1. Department of Mechanical Engineering, Keio University, Yokohama 223, Japan
2. Thermophysics Division, National Institute of Standards and Technology, Gaithersburg,
MD 20899, U.S.A.
3. Department of Mechanical Engineering, University of British Columbia, Vancouver, BC,
V6T 1W5, Canada
4. Institut f ür Thermodynamik, Technische Universitát München, D‐8000, München,
Germany
5. Institut f ür Thermo‐ und, Fluiddynamik, Ruhr‐Universität Bochum, D‐4630, Bochum,
Germany