Experimental investigation of inverted annular film boiling in a rod bundle during reflood transient

L. Mohanta; M. P. Riley; F. B. Cheung; S. M. Bajorek; J. M. Kelly; K. Tien; C. L. Hoxie

doi:10.13182/NT14-77

Experimental investigation of inverted annular film boiling in a rod bundle during reflood transient

L. Mohanta, M. P. Riley, F. B. Cheung, S. M. Bajorek, J. M. Kelly, K. Tien, C. L. Hoxie

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11 Scopus citations

Abstract

Heat transfer results for subcooled and saturated inverted annular film boiling (IAFB) obtained from a 7×7 rod bundle during transient reflood are presented in this paper. The test section consists of heater rods of 9.5-mm diameter and 12.6-mm pitch arranged in a square array. Flooding rates considered are 0.076 and 0.152 m/s, pressure varied from 138 to 414 kPa, and inlet subcooling up to 83 K. Evaluation of the data includes estimation of the local void fraction and Nusselt number during IAFB as well as in the inverted slug film boiling (ISFB) regime, which occurs when the inverted annular liquid column disintegrates. Experimental heat transfer results are compared with several film boiling models, and a new correlation for the Nusselt number is proposed for the IAFB and ISFB regimes. Predicted Nusselt numbers using the new correlation deviate fivm the experimental data by an average error of 15% and root-mean-square error of ∼30%.

Original language	English (US)
Pages (from-to)	301-312
Number of pages	12
Journal	Nuclear Technology
Volume	190
Issue number	3
DOIs	https://doi.org/10.13182/NT14-77
State	Published - Jun 1 2015

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Nuclear Energy and Engineering
Condensed Matter Physics

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title = "Experimental investigation of inverted annular film boiling in a rod bundle during reflood transient",

abstract = "Heat transfer results for subcooled and saturated inverted annular film boiling (IAFB) obtained from a 7×7 rod bundle during transient reflood are presented in this paper. The test section consists of heater rods of 9.5-mm diameter and 12.6-mm pitch arranged in a square array. Flooding rates considered are 0.076 and 0.152 m/s, pressure varied from 138 to 414 kPa, and inlet subcooling up to 83 K. Evaluation of the data includes estimation of the local void fraction and Nusselt number during IAFB as well as in the inverted slug film boiling (ISFB) regime, which occurs when the inverted annular liquid column disintegrates. Experimental heat transfer results are compared with several film boiling models, and a new correlation for the Nusselt number is proposed for the IAFB and ISFB regimes. Predicted Nusselt numbers using the new correlation deviate fivm the experimental data by an average error of 15% and root-mean-square error of ∼30%.",

author = "L. Mohanta and Riley, {M. P.} and Cheung, {F. B.} and Bajorek, {S. M.} and Kelly, {J. M.} and K. Tien and Hoxie, {C. L.}",

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doi = "10.13182/NT14-77",

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T1 - Experimental investigation of inverted annular film boiling in a rod bundle during reflood transient

AU - Mohanta, L.

AU - Riley, M. P.

AU - Cheung, F. B.

AU - Bajorek, S. M.

AU - Kelly, J. M.

AU - Tien, K.

AU - Hoxie, C. L.

PY - 2015/6/1

Y1 - 2015/6/1

N2 - Heat transfer results for subcooled and saturated inverted annular film boiling (IAFB) obtained from a 7×7 rod bundle during transient reflood are presented in this paper. The test section consists of heater rods of 9.5-mm diameter and 12.6-mm pitch arranged in a square array. Flooding rates considered are 0.076 and 0.152 m/s, pressure varied from 138 to 414 kPa, and inlet subcooling up to 83 K. Evaluation of the data includes estimation of the local void fraction and Nusselt number during IAFB as well as in the inverted slug film boiling (ISFB) regime, which occurs when the inverted annular liquid column disintegrates. Experimental heat transfer results are compared with several film boiling models, and a new correlation for the Nusselt number is proposed for the IAFB and ISFB regimes. Predicted Nusselt numbers using the new correlation deviate fivm the experimental data by an average error of 15% and root-mean-square error of ∼30%.

AB - Heat transfer results for subcooled and saturated inverted annular film boiling (IAFB) obtained from a 7×7 rod bundle during transient reflood are presented in this paper. The test section consists of heater rods of 9.5-mm diameter and 12.6-mm pitch arranged in a square array. Flooding rates considered are 0.076 and 0.152 m/s, pressure varied from 138 to 414 kPa, and inlet subcooling up to 83 K. Evaluation of the data includes estimation of the local void fraction and Nusselt number during IAFB as well as in the inverted slug film boiling (ISFB) regime, which occurs when the inverted annular liquid column disintegrates. Experimental heat transfer results are compared with several film boiling models, and a new correlation for the Nusselt number is proposed for the IAFB and ISFB regimes. Predicted Nusselt numbers using the new correlation deviate fivm the experimental data by an average error of 15% and root-mean-square error of ∼30%.

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Experimental investigation of inverted annular film boiling in a rod bundle during reflood transient

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