Premium
Interfacial effects for transient heat conduction in the non‐continuum regime
Author(s) -
Picot J. J. C.
Publication year - 1969
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450470103
Subject(s) - thermal conduction , jump , thermal conductivity , mechanics , temperature jump , transient (computer programming) , materials science , thermal , thermodynamics , conductivity , condensed matter physics , physics , composite material , quantum mechanics , computer science , operating system
Experimental results are given which show that for non‐continuum conditions for heat conduction between a solid surface and a gas, there is a surface zone (of probably four or five mean free paths in thickness) where the “effective” thermal conductivity gradually changes from a value governed by gas — solid wall interactions to the normal continuum value in the bulk phase. In the temperature‐jump range, the effect of this surface zone in steady‐state situations can be adequately expressed by a temperature‐jump distance, but this approach is inadequate for transient state situations. In the transient state, a theory is required which allows for the gradually changing effective thermal conductivity in the surface zone.