Heat transfer in free-convection sodium boiling

Deev, V. I.; Dubrovskii, G. P.; Kokorev, L. S.; Novikov, I. I.; Petrovichev, V. I.

doi:10.1007/bf01225399

“…The heat transfer coefficient of Na is high when in the boiling regime, and is an order of magnitude higher than what would be expected in a free convection (Deev et al 1967). In this counter current arrangement, the heat transfer parameter is solely governed by He, which the following equation shows Operating at higher pressure will raise the boiling point temperature of Na such that it will boil at a much higher temperature than 1,156 K. Figure 6-6 shows a pressure drop for the entire system, which is not that high, so the design could still be optimized.…”

Section: Resultsmentioning

confidence: 71%

“…Convection heat transfer data for turbulent flow is available for many liquid metals (Hsia 1970, Deev et al 1967, Hoffman et al 1962, Borishanskii 1965, and Kakac and Spalding 1979. Some acceptable equations have been developed, but only limited information is available for boiling sodium.…”

Section: Liquid Metal Phase Change Heat Exchangermentioning

confidence: 99%

Engineering Design Elements of a Two-Phase Thermosyphon to Trannsfer NGNP Nuclear Thermal Energy to a Hydrogen Plant

Sabharwal¹

2009

5

0

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Three hydrogen production processes, powered by a Next Generation Nuclear Plant (NGNP), are currently under investigation at Idaho National Laboratory. The first is high-temperature steam electrolysis, which uses both heat and electricity; the second is thermo-chemical production through the sulfur iodine process primarily using heat; the third is a hybrid sulfur process (not part of this study) which incorporates sulfur acid decomposition and sulfur dioxide depolarized electrolysis, all processes require a high temperature (>850°C) for enhanced efficiency; temperatures indicative of the NGNP. Safety and licensing mandates prudently dictate that the NGNP and the hydrogen production facility be physically isolated, perhaps requiring separation of over 100 m. This research presents useful insights into making decisions regarding the thermosyphon heat transfer system between the nuclear reactor and chemical plant. Developing very high-temperature reactor technologies for producing electricity, hydrogen, and other energy products is a high priority for a successful national energy future.

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“…Forced convection boiling heat transfer coefficient is an order of magnitude higher than what is expected in a free convection. 6) The overall heat transfer coefficient is solely governed by He-side heat transfer coefficient. The heat transfer coefficient and the pressure drop have controlling influence in the design of the phase change heat exchanger.…”

Section: Resultsmentioning

confidence: 99%

“…Convection heat transfer data for turbulent flow is available for many liquid metals. [5][6][7][8][9] Some acceptable equations have been developed but only limited information is available for boiling sodium. The objective of this work is to analyze the heat transfer and pressure drop characteristics of a heat exchanger utilizing boiling sodium as the secondary heat transfer medium.…”

Section: Introductionmentioning

confidence: 99%

Design of Liquid Metal Phase Change Heat Exchanger for Next-Generation Nuclear Plant Process Heat Application

Sabharwall¹,

Utgikar

²

,

Tokuhiro³

et al. 2009

J. Nucl. Sci. Technol.

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The Next Generation Nuclear Plant will most likely produce electricity and its reactor heat will be further utilized for the production of hydrogen, oil recovery from tar sands and oil shales, and other process heat applications, that will further the nation's pursuit of energy independence. An intermediate heat exchanger is required to transfer heat from the Next-Generation Nuclear Plant to the hydrogen plant (or other processes) in the most efficient way possible. Phase change heat exchangers are quite attractive in this regard, as they can transfer process heat more efficiently than for the single phase due to the advantage of high-enthalpy transport that includes the sensible heat of liquid, the latent heat of vaporization, and possible vapor superheat. This paper explores the overall heat transfer characteristics and pressure drop of the phase change heat exchanger with helium as the primary and sodium as the secondary heat exchanger coolant. For a two-phase boiling regime, the convective heat transfer coefficient is based on the concept of an additive, interacting mechanism of micro-and macroconvective heat transfer. In this analysis an improved design is proposed for given conditions, so as to obtain a lower overall pressure drop and a moderate/high overall heat transfer coefficient. The analysis presented in this paper will be useful as a guide for future experimental work for Next Generation Nuclear Plant process heat transfer.

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“…[5][6][7][8][9] Some acceptable equations have been developed but only limited information is available for boiling sodium. The objective of this work is to analyze the heat transfer and pressure drop characteristics of a heat exchanger utilizing boiling sodium as the secondary heat transfer medium.…”

Section: Introductionmentioning

confidence: 99%

Design of Liquid Metal Phase Change Heat Exchanger for Next-Generation Nuclear Plant Process Heat Application

Sabharwall¹,

Utgikar

²

,

Tokuhiro³

et al. 2009

Journal of Nuclear Science and Technology

7

0

View full text Add to dashboard Cite

The Next Generation Nuclear Plant will most likely produce electricity and its reactor heat will be further utilized for the production of hydrogen, oil recovery from tar sands and oil shales, and other process heat applications, that will further the nation's pursuit of energy independence. An intermediate heat exchanger is required to transfer heat from the Next-Generation Nuclear Plant to the hydrogen plant (or other processes) in the most efficient way possible. Phase change heat exchangers are quite attractive in this regard, as they can transfer process heat more efficiently than for the single phase due to the advantage of high-enthalpy transport that includes the sensible heat of liquid, the latent heat of vaporization, and possible vapor superheat. This paper explores the overall heat transfer characteristics and pressure drop of the phase change heat exchanger with helium as the primary and sodium as the secondary heat exchanger coolant. For a two-phase boiling regime, the convective heat transfer coefficient is based on the concept of an additive, interacting mechanism of micro-and macroconvective heat transfer. In this analysis an improved design is proposed for given conditions, so as to obtain a lower overall pressure drop and a moderate/high overall heat transfer coefficient. The analysis presented in this paper will be useful as a guide for future experimental work for Next Generation Nuclear Plant process heat transfer.

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Heat transfer in free-convection sodium boiling

Cited by 3 publications

References 1 publication

Engineering Design Elements of a Two-Phase Thermosyphon to Trannsfer NGNP Nuclear Thermal Energy to a Hydrogen Plant

Engineering Design Elements of a Two-Phase Thermosyphon to Trannsfer NGNP Nuclear Thermal Energy to a Hydrogen Plant

Design of Liquid Metal Phase Change Heat Exchanger for Next-Generation Nuclear Plant Process Heat Application

Design of Liquid Metal Phase Change Heat Exchanger for Next-Generation Nuclear Plant Process Heat Application

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