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Local Heat Transfer Analysis in a Single Microchannel with Boiling DI-Water and Correlations with Impedance Local Sensors

Talebi, Mohammadmahdi; Sadir, Sahba; Kraut, Manfred; Dittmeyer, Roland; Woias, Peter

Abstract:
Determination of local heat transfer coefficient at the interface of channel wall and fluid was the main goal of this experimental study in microchannel flow boiling domain. Flow boiling heat transfer to DI-water in a single microchannel with a rectangular cross section was experimentally investigated. The rectangular cross section dimensions of the experimented microchannel were 1050 μm × 500 μm and 1500 μm × 500 μm. Experiments under conditions of boiling were performed in a test setup, which allows the optical and local impedance measurements of the fluids by mass fluxes of 22.1 kg⋅m$^{-2}$⋅s$^{-1}$ to 118.8 kg⋅m$^{-2}$⋅s$^{-1}$ and heat fluxes in the range of 14.7 kW⋅m$^{-2}$ to 116.54 kW⋅m$^{-2}$. The effect of the mass flux, heat flux, and flow pattern on flow boiling local heat transfer coefficient and pressure drop were investigated. Experimental data compared to existing correlations indicated no single correlation of good predictive value. This was concluded to be the case due to the instability of flow conditions on one hand and the variation of the flow regimes over the experimental conditions on the other hand. The results from the local impedance measurements in correlation to the optical measurements shows the flow regime variation at the experimental conditions. ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000127426
Veröffentlicht am 10.12.2020
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Mikroverfahrenstechnik (IMVT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1996-1073
KITopen-ID: 1000127426
HGF-Programm 34.12.01 (POF III, LK 01) Multiphasen und thermische Prozesse
Erschienen in Energies
Verlag MDPI
Band 13
Heft 23
Seiten Art.-Nr.: 6473
Vorab online veröffentlicht am 07.12.2020
Schlagwörter boiling flow, microchannel, heat transfer analysis, local sensing elements, impedance measurement, local sensing, bubble frequency, flow regime
Nachgewiesen in Dimensions
Web of Science
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