2016/02/12 by Bahram Rajabifar, Rajabifar, Bahram, Hamid Reza Seyf +5
Engineering · #Phase Change Materials Research #Heat Transfer and Optimization #Nanofluid Flow and Heat Transfer
paper · pdf · doi:10.48550/arxiv.1602.04070
In this paper, a 3D conjugated heat transfer model for Nano-Encapsulated\nPhase Change Materials (NEPCMs) cooled Micro Pin Fin Heat Sink (MPFHS) is\npresented. The governing equations of flow and heat transfer are solved using a\nfinite volume method based on collocated grid and the results are validated\nwith the available data reported in the literature. The effect of nanoparticles\nvolume fraction (C = 0.1, 0.2, 0.3), inlet velocity (Vin = 0.015, 0.030, 0.045\nm/s), and bottom wall temperature (Twall = 299.15, 303.15, 315.15, 350.15 K)\nare studied on Nusselt and Euler numbers as well as temperature contours in the\nsystem. The results indicate that significant heat transfer enhancement is\nachieved when using NEPCM slurry as an advanced coolant. The maximum Nusselt\nnumber when NEPCM slurry (C = 0.3) with Vin = 0.015, 0.030, 0.045 (m/s) is\nemployed, are 2.27, 1.81, 1.56 times higher than the ones with base fluid,\nrespectively. However, with increasing bottom wall temperature, the Nusselt\nnumber first increases then decreases. The former is due to higher heat\ntransfer capability of coolant at temperatures over the melting range of PCM\nparticles due to partial melting of nanoparticles in this range. While, the\nlatter phenomena is due to the lower capability of NEPCM particles and\nconsequently coolant in absorbing heat at coolant temperatures higher than the\ntemperature correspond to fully melted NEPCM. It was observed that NEPCM slurry\nhas a drastic effect on Euler number, and with increasing volume fraction and\ndecreasing inlet velocity, the Euler number increases accordingly.\n