2023 Venice

  21th IATP Meeting, September 10th 2023 




             The meeting was opened by the Chairman, Prof. Sir William Wakeham, who welcomed all present and thanked Prof. Alberto Muscio and Dr Laura Fedele, 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   Accurate Determination of Viscosity and Interfacial Tension by Surface Light Scattering for non-Transparent Fluids

          J. Knorr, J. Cui, Th.M. Koller, and A.P. Fröba (Germany)


2.2   Thermophysical Properties Engineering based on Electrothermal Sensors

          Y. Taguchi (Japan)


2.3   Low temperature energy storage PCM systems – phase equilibrium studies

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


2.4   Thermophysical Properties of Oxygen Gas from First Principles 

          R. Hellmann (Germany)


2.5   Simultaneous Storage of CO2 and NG

          S. Quiñones-Cisneros, S. Pollak (Germany)


2.6    The Thermal Conductivity of Asymmetric Mixtures

          A. Rowane (USA)


2.7   Correlations for the Density, Viscosity and Thermal Conductivity of Liquid Titanium, Zirconium, Hafnium, Vanadium, Niobium, Tantalum, Chromium, Moly-bdenum, and Tungsten

           E. Ntonti, S. Sotiriadou, M.J. Assael (Greece), B. Wilthan, M.L. Huber (USA)


2.8    Problems Concerning the Determination of the Thermal Conductivity of Aerogels and Solutions

           H.P. Ebert (Germany)


2.9    An Instability Caused by the Interplay of Soret Effect and Cross–diffusion in Ternary Mixture

           V. Shevtsova, B.Seta. I. Ryzhkov, A. Errate, M.M. Bou-Ali (Spain)


2.10   Accuracy Limits for the Measurement of Thermodiffusion and Soret Coefficients of Ternary Mixtures

          W. Köhler (Germany)


2.11   Viscosity of Synthetic e-fuel Candidates: Polyoxy-methylene Dimethyl Ethers (OMEs)

           C. Wedler and J P.M. Trusler (UK)


2.12   Transport properties at Thermodynamics Research Center

           V. Diky (USA)


2.13  On the Density, Viscosity and Thermal Conductivity of [C12MIM][(CF3SO2)2N] and their IoNanofluids with Graphene

           A. Lamas, X. Paredes, Â.F. Santos, F.J.V. Santos, M.J.V. Lourenço, C.A. Nieto de Castro, T. Graber (Portugal) 


2.14   The Thermal Needle Probe. Can it be Saved?    

           W.A. Wakeham (UK), M.J. Assael (Greece)


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


 a a)  Measurements & Instruments:

-     J. Knorr discussed the use of the Surface Light Scattering technique at small wave vectors, in order to investigate the viscosity and surface tension of high-viscosity samples. M.C.M. Sequeira presented results of the DSC heating curves of diethyl, and dibutyl adipate and selected binary mixtures, confirmed by hot-stage microscopy and the eutectic behaviour of this system at low temperatures. 

-     A single wire THW instrument was described by A. Rowane, to measure the thermal conductivity of fuel+N2 water mixtures.

-     Various interesting applications of thermophysics at Keio University, were presented by Y. Taguchi, in areas such as: a) measurement of the viscosity of tear fluid, b) thermal control of spacecraft, c) 3D bio-printer using fs-pulsed laser, d) laser-induced dielectrophoretic manipulation for sensing diffusion coefficients, e) diffusion coefficients of liposomes, f) micro-optical diffusion sensors, g) a low-voltage electrothermal MEMS mirror, h) a Kirigami-inspired electrothermal actuator, and i) the 4D printing of electrothermal actuator.

-    H.P. Ebert discussed different types of aerogels, and presented the difficulties in selecting the right instrument for measuring their effective thermal conductivity.

-    W. Köhler discussed the accuracy limits for the measurement of thermodiffusion and Soret coefficients in ternary mixtures – up to 1% for binary mixtures and up to 10% for ternary mixtures.

-   J.P.M. Trusler presented density and viscosity measurements of the alternative synthetic liquid fuels, ethyl tetradecanoate, methyl decanoate, and polyoxymethylene dimethyl ethers (OME3 and OME4). 

-    C.A. Nieto de Castro showed that there is no enhancement in the thermal conductivity of the ionic liquid [C12MIM][(CF3SO2)2N], when small fractions of graphene were added.


b)   Theoretical:


-    A very interesting presentation of the absence of rigorous theory in the case of the thermal Needle-Probe instrument employed for the thermal conductivity of fluids and solids, was presented by W.A. Wakeham, as well as a possible future model that could be applied for this technique.

-    An interesting instability caused by the interplay of the Soret effect and cross–diffusion in the ternary system toluene+cyclohane+methanol, was presented by V. Shevtsova.



c)    Reference values/Correlations:


-    R. Hellmann proposed new reference correlations for the dilute-gas transport properties of oxygen gas, based solely on calculated values.

-     E. Ntonti presented and proposed new reference correlations for the density, and thermal conductivity of liquid titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, and tungsten, and showed the lack of viscosity measurements for these melts.


d)    Other:


-     S. Quiñones-Cisneros discussed an interesting and novel idea in the area of carbon dioxide storage and a gas exchange networks.

-     V. Diky presented the work being carried out on transport properties at the Thermodynamic Research Center in NIST, Boulder, Co.








No project has been concluded.





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


1. 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, F. Caetano, J.M.N.A. Fareleira (Portugal). 

     Project continues.


2. High-temperature high-pressure viscosity standards

  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), J. Fernandez (Spain), K. Schmidt (Canada), Chr. Boned (France) 

     Project continues. F. Caetano will prepare a paper summarizing all that has been done.


3. 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), V. Shevtsova (Belgium). 

Project continues.


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

C.A. Nieto de Castro, F.J.V. Santos (Portugal), W.A. Wakeham (UK) 

Project continues.


  5. 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).

W.A. Wakeham and M.J. Assael as Guest Editors have invited about 20 authors (most present in the meeting) to contribute. Deadline for submission is the end of December 2023.


  6.   Transport of Hydrogen in Solids and Liquids

J.M.P. Trusler (UK), T.M. Koller, M.H. Rausch, A.P. Fröba, B. Rathke (Germany), F. Caetano, J.M.N.A. Fareleira (Portugal) 

Project continues.




7.  Apparent Thermal Conductivity of Nanofluids


J. Fernandez (Spain, Leader), L. Fedele (Italy), C.A. Nieto de Castro (Portugal), A.P. Fröba (Germany), M.J. Assal (Greece). 







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.P. 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 Tara Fortin

-         Ms Maria Carolina Sequeira






5.1. 22nd IATP Meeting, 2024

The 22nd IATP Meeting will take place in Boulder, CO, USA, on June, Sunday 23rd, prior to the 22nd STP (June 23-28, 2024). Details will be announced in due course. R. Perkins and A. Rowane will be the local hosts.



5.2. 23rd IATP Meeting, 2025

The location for the 23rd IATP Meeting in 2025, is open for discussions. There are three offers to hold the meeting: a) in Bremen, Germany, hosted by B. Rathke, b) in Dresden, hosted by M. Buschmann, and c) in Xi’an, China, hosted by J. Wu.





List of people that attended the meeting:


1.  Professor Sir William A. Wakeham (Chairman)

2.  Professor Marc J. Assael (Secretary)


3. Dr Konstantinos Antoniadis

4. Dr Sergio Bobbo

5. Dr Fernando Caetano

6. Ms Fang Chen

7. Mr Tobias Dietl

8. Dr Vladimir Diky

9. Dr Hans-Peter Ebert

10 .Dr Laura Fedele

11. Professor Josefa Fernandez

12. Dr Tara Fortin

13. Professor Andreas P. Fröba

14. Mr Ruben Harten

15. Dr Johannes Knorr

16. Professor Werner Köhler

17. Dr Thomas Manfred Koller

18. Professor Maria José V. Lourenço

19. Mr Philipp Marienhagen

20. Professor Karsten Meier

21. Dr Sofia Mylona

22. Professor Yuji Nagasaka

23. Professor Carlos Nieto de Castro

24. Ms Eleftheria Ntonti

25. Professor Sergio E. Quiñones-Cisneros

26. Dr Bernd Rathke 

27. Dr Aaron Rowane

28. Ms Carolina Sequeira

29. Professor Valentina Shevtsova

30. Ms Sofia Sotiriadou

31. Professor Yoshihiro Taguchi

32. Mr Xyyao Tang

33. Professor J.P.Martin Trusler

34. Ms Danai Velliadou

35. Professor Velisa Vesovic

36. Dr Boros Wilthan

37. Mr Ru Wang

38. Professor Jiangtao Wu

39. Mr Tao Yang


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