Heat transfer in inverted annular mode of steam-water flow

Agafonova, N. D.; Paramonova, I. L.

doi:10.1134/s0040601513030014

Cited by 10 publications

(8 citation statements)

References 7 publications

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“…Before going to specifi c evaluation of heat transfer through the phase boundary, we note the following. In the foregoing the similarity of the processes occurring during Miropol'sky (1963) and Bishop et al (1964Bishop et al ( , 1965 Groeneveld (1984), and q w = 496 kW/m 2 : 1) experimental data, 2) calculated results adapted from Agafonova and Paramonova (2013), and 3) calculated results of original model data adapted from Hammouda et al (19 97) cooling after quenching and in the inverted annular mode was indicated. However, there is an important fact regarding the similarity.…”

Section: Simplest Theoretical Evaluation Of Heat Transfer Through Thementioning

confidence: 78%

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Specific Features of Strongly Superheated Steam Condensation on the Surface of a Strongly Subcooled Water Jet

Gotovskii¹,

Михайлов²,

Sukhorukov³

et al. 2017

Inter J Ener Clean Env

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Section: Simplest Theoretical Evaluation Of Heat Transfer Through Thementioning

confidence: 78%

“…In the work of Agafonova and Paramonova (2013), devoted to the improvement of the Russian code KORSAR, a somewhat modernized variant of the formula, proposed in Hammouda et al (1997) was used.…”

Section: Fig 5: Experimental Data Adapted Frommentioning

confidence: 99%

Specific Features of Strongly Superheated Steam Condensation on the Surface of a Strongly Subcooled Water Jet

Gotovskii¹,

Михайлов²,

Sukhorukov³

et al. 2017

Inter J Ener Clean Env

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“…It was shown that the temperature variation across the near-wall vapor layer and therefore the change in the physical properties of vapor may be considerable and produces an essential effect on the heat transfer and drag friction in vapor as compared with their values at constant physical properties of vapor (Petukhov, 1967;Kays & Leunge, 1963). According to our calculations (Agafonova & Paramonova, 2013) for the conditions of the experiments by Chen (2011) the wall temperature (t w , o C) was nearly two or three times as large as compared with the interfacial surface (or the liquid core surface) temperature which is equal to the saturation temperature (t s , o C). It is known (Petukhov, 1967;Kays & Leunge, 1963) that for given situation: where Nu -the Nusselt number at the varying physical properties; Nu nc -the Nusselt number at the constant physical properties.…”

Section: Heat Transfer and The Wall Temperature Calculations In The Imentioning

confidence: 99%

“…This model is used in the latest versions of modern computer best estimate codes for in-circuit hydrodynamics and heat transfer, such as the KORSAR and TRAC codes. Some problems connected with the wall temperature calculation when using the Hammouda model are considered by Agafonova & Paramonova (2013). It was shown that the temperature variation across the near-wall vapor layer and therefore the change in the physical properties of vapor may be considerable and produces an essential effect on the heat transfer and drag friction in vapor as compared with their values at constant physical properties of vapor (Petukhov, 1967;Kays & Leunge, 1963).…”

Section: Heat Transfer and The Wall Temperature Calculations In The Imentioning

confidence: 99%

The Improvement of the Wall Temperature Calculation Procedure for the Post-Crisis Region of the NPP Heated Channels

Agafonova¹,

Paramonova²

2014

MER

Self Cite

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The reliable wall temperature prediction is important for the analysis of operation and safety of both nuclear reactors and direct-flow steam generators with high-temperature fluids. The onset of dangerous temperature excursion is possible in the post-crisis region of the heated channels when the inverted annular or the dispersed flow regime occurs. The wall temperature calculations for both flow regimes are represented. The data of Hammouda, Lapperiere, Chen, Miropolsky, Bennett and some other investigators were processed. The obtained average error and deviation are less than those which take place when special best estimate computer code KORSAR is used. Specified result was reached by the way of the engineering procedures correction and may be applied for the closure correlations improvement which is needed in two-fluid two-phase flow models. The conclusion is made that the correct choice of the integration step and the method of the critical quality determination produce effect on the adequate wall temperature prediction.

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“…In gas-and-gas heat exchangers with low external heat output and high values on the inner surface of pipes, use of thermosyphon slightly increases the overall surface compared to traditional heat exchangers [7]. In this case, temperature of the pipes is close to the saturation temperature of two-phase medium in the thermosyphon and is practically the same in length [8][9][10][11]. By varying the ratio of the lengths of the heating and cooling zones, it is possible to vary this temperature in the range between the temperatures of the heatexchanging gaseous media.…”

Section: Introductionmentioning

confidence: 99%

High-temperature service life tests of full-size thermosyphons

Balunov¹,

Egorov

2019

E3S Web Conf.

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During past two decades, at temperature 240-265°C, resource tests were carried out on 19 thermosyphons of full-scale sizes: 45х4 mm in diameter, 4.92 m in length. The thermosyphons were prepared with varying preliminary surface treatment methods, composition of the aqueous solution to be poured into the thermosyphons, location of titanium chips in the perforated capsules under the lid of the thermosyphons. With a period of 1 to 3 years, thermosyphons were removed from testing system for 30 hours to control the vacuum by thermal method that does not require depressurization. At the last control experiment, four thermosyphons are depressurized for the following purposes: to check the condition of their internal surface in different zones along the length; for the chemical analysis of the aqueous solution poured from them; to determine the structure and characteristics of the mechanical properties of the thermosyphon metal. The main aim of the tests is to justify maintaining the structure and mechanical properties of the metal for a long time, keeping a vacuum of 90-95% inside the thermosyphon, ensuring high heat transfer characteristics of the boiling operating mode of thermosyphons.

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Heat transfer in inverted annular mode of steam-water flow

Cited by 10 publications

References 7 publications

Specific Features of Strongly Superheated Steam Condensation on the Surface of a Strongly Subcooled Water Jet

Specific Features of Strongly Superheated Steam Condensation on the Surface of a Strongly Subcooled Water Jet

The Improvement of the Wall Temperature Calculation Procedure for the Post-Crisis Region of the NPP Heated Channels

High-temperature service life tests of full-size thermosyphons

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