Suscripción a Biblioteca: Guest
Página principal de la Biblioteca Digital de ICHMT Año actual Archivos Comité Ejecutivo Centro Internacional de Transferencia de Calor y Masa


DOI: 10.1615/ICHMT.2008.CHT.2150
5 pages

L. C. Akalanne
Department of Mechanical Engineering, University of Bath, Bath, BA2 7 AY

S. A. MacGregor
Department of Mechanical Engineering, University of Bath, Bath, BA2 7 AY


The purpose of this investigation is to determine if distorting the shape of a cuboid, could affect reattachment lengths due to the promotion of greater instability to the streamwise flow. Electronic components on a printed circuit board are often represented by simple cubes in experimental investigations of heat transfer and fluid dynamics, in this investigation the effect distortion is considered using computational fluid dynamics. However electronic components come in many shapes and forms, thus it is important to understand how shape may influence parameters such as reattachment as this could potentially affect cooling of components immediately downstream the component under consideration.
The investigation considered three un-distorted cuboids and four different distorted cuboid topologies subjected to streamwise flow in the Reynolds number range 17×103 < ReD < 67×103. The undistorted cuboids investigated had a width to height ratio of W/H = 3, 3.5 and 4. The distorted cuboid topologies considered were, parallelogram, isosceles trapezium, inverted parallelogram and inverted isosceles trapezium. The dimensions were selected to ensure that the various obstacles provided similar obstruction to the streamwise flow with respect to obstacle height and depth.
It has been observed that the reattachment length for distorted cuboids (within the range of distortion studied) has a strong relationship with the obstacle’s shadow width and it is postulated that this is due to the promotion of greater momentum transfer downstream of the obstacle.

ICHMT Digital Library

Bow shocks on a jet-like solid body shape. Thermal Sciences 2004, 2004. Pulsed, supersonic fuel jets - their characteristics and potential for improved diesel engine injection. PULSED, SUPERSONIC FUEL JETS - THEIR CHARACTERISTICS AND POTENTIAL FOR IMPROVED DIESEL ENGINE INJECTION
View of engine compartment components (left). Plots of temperature distributions in centreplane, forward of engine (right). CHT-04 - Advances in Computational Heat Transfer III, 2004. Devel... DEVELOPMENT AND CURRENT STATUS OF INDUSTRIAL THERMOFLUIDS CFD ANALYSIS
Pratt & Whitney's F-135 Joint Strike Fighter Engine under test in Florida is a 3600F class jet engine. TURBINE-09, 2009. Turbine airfoil leading edge stagnation aerodynamics and heat transfe... TURBINE AIRFOIL LEADING EDGE STAGNATION AERODYNAMICS AND HEAT TRANSFER - A REVIEW
Refractive index reconstructed field. (a) Second iteration. (b) Fourth iteration. Radiative Transfer - VI, 2010. Theoretical development for refractive index reconstruction from a radiative ... THEORETICAL DEVELOPMENT FOR REFRACTIVE INDEX RECONSTRUCTION FROM A RADIATIVE TRANSFER EQUATION-BASED ALGORITHM
Two inclusion test, four collimated sources. Radiative Transfer - VI, 2010. New developments in frequency domain optical tomography. Part II. Application with a L-BFGS associated to an inexa... NEW DEVELOPMENTS IN FREQUENCY DOMAIN OPTICAL TOMOGRAPHY. PART II. APPLICATION WITH A L-BFGS ASSOCIATED TO AN INEXACT LINE SEARCH