ARTICLE:

• EXPERIMENTAL AND THEORETICAL ANALYSES OF UNSTEADY TURBULENT FORCED CONVECTION WITH TIMEWISE VARIATION OF INLET TEMPERATURE  download article

M. Arik
Department of Mechanical Engineering, University of Miami, Coral Gables, FL 33124 -USA

C. A. C. Santos
Universidade Federal da Paraiba, Laboratorio de Energia Solar (LES/DTM/CT/UFPB), Brazil

Sadik Kakac
Department of Mechanical Engineering, University of Miami, P.O. Box 248294 - Coral Gables, Florida - 33124-0624 - USA

ABSTRACT

Unsteady turbulent forced convection heat transfer in the thermally developing region of a paralle-plate channel with timewise varying inlet temperature is studied experimentally and theoretically. An experimental set-up was built and used in order to validate the employed mathematical modeling. For a wide range of Reynolds numbers and inlet frequencies are chosen in order to study the impact of inlet frequency on decay index. The theoretical solution of the problem consists of analytical and numerical parts. The analytical part is obtained through extending the generalized integral transform technique. The numerical part is employed after the analytical part is completed and a powerful method, Sing-Count, is used in order to solve the eigenvalue problem. Results obtained from both experimental and theoretical analyses have been presented in graphical and tabular forms. Analytical solutions are verified the experimental findings that is more close to the real world applications. Satisfactory agreement is obtained between theoretically and experimentally determined heat transfer characteristics for different axial positions along the channel.

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