The Comparisons on Distribution Between Perpendicular Flow and Parallel Flow of Microchannel Evaporators by the Separated Manifolds

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Le, Congkhanh; Dang, Thanhtrung; Le, Batan; Giang, Kiencuong


Mechanics, Materials Science & Engineering, 18 (1), 2018, ISSN: 2412-5954.

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Authors: Congkhanh Le, Thanhtrung Dang, Batan Le, Kiencuong Giang

ABSTRACT. In this paper, comparisons on distribution between perpendicular flow and parallel flow to the microchannels in separated manifolds of microchannel evaporators were investigated by the numerical simulation and the experiment. For the comparisons, two kinds of separated manifolds were designed: the perpendicular flow separated manifold and the parallel flow one. The manifolds were made of plastic and the microchannel heat sinks were made of Aluminum. The length of each microchannel is 120 mm, the depth is 0.5 mm, and the width is 0.3 mm. In this study, the results were obtained with the inlet temperature Tin = 40oC, heat power Psource = 130 W, mass flow rate min = 0.3 g/s, ambient temperature Tamb = 30°C. The results showed that the parallel flow separated manifold always has better than the perpendicular flow one. In addition, it was showed that the nucleation site and full evaporation in the parallel flow case happen sooner than the perpendicular one in both simulations and experiments which giving the better heat transfer efficiency.

Keywords: perpendicular flow, parallel flow, microchannel, heat sink, manifold, evaporation

DOI 10.2412/mmse.26.90.775


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