Library Subscription: Guest

ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Estimation of the Heat Transfered to a Fluid in a Minichannel by an Inverse Technique

Get access (open in a dialog) DOI: 10.1615/IHTC15.inv.009190
pages 4549-4563

Abstract

This paper deals with reconstruction of the temperature and normal heat flux transient profiles inside a flat mini-channel from external temperature measurement over its external heated face. It uses an analytical model which is written using Laplace and Fourier integral transforms whose output is verified through comparison with a finite elements code. Estimation of the Fourier harmonics of the external experimental temperature profile at different times is regularized through Truncated Singular Value Decomposition. A similar technique is used in time for a regularized deconvolution of each harmonics of this temperature. This inverse technique has been implemented on an experimental mini-fluidic bench with electrical heating and temperature measurement by thermocouples and infrared thermography, for a low Peclet number of the flow. The presented results show that the heat source can be recovered, as well as the internal normal heat flux and temperature distributions, including the bulk temperature of the liquid flow at any time. Possible applications concern the transient characterization and heat management of thermal systems, such as flat plate solar collectors or heat exchangers with low to medium temperature level, for fatal heat recovery.