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An experimental investigation of flow boiling characteristics of water in parallel microchannels : Experimentelle Untersuchung der Strömungssiedecharakteristiken von Wasser in parallelen Mikrokanälen

Microchannels are being considered in many advanced heat transfer applications including automotive and stationary fuel cells as well as electronics cooling. However there are a number of fundamental issues from the heat transfer and fluid mechanics perspectives that still remain unresolved. Obtaine... Full description

Contained in: Transactions of the ASME, Journal of Heat Transfer Vol. 126, No. 4 (2004), p. 518-526
Journal Title: Transactions of the ASME, Journal of Heat Transfer
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Links: Additional Link (dx.doi.org)
ISSN: 1528-8943
Additional Keywords: HYDRAULIK
KANALSTROEMUNG
KUEHLANLAGE
MIKROSYSTEMTECHNIK
SIEDEN
VERDAMPFUNG
WAERMEUEBERTRAGUNG
WASSER
ZWEIPHASENSTROEMUNG
DOI: 10.1115/1.1778187
Notes: Copyright: Metadaten: TEMA, Copyright WTI-Frankfurt eG
Copyright: (C) Alle Rechte beim Herausgeber
Physical Description: 9 Seiten, 16 Bilder, 1 Tabelle, 58 Quellen
ID (e.g. DOI, URN): 10.1115/1.1778187
PPN (Catalogue-ID): WTI041139305
Note: WTI TEMA DB
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520 |a Microchannels are being considered in many advanced heat transfer applications including automotive and stationary fuel cells as well as electronics cooling. However there are a number of fundamental issues from the heat transfer and fluid mechanics perspectives that still remain unresolved. Obtained are fundamental heat transfer data and two-phase flow patterns present during flow boiling in microchannels. Experiments are performed for flow boiling using water in six parallel, horizontal microchannels with a hydraulic diameter of 207 microns. The ranges of parameters are: mass flux from 157 to 1782 kg/m2s, heat flux from 5 to 930 kW/m2, inlet temperature of 22 deg C, quality from sub-cooled to 1.0, and atmospheric pressure at the exit. The corresponding single-phase, all-liquid flow Reynolds number range at the saturation conditions is from 116 to 1318. The measured single-phase, adiabatic pressure drop agreed with the conventional theory within the experimental error. The experimental single-phase Nusselt number was found to be between the constant heat flux and the constant wall temperature boundary conditions, corresponding to Nu(H) and Nu(T), respectively. The flow visualization demonstrates that the flow reversal condition in parallel flow channels is due to bubble nucleation followed by its rapid growth. The dry-out condition is observed, showing a change in the contact angles of the liquid-vapour interface. The local flow boiling heat transfer coefficient exhibits a decreasing trend with increasing quality. A comparison with the nucleate boiling dominant regime of a flow boiling correlation shows good agreement, except for the large peak in two-phase heat transfer coefficient observed at the onset of nucleate boiling. 
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