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Keywords: condensation
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Proceedings Papers

Proc. ASME. MNHMT2019, ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer, V001T10A003, July 8–10, 2019
Publisher: American Society of Mechanical Engineers
Paper No: MNHMT2019-3950
... Abstract This study numerically investigated the condensation heat transfer and flow characteristics of refrigerants R134a in rectangular minichannels. Three-dimensional simulations were carried out at different mass flux values, vapor qualities and gravity conditions through using the VOF...
Proceedings Papers

Proc. ASME. MNHMT2019, ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer, V001T04A002, July 8–10, 2019
Publisher: American Society of Mechanical Engineers
Paper No: MNHMT2019-3920
.... This paper investigates NH 3 condensation in a PHE with a hydraulic diameter of 2.99 mm. The large surface tension of NH 3 enhances the micro-channel characteristics. The heat transfer coefficients (HTCs) are compared with homogeneous and separated models, respectively. Both models have been previously...
Proceedings Papers

Proc. ASME. MNHMT2019, ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer, V001T04A004, July 8–10, 2019
Publisher: American Society of Mechanical Engineers
Paper No: MNHMT2019-4038
... Abstract Results are presented here from an experimental investigation on tube side condensation characteristics that took place in four tested tubes — 1EHT-1, 1EHT-2, 4LB and a smooth tube. The equivalent outer diameter of the tubes was 9.52 mm and the inner diameter was 8.32 mm. Condensation...
Proceedings Papers

Proc. ASME. MNHMT2009, ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer, Volume 2, 103-110, December 18–21, 2009
Publisher: American Society of Mechanical Engineers
Paper No: MNHMT2009-18064
... Experiment was conducted to study steam condensation in horizontal microchannel etched on silicon wafer and bonded by a Pyrex glass plate from the top. The trapezoidal microchannel had a top width of 7943.11μm and depth of 81.77μm with hydraulic diameter of 161.49μm. The experiments were...
Proceedings Papers

Proc. ASME. MNHMT2009, ASME 2009 Second International Conference on Micro/Nanoscale Heat and Mass Transfer, Volume 2, 139-145, December 18–21, 2009
Publisher: American Society of Mechanical Engineers
Paper No: MNHMT2009-18245
... A steady-state Volume of Fluid (VOF) simulation of condensation of R134a inside a 1 mm i.d. minichannel is proposed. The minichannel is horizontally oriented and both the effects of gravity and surface tension are taken into account. A uniform interface temperature, as well as a uniform wall...
Proceedings Papers

Proc. ASME. MNHT2008, ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer, Parts A and B, 1021-1022, June 6–9, 2008
Publisher: American Society of Mechanical Engineers
Paper No: MNHT2008-52355
... with hexadeconethiol coating, continuous dropwise condensation was demonstrated for the first time on engineered superhydrophobic surfaces. Keywords: Superhydrophobic, Two-Tier Texture, Evaporation, Condensation, Biomimetics INTRODUCTION Superhydrophobic surfaces with large contact angle (>150º) and small hysteresis...
Proceedings Papers

Proc. ASME. MNHT2008, ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer, Parts A and B, 739-746, June 6–9, 2008
Publisher: American Society of Mechanical Engineers
Paper No: MNHT2008-52201
... that the device achieves very high ransfer rate of hundreds times larger than that of the g heat exchanger. Furthermore, visualization ment with single glass pipe is conducted to clarify the condensation behavior in the microchannel. In the ment, the microchannel of Pyrex glass is surrounded by bcooling water...
Proceedings Papers

Proc. ASME. MNHT2008, ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer, Parts A and B, 1407-1415, June 6–9, 2008
Publisher: American Society of Mechanical Engineers
Paper No: MNHT2008-52387
.... For condensation in a microchannel, ar flow, injection flow, slug/bubbly flow exist ss flux, condensation heat flux, and the location el. The occurrence of the injection flow is owing of the liquid/vapor interface because the surface ant in microchannels. The location, at which the curs, depends on the mass flux...
Proceedings Papers

Proc. ASME. MNHT2008, ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer, Parts A and B, 801-807, June 6–9, 2008
Publisher: American Society of Mechanical Engineers
Paper No: MNHT2008-52315
... 23 06 2009 Multichannel effect is an important issue in micro condensers. In the present paper, we fabricated a silicon chip, consisting of three rectangular microchannels, with each width of 800 microns but depth down to 30 microns. Saturated vapor of water enters the entrance...