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|New measurments of heat transfer during condensation in microchannels
4th Micro and Nano Flows Conference (MNF2014)
|Brunel University London
|4th Micro and Nano Flows Conference, University College London, UK, 7-10 September 2014, Editors CS König, TG Karayiannis and S. Balabani
|A recent theory of condensation in microchannels employs only the Nusselt approximations and has no empirical input. The predictions are in good agreement with experimental data for fluids with relatively low surface tension, namely R134a and FC72. The theory demonstrates that surface tension plays a vital role for non-circular channels by causing condensate to be driven towards the corners leaving a thin film with consequently high heat-transfer coefficient along the sides. The paper reports provisional results of a new research programme aimed at providing very accurate data for fluids covering a wide range of properties, notably surface tension. New experimental results are reported here for steam where the surface tension is much higher than the fluids used hitherto. Preliminary results show the same trends as found with lower surface tension fluids but heat-transfer coefficients for steam are higher by factors of ten or more.
|This paper was presented at the 4th Micro and Nano Flows Conference (MNF2014), which was held at University College, London, UK. The conference was organised by Brunel University and supported by the Italian Union of Thermofluiddynamics, IPEM, the Process Intensification Network, the Institution of Mechanical Engineers, the Heat Transfer Society, HEXAG - the Heat Exchange Action Group, and the Energy Institute, ASME Press, LCN London Centre for Nanotechnology, UCL University College London, UCL Engineering, the International NanoScience Community, www.nanopaprika.eu.
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|Brunel Institute for Bioengineering (BIB)
The Brunel Collection
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