Next Article in Journal
Algorithm for Reducing Truck Noise on Via Baltica Transport Corridors in Lithuania
Previous Article in Journal
High Channel Density Ceramic Microchannel Reactor for Syngas Production
Open AccessArticle

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

1
Laboratory for Design of Microsystems, Department of Microsystems Engineering (IMTEK), University of Freiburg, 79110 Freiburg, Germany
2
Institute for Micro Process Engineering (IMVT), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany
*
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Energies 2020, 13(23), 6473; https://doi.org/10.3390/en13236473
Received: 26 October 2020 / Revised: 25 November 2020 / Accepted: 3 December 2020 / Published: 7 December 2020
(This article belongs to the Section Energy Fundamentals and Conversion)
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·m2·s1 to 118.8 kg·m2·s1 and heat fluxes in the range of 14.7 kW·m2 to 116.54 kW·m2. 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. From these measurements, useful parameters for use in models on boiling like the 3-zone model were shown. It was shown that the sensing method can shed a precise light on unknown features locally in slug flow such as residence time of each phases, bubble frequency, and duty cycle. View Full-Text
Keywords: boiling flow; microchannel; heat transfer analysis; local sensing elements; impedance measurement; local sensing; bubble frequency; flow regime boiling flow; microchannel; heat transfer analysis; local sensing elements; impedance measurement; local sensing; bubble frequency; flow regime
Show Figures

Figure 1

MDPI and ACS Style

Talebi, M.; Sadir, S.; Kraut, M.; Dittmeyer, R.; Woias, P. Local Heat Transfer Analysis in a Single Microchannel with Boiling DI-Water and Correlations with Impedance Local Sensors. Energies 2020, 13, 6473. https://doi.org/10.3390/en13236473

AMA Style

Talebi M, Sadir S, Kraut M, Dittmeyer R, Woias P. Local Heat Transfer Analysis in a Single Microchannel with Boiling DI-Water and Correlations with Impedance Local Sensors. Energies. 2020; 13(23):6473. https://doi.org/10.3390/en13236473

Chicago/Turabian Style

Talebi, Mohammadmahdi; Sadir, Sahba; Kraut, Manfred; Dittmeyer, Roland; Woias, Peter. 2020. "Local Heat Transfer Analysis in a Single Microchannel with Boiling DI-Water and Correlations with Impedance Local Sensors" Energies 13, no. 23: 6473. https://doi.org/10.3390/en13236473

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Search more from Scilit
 
Search
Back to TopTop