Title

RETRIEVAL OF MULTIDIMENSIONAL HEAT TRANSFER COEFFICIENT DISTRIBUTIONS USING AN INVERSE BEM-BASED REGULARIZED ALGORITHM: Numerical and experimental results

Abstract

Surface maps of heat transfer coefficients (h) are often determined by transient liquid crystal or other similar transient experimental techniques. This involves (1) conducting an experiment with an impulsively imposed convective boundary condition on an initially isothermal test object, (2) measuring the resulting timedependent surface temperature distributions, and (3) solving the onedimensional transient heat conduction equation for different points on the convective surface. There are many practical cases where this approach fails to adequately model the temperature field and, consequently, leads to erroneous h values. In this paper, we present an inverse boundary element method(BEM)-based approach for the retrieval of spatially varying h distributions from surface temperature measurements. In this method, an efficient numerical algorithm requiring only a surface mesh is used to solve the conduction problem. At each time level, a regularized functional is minimized to estimate the time-dependent heat flux and simultaneously minimize the effect of experimental measurement uncertainties in surface temperatme values on the calculated heat flux. Newton's cooling law is then invoked to compute h. Results are presented from several numerical simulations and from a laboratory experiment. The method is applicable to unsteady as well as to steady-state convective systems.

Publication Date

1-1-1999

Publication Title

ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)

Volume

1999-O

Number of Pages

235-244

Document Type

Article; Proceedings Paper

Personal Identifier

scopus

DOI Link

https://doi.org/10.1115/IMECE1999-0990

Socpus ID

85122691198 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85122691198

This document is currently not available here.

Share

COinS