Abstract
A double-pipe heat exchange model is proposed to describe the axial heat-transfer rate and to predict the effective thermal diffusivity of oscillating fluid in a thin tube (the so-called dream pipe). Since the profile of bulk temperature in the axial direction is very similar to that of the counter flow in a double-pipe heat exchanger, we can obtain the heat-transfer rate by using the expression of log-mean temperature difference and thermal resistance network for the overall heat-transfer coefficient. The experimental results utilizing three kinds of tube materials ; Pyrex glass, Teflon and aluminum, are also presented to reveal the contribution of the tube wall to axial heat transfer. Using the result of numerical analysis of the unsteady-state temperature profile in the tube, the local Nusselt number is calculated for some oscillating frequencies and compared with the expression given in terms of boundary layer thickness. The prediction of the effective thermal diffusivity based on this model is confirmed by the previous results as well as by these experimental ones.
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