The present work describes an experimental study and CFD modeling of fluid flow and heat transfer characteristics in a heat sink with several asymmetrical heated mini-channels. The data from the experimental research were the basis for numerical calculations. During experiments, the temperature measurement of the outer heater surface was performed by infrared thermography to verify the results of numerical calculations performed in Simcenter STAR-CCM+ software. The main objective was to determine the values of the parameters tested to evaluate the intensity of the heat transfer processes. In the numerical simulations, important variables, mainly the working fluid, heater material, the spatial orientation of the test section, and the number of mini-channels, were assumed. The results of the numerical computations were discussed. Due to simulations, it was possible to indicate which parameters tested in terms of heat transfer turned out to be the most effective. Furthermore, a mesh dependency analysis based on the grid convergence index (GCI) was performed. The residuals, as good indicators of convergence, achieved low values. Generally, the data presented showed satisfactory convergence of the results achieved as a result of the computational procedure.
The article describes the experimental investigation of pool boiling heat transfer on minichannels with filling in the form of porous structure (copper foam). The results were compared with the data for a smooth surface and the minichannels without additional fillings. Tests were carried out for the boiling liquid Novec-649. Surfaces partially filled with porous structure were formed by inserting pieces of copper foam into the minichannels of 5 mm in depth and 1 mm width. Minichannels completely filled with copper foam formed the surface of MCC-F. The measurements were made with an increase in heat flux. The heat transfer coefficient obtained was four times higher than for the smooth surface. Additional foam fillings increased the heat transfer coefficient and reduced superheat for heat fluxes less than 100 kW/m2. Visualisation was made using a high-speed camera which allowed to determine the diameters of the growing bubble.
The work focused on the investigations and comparison of pool boiling heat transfer on the specimens with in 5 mm deep and 1 mm wide parallel mini-channels to the specimens with additional porous material (copper foam or mesh) between the fins. The experiments were carried out with boiling FC-72 at atmospheric pressure. Many works show that enhanced surfaces with open minichannels improve heat transfer performance substantially. The use of additional porous material led to the highest heat transfer coefficients in the range of 100 to 230 kW/m2. The coefficients obtained were 15% higher and the superheat was 15% lower compared to the plain smooth minichannel without porous material.
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