ホーム 書籍 電子書籍 ジャーナル 参考文献と会報 著者、編集者、レビュー者 A-Z商品インデックス 各受賞
Transport Phenomena in Thermal Engineering. Volume 2

ISBN 印刷:
1-56700-015-0

THE USE OF TEMPERATURE TRANSIENTS TO CALCULATE THE THERMAL DIFFUSIVITY IN POWDERS

Joe Deans
Department of Mechanical Engineering, University of Auckland, Auckland, New Zealand

J. Morrison
Department of Mechanical Engineering, University of Auckland, New Zealand

M. Allen
Department of Mechanical Engineering, University of Auckland, NEW ZEALAND

要約

This paper describes the development of a quick and simple method which can be used to measure the thermal diffusivity of fine powders. The method is based on measuring and analysing the phase lag which evolves in a cylindrical sample of powder subjected to an oscillating temperature wave originating at its axis. The variation of this phase lag with frequency has been analysed using both an analytical solution and a finite difference model. The analytical solution is the quicker method but the finite difference method is considered to be the more accurate. There is, however good agreement in the values found from both solutions. These solutions were applied to the results obtained from tests on three powders and their apparent Thermal Diffusivities are close to those predicted using other methods. As a comparison a test was performed and analysed with the rig filled with paraffin wax and the value obtained is close to that published in the literature.