CONDUCTIVE LENGTH IN HEAT-EXCHANGE PROBLEMS OF SHELLS AND TRUSS CONSTRUCTIONS

Analysis of the conductance influence on the temperature regimes of thermally thin shells and truss constructions is carried out. For the spacial limit of the conductance influence the conductive length is introduced. For the evaluation of the conductive influence the criterion presented by the ratio of the characteristic dimension of the shell to the conductive length is proposed. The conductance can be neglected when this criterion is much larger than unity. When this relation is not fulfilled the conductance contribution is considerable. The evaluation of this criterion on the stage of the problem formulation allow determination of the need of the conductance in the heat transfer models. As an example of the application of the introduced criterion the development of the heat transfer computational models for airship shells. radio telescopes shells and truss constructions could be mentioned.