ARTICLE:

• EXPERIMENTAL INVESTIGATION OF UNSTEADY TURBULENT FORCED CONVECTION IN A RECTANGULAR DUCT WITH ARRAYS OF BLOCK-LIKE ELECTRONIC COMPONENTS  download article

Nedim Sozbir
Department of Mechanical Engineering, Sakarya University, Sakarya, Turkey

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

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

Ibrahim Sarac
Department of Mechanical Engineering, Kocaeli University, Kocaeli, Turkey

Ismail Calli
Department of Mechanical Engineering, Sakarya University, Sakarya, TURKIYE

ABSTRACT

This work focuses on an experimental study of unsteady turbulent forced convection in a rectangular duct with arrays of block-like electronic components, subjected to a periodically varying inlet temperature with hydrodynamically developed and thermally developing air flow. The modules are positioned both inlined and staggered arrangements to simulate the electric heating and cooling inside the computer. The study is conducted in turbulent forced flows with approach Reynolds number ranging from 11240 to 21580 with geometric parameters fixed at H/2b=0.1875, S/2b=4.26 while the inlet heat input frequency varied from 0.02 Hz to 0.24 Hz. The experiments are carried out in the thermal entrance region with the fully developed velocity profile. The temperature variation at the several locations along the duct was measured and recorded. The temperature amplitude decayed exponentially along the duct. The decayed indexes are obtained from the experimental investigation under different conditions are presented in tabular and graphical forms.

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