard Perkins or Dr Marcia Huber will be asked to be, or appoint, a local host.



5.3. 23rd IATP Meeting, 2025

The location for the 23rd IATP Meeting in 2025, is open for discussions. There is an offer to hold the meeting in Bremen, Germany, hosted by B. Rathke.




List of people that attended the meeting:


1.      Professor Sir William A. Wakeham (Chairman)

2.      Professor Marc J. Assael (Secretary)


3.      Mr Francisco Bioucas

4.      Professor Matthias Buschmann

5.      Dr Fernando Caetano

6.      Professor Carlos A. Nieto de Castro

7.      Mr Tobias Dietl

8.      Professor Joao M.N.A. Fareleira

9.      Dr Laura Fedele

10.   Dr Gabriela Guevara-Carrion

11.   Dr Robert Hellmann

12.   Mr Rouven Kanitz

13.   Mr Tobias Klein

14.   Dr Thomas Manfred Koller

15.   Professor Hans-Joachim Kretzschmar

16.   Professor Maria José V. Lourenço

17.   Professor Karsten Meier

18.   Professor Sergio E. Quiñones-Cisneros

19.   Dr Bernd Rathke 

20.   Dr Fernando V. Santos

21.   Dr Kurt Schmidt

22.   Ms Carolina Sequeira

23.   Professor J.P.Martin Trusler

24.   Ms Danai Velliadou

25.   Prof. Jadran Vrabec

26.   Dr Carsten Wedler

27.   Dr Xiaoxian Yang


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