This paper presents an experimental investigation of forced convection heat transfer in two heat sinks for electronic system cooling and investigated the comparisons of the thermal behavior of the mini-and microchannel heat exchangers. The hydraulic dimension of one of the heat sinks is 2 mm while that of the other is 180 m. Deionized water was used as the working fluid for studies conducted in both the heat exchangers. The effect of heat flux and volumetric flow rate (in laminar flow regime) on temperature and heat transfer coefficient is studied. Irrespective of the average heat transfer coefficient and the total thermal resistance, advantages and limitations of each device are analyzed and discussed in the light of experimental results. Furthermore, the results obtained from the experiments were in good agreement with those obtained from the design theory analyses.
In this study, the contributions of Au, Cu and Ag nanoparticles for enhancing the heat transfer in the rectangular microchannel heat sink with vortex generators are compared in this work. A two dimensional numerical method is used to simulate the forced convection of water-based suspensions of different nanoparticles in the microchannel heat sink submitted to a constant and uniform temperature (T= 303K) at the wall . The gouverning equations are solved numerically using code FLUENT based on CFD method. Comparisons with previously published work on the basis of special cases are performed and found to be in excellent agreement. The effect of volume fraction, Reynolds number and type of nanoparticles on the fluid flow and heat transfer processes within the microchannel are analyzed. In addition, an analysis of isothermals and streamlines based on the different nanofluid are developed and presented. It is shown that the different nanoparticles within different thermal conductivity values have substantial effects on the results. Finally, the local and average Nusselt number for various Reynolds numbers and volume fractions are presented.
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