Executive Summary : | Removal of waste heat via thermal management systems avoids premature component failure and improves system reliability. Passive cooling through natural convection coupled with surface radiation is a promising simple and effective technique in this regard. An improved model involving conjugate conduction, convection and radiation is proposed to enhance heat dispersal mechanism in fluid filled cooling jackets containing submerged heat generating components. The present proposal will examine the effect of installing heat sinks at specific locations in the walls of the cooling jacket where hot spots may arise. A finite volume based computational investigation will be made by solving the Navier-Stokes equations and the energy equation numerically. The associated flow pattern, temperature distribution and heat transfer rate will be obtained as a function of time for a variety geometrical and heating conditions. The onset of turbulence will be predicted by chaos theory via Ruelle-Takens-Newhouse scenario. Moreover, the predictability of the dynamical system and the dimension of the invariant attractor will be determined. The knowledge gained from the proposed study will be extremely useful in the optimal design of passively cooled thermal management systems. |