Flow boiling of dielectric fluid HFE – 7000 in a minichannel with pin fin structured surfaces

Ateş, Ayşenur and Çelik, Süleyman and Yağcı, Vedat and Çağlar Malyemez, Muhammed and Parlak, Murat and Sadaghiani, Abdolali Khalili and Koşar, Ali (2023) Flow boiling of dielectric fluid HFE – 7000 in a minichannel with pin fin structured surfaces. Applied Thermal Engineering, 223 . ISSN 1359-4311 (Print) 1873-5606 (Online)

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Flow boiling of dielectric fluids in minichannels provides promising cooling alternatives for achieving high heat flux cooling. In this regard, flow boiling experiments in minichannels with six different surface characteristics were performed using HFE – 7000 as the working fluid. Average boiling heat transfer coefficients were obtained over effective heat fluxes ranging from 50 to 1300 kW/m2 and mass fluxes from 125 to 280 kg/m2s. The effects of the presence of elliptical pin fins, presence of distribution pin fins as well as tip clearance were assessed, and different flow patterns could be identified: single – phase flow, bubbly flow, intermittent flow, and annular flow. The results indicate that elliptical pin fins significantly augmented the flow boiling performance. Moreover, the distribution pin fins in the inlet region could provide more homogenous flow distribution and results in enhanced heat transfer. Additionally, the positive effect of tip clearance could be observed for its low (<5%) values.
Item Type: Article
Uncontrolled Keywords: Distribution pin fin; Flow boiling; Heat transfer enhancement; HFE – 7000; Pin fin; Tip clearance
Divisions: Faculty of Engineering and Natural Sciences
Sabancı University Nanotechnology Research and Application Center
Depositing User: Abdolali Khalili Sadaghiani
Date Deposited: 16 Apr 2023 17:16
Last Modified: 16 Apr 2023 17:16
URI: https://research.sabanciuniv.edu/id/eprint/45378

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