measurement of physical quantitics

Article

Dependence of thermal diffusion effects in liquids on the physical properties of the dispersing phase

F. S. Gaeta 1, A. Di Chiara 2

1International Institute of Genetics and Biophysics, C.N.R., Naples, Italy 2International Institute of Genetics and Biophysics, C.N.R., and Faculty of Engineering of the University of Naples, Naples, Italy

Abstract

1. A generalization of the radiation-pressure theory of thermal diffusion in liquids explains the genesis of the forces acting in a condensed phase when heat flows through it. The analytical expressions obtained make it possible to connect such forces originated by the radiation pressure of thermal waves with the transport of matter taking place in solutions or suspensions of particles and also with the ultimate result of this transport, that is, the steady-state concentrations of the dispersed phase in the hot and in the cold regions of the nonisothermal solution. The form in which the theoretical results are laid down lends itself to direct and unambiguous experimental verification. The confrontation with a few data found in the literature lends support to the theory. click here