Author(s)

S. Lalot

Abstract

Internal shape factor of straight wires sheathed electrical heating elements S. Lalot METIER, EIPC, Campus de la Malassise, BP 39, F-62967 Longuenesse Cedex, France Abstract This paper focuses on the study of the internal shape factor of sheathed electrical heating elements. In the first of the study, the geometries are presented and three dimensionless parameters are introduced. Then examples of temperature fields are given. The analysis of finite elements simulations leads to the proposition of an analytical expression of the dimensionless internal shape factor. The use of shape factors avoid confidentiality problems. During this analysis a forth dimensionless shape factor is introduced. Taking advantage of the simulations, a non uniformity factor is proposed and it is shown that this non uniformity is in all cases inferior to 16%, and in most cases inferior to 2%. In the second part of the study, considering that experimental results have led to the determination of the thermal con

Keywords