Abstract
External reactor vessel cooling (ERVC) is an effective strategy to achieve in-vessel retention (IVR) of core melt in the reactor pressure vessel (RPV) under severe accident conditions. Among the available strategies, micro-porous coating technique has been known to enhance the thermal margin of the RPV. In this study, a new and versatile micro-porous coating technique applicable to commercial size reactors known as “Cold Spray” has been developed to coat a hemispherical test vessel. Quenching boiling experiments at different degrees of subcooling (10 °C, 5 °C, 3 °C, 1 °C, and 0 °C) were performed using bare and micro-porous coated vessels. Visual observations of the quenching process along with quantitative analyses of the boiling data were performed. It was found that the critical heat flux (CHF) limit varies significantly with the angular location at all subcooled conditions. Higher cooling rates and CHF limits were obtained with higher degrees of subcooling. A micro-porous coating formed by Cold Spray significantly improved the CHF limit compared to the bare vessel. In fact, nearly 90% enhancement was achieved using the Cold Spray coated vessel. CHF correlations for both bare and micro-porous coated vessel have been proposed capturing the effects of subcooling and angular variation along the outer surface of the hemispherical test vessels.
Original language | English (US) |
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Pages (from-to) | 767-780 |
Number of pages | 14 |
Journal | International Journal of Heat and Mass Transfer |
Volume | 106 |
DOIs | |
State | Published - Mar 1 2017 |
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All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanical Engineering
- Fluid Flow and Transfer Processes
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Effects of subcooling on downward facing boiling heat transfer with micro-porous coating formed by Cold Spray technique. / Sohag, Faruk A.; Beck, Faith; Mohanta, Lokanath; Cheung, Fan-bill B.; Segall, Albert Eliot; Eden, Timothy John; Potter, John K.
In: International Journal of Heat and Mass Transfer, Vol. 106, 01.03.2017, p. 767-780.Research output: Contribution to journal › Article
TY - JOUR
T1 - Effects of subcooling on downward facing boiling heat transfer with micro-porous coating formed by Cold Spray technique
AU - Sohag, Faruk A.
AU - Beck, Faith
AU - Mohanta, Lokanath
AU - Cheung, Fan-bill B.
AU - Segall, Albert Eliot
AU - Eden, Timothy John
AU - Potter, John K.
PY - 2017/3/1
Y1 - 2017/3/1
N2 - External reactor vessel cooling (ERVC) is an effective strategy to achieve in-vessel retention (IVR) of core melt in the reactor pressure vessel (RPV) under severe accident conditions. Among the available strategies, micro-porous coating technique has been known to enhance the thermal margin of the RPV. In this study, a new and versatile micro-porous coating technique applicable to commercial size reactors known as “Cold Spray” has been developed to coat a hemispherical test vessel. Quenching boiling experiments at different degrees of subcooling (10 °C, 5 °C, 3 °C, 1 °C, and 0 °C) were performed using bare and micro-porous coated vessels. Visual observations of the quenching process along with quantitative analyses of the boiling data were performed. It was found that the critical heat flux (CHF) limit varies significantly with the angular location at all subcooled conditions. Higher cooling rates and CHF limits were obtained with higher degrees of subcooling. A micro-porous coating formed by Cold Spray significantly improved the CHF limit compared to the bare vessel. In fact, nearly 90% enhancement was achieved using the Cold Spray coated vessel. CHF correlations for both bare and micro-porous coated vessel have been proposed capturing the effects of subcooling and angular variation along the outer surface of the hemispherical test vessels.
AB - External reactor vessel cooling (ERVC) is an effective strategy to achieve in-vessel retention (IVR) of core melt in the reactor pressure vessel (RPV) under severe accident conditions. Among the available strategies, micro-porous coating technique has been known to enhance the thermal margin of the RPV. In this study, a new and versatile micro-porous coating technique applicable to commercial size reactors known as “Cold Spray” has been developed to coat a hemispherical test vessel. Quenching boiling experiments at different degrees of subcooling (10 °C, 5 °C, 3 °C, 1 °C, and 0 °C) were performed using bare and micro-porous coated vessels. Visual observations of the quenching process along with quantitative analyses of the boiling data were performed. It was found that the critical heat flux (CHF) limit varies significantly with the angular location at all subcooled conditions. Higher cooling rates and CHF limits were obtained with higher degrees of subcooling. A micro-porous coating formed by Cold Spray significantly improved the CHF limit compared to the bare vessel. In fact, nearly 90% enhancement was achieved using the Cold Spray coated vessel. CHF correlations for both bare and micro-porous coated vessel have been proposed capturing the effects of subcooling and angular variation along the outer surface of the hemispherical test vessels.
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U2 - 10.1016/j.ijheatmasstransfer.2016.09.091
DO - 10.1016/j.ijheatmasstransfer.2016.09.091
M3 - Article
AN - SCOPUS:85002605731
VL - 106
SP - 767
EP - 780
JO - International Journal of Heat and Mass Transfer
JF - International Journal of Heat and Mass Transfer
SN - 0017-9310
ER -