Determination of annular condensation heat transfer coefficient of steam in microchannels with trapezoidal cross sections |
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| Authors: | Xiaojun Quan Lining Dong Ping Cheng |
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| Affiliation: | 1. BMW Group, 80788 Munich, Germany;2. AKKA GmbH, 80992 Munich, Germany;1. Department of Mechanical Engineering, Benha Faculty of Engineering, Benha University, Benha, 13511 Qalyubia, Egypt;2. Solar Energy Department, National Research Centre, El-Behooth Street, Dokki, 12622 Giza, Egypt;1. Life Expert Centre, Schipvaartstraat 4, 3000 Leuven, Belgium;2. Unit Reproductive Medicine, Heilig Hart Hospital, Naamsestraat 105, 3000 Leuven, Belgium;3. Department of Gynecological Oncology, Evagelistria Medical Center, Nicosia, Cyprus;4. Department Histology & Cytology, AML, Antwerp, Belgium |
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| Abstract: | Experiments have been carried out to determine annular condensation heat transfer coefficient of steam in two silicon microchannels having trapezoidal cross sections with the same aspect ratio of 3.15 at 54 < G < 559 kg/m2 s under 3-side cooling conditions. A semi-analytical method, based on turbulent flow boundary layer theory of liquid film with correlations of pressure drop and void fraction valid for microchannels, is used to derive the annular local condensation heat transfer coefficients. The predicted values based on the semi-analytical model are found within ±20% of 423 data points. It is shown that the annular condensation heat transfer coefficient in a microchannel increases with mass flux and quality and decreases with the hydraulic diameter. |
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