Journal of Physical Studies 13(3), Article 3601 [4 pages] (2009)
DOI: https://doi.org/10.30970/jps.13.3601

THERMAL EXPANSION EFFECT ON HEAT TRANSFER PROCESSES IN ORIENTATIONALLY-ORDERED MOLECULAR CRYSTALS

O. I. Pursky^{1}, V. A. Konstantinov^{2}
^{1}Taras Shevchenko Kyiv National University, Department of Physics,
2, Academician Glushkov Ave., Kyiv, UA--03680, Ukraine
^{2}B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Science of Ukraine,
47, Lenin Ave., Kharkiv, UA--61103, Ukraine

The influence of the thermal expansion on heat transfer processes has been considered in orientationally ordered molecular crystals. A modified method of reduced coordinates was used to separate phonon-phonon and phonon-rotational contributions to the total thermal resistance in isobaric and isochoric cases. It was shown that a discrepancy between temperature dependences of the isobaric ($Λ_{\rm p}$) and isochoric ($Λ_{\rm v}$) thermal conductivity is mainly governed by the intensity of a phonon-phonon interaction because the phonon-rotational component of thermal resistance weakly depends on thermal expansion.

PACS number(s): 66.70.+f; 63.20.Ls