INTERMOLECULAR FORCES FROM DIFFUSION AND THERMAL DIFFUSION MEASUREMENTS
Experimental values of the diffusion coefficient and the thermal diffusion factor for the systems He-Ar, He-CO/sub 2/, and H/sub 2/-CO/sub 2/, over a temperature range of about -78 deg to 325 deg C, were analyzed for the purpose of testing the Lennard-Jones (12 - 6) and the exp-6 intermolecular potentials, as well as the combination rules usually used in conjunction with these potentials. The exp-6 potential gave excellent results for He-Ar, but the 12 - 6 potential wss not satisfactory. This system afforded no opportunity to choose between the various combination rules. The 12-6 potential worked fairly well for He-CO/sub 2/ and H/sub 2/CO/sub 2/. On the whole, the combination rules were surprisingly good. The importance of considering the higher theoretical approximations for the thermal diffusion factor was emphasized. An expression interrelating the transport properties and independent of any particular intermolecular potential was proposed, which could be used to test how well a mixture conformed to the basic assumptions of the Chapman-Enskog theory or to indicate the consistency of the experimental measurements. (auth)
- Research Organization:
- Univ. of Maryland, College Park
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-14-022216
- OSTI ID:
- 4160693
- Journal Information:
- Physics of Fluids (U.S.), Journal Name: Physics of Fluids (U.S.) Vol. Vol: 3; ISSN PFLDA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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