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Experimental Results and Interfacial Lift-off Model Predictions of Critical Heat Flux for Flow Boiling with Subcooled Inlet Conditions – In Preparation for Experiments Onboard the International Space StationThis study investigates critical heat flux (CHF) for subcooled flow boiling of n-Perfluorohexane based on results of pre-launch Earth-gravity Mission Sequence Tests (MSTs) of the Flow Boiling and Condensation Experiment (FBCE), which was launched to the International Space Station (ISS) in August 2021. CHF measurements were made in a rectangular channel having a 2.5 mm by 5 mm cross-section and a 114.6-mm long heated segment. Both single-sided and double-sided heating were tested in vertical upflow in Earth gravity for a variety of inlet conditions. The inlet subcooling was varied in the range of 0.4 – 32.0°C and encompassed both near-saturated and highly subcooled conditions. Experimental trends and high-speed video records were investigated to better understand the mechanism of CHF. Overall trends show CHF increases as flow rate and/or inlet subcooling are increased. Flow features from the events around CHF justify the applicability of the Interfacial Lift-off Model and the determination of limiting criteria for its application. The present experimental data are combined with prior databases for various flow orientations with respect to Earth gravity and microgravity data collected on parabolic flights. Predictions are made using the Interfacial Lift-off Model for this consolidated subcooled-inlet FBCE-CHF database. A heat utility ratio was included in the model to capture the effects of subcooling and corresponding thermodynamic non-equilibrium. An overall mean absolute error of 19.04% indicates good predictive capability of the model for both heating configurations, different gravity environments, and a wide range of inlet subcooling.
Document ID
20210024251
Acquisition Source
Glenn Research Center
Document Type
Accepted Manuscript (Version with final changes)
Authors
Steven J Darges
(Purdue University West Lafayette West Lafayette, Indiana, United States)
V S Devahdhanush
(Purdue University West Lafayette West Lafayette, Indiana, United States)
Isaam Mudawar
(Purdue University West Lafayette West Lafayette, Indiana, United States)
Henry K Nahra
(Glenn Research Center Cleveland, Ohio, United States)
R Balasubramaniam
(Case Western Reserve University Cleveland, Ohio, United States)
Mohammad M Hasan
(Glenn Research Center Cleveland, Ohio, United States)
Jeffrey R Mackey
(HX5, LLC)
Date Acquired
November 11, 2021
Publication Date
November 28, 2021
Publication Information
Publication: International Journal of Heat and Mass Transfer
Publisher: Elsevier
Volume: 183
Issue Publication Date: February 1, 2022
ISSN: 0017-9310
e-ISSN: 1879-2189
Subject Category
Fluid Mechanics And Thermodynamics
Funding Number(s)
WBS: 619352.06.11.03.02.01
Distribution Limits
Public
Copyright
Use by or on behalf of the US Gov. Permitted.
Technical Review
Professional Review
Keywords
flow boiling
critical heat flux
subcooled inlet
flow visualization
interfacial lift-off model
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