Heat transfer during quenching of high temperature surface by the falling cryogenic liquid film

Starodubtseva, I. P.; Павленко, А. Н.; Surtaev, Anton

doi:10.1016/j.ijthermalsci.2016.12.015

Cited by 25 publications

(6 citation statements)

References 15 publications

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“…The dynamic pattern of quench front propagation obtained numerically with this parameters correlates satisfactorily with the pattern observed in the cryogenic experiment [2] with a capillary-porous-coated surface, (Fig. 1a), and the pattern, observed in the experiment [1] with a smooth surface, (Fig 1b). The velocity of quench front movement along the surface, obtained numerically, correlates well with the experimental data obtained by processing high-speed video recording (lower graph 1a).…”

Section: Resultssupporting

confidence: 82%

“…In this paper, a numerical model of quenching by a flowing down film of a cryogenic fluid (LN2) for vertically oriented smooth and capillary-porous-coated copper plates is implemented. The results of computational experiments are shown in comparison with the experimental data presented in work [1] for a smooth surface and in [2] for a surface with a structured capillary-porous coating. As a cooling media, we used a downward flowing liquid nitrogen film LN2 at atmospheric pressure on the saturation line.…”

Section: Numerical Simulationmentioning

confidence: 97%

“…A bronze powder was used for spraying. The experimental setup and experimental parameters are presented in detail in [1,2]. The initial temperature of the sample under study, T0 =218 K, was higher than the TLFP (Leidenfrost temperature) and even higher than the critical temperature Tcr.…”

Section: Numerical Simulationmentioning

confidence: 99%

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Parameters of temperature disturbance triggering the propagation of the quench front on an extremely overheated surface

Starodubtseva

Павленко

2021

J. Phys.: Conf. Ser.

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The results of computational experiments simulating the triggering of the quench front propagation on the superheated vertically oriented metal plates are presented. The plates are quenched by a gravitationally flowing down liquid nitrogen film. The temperature of the test samples at the beginning of the process was higher than the critical temperature and the Leidenfrost temperature, which means that direct long-term liquid-solid contact is impossible. For this reason, the front is initially motionless. As a result of numerical simulation, a dynamic pattern of the quench front propagation on a high-temperature surface was obtained. Analysis of the results allowed to find the realistic values of heat sink into the cooling medium, as well as the parameters of the local temperature disturbance, its spatial extent and amplitude, at which the conditions are created for triggering the process of quench front propagation on the high-temperature surface. Direct comparison of the numerical simulations results with experimental data on the velocity, geometry of the quench front and on the dynamical pattern of the process confirmed the reliability of the results obtained.

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Section: Resultssupporting

confidence: 82%

Section: Numerical Simulationmentioning

confidence: 97%

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Parameters of temperature disturbance triggering the propagation of the quench front on an extremely overheated surface

Starodubtseva

Павленко

2021

J. Phys.: Conf. Ser.

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“…Numerical computational methods can be used to accurately determine the impact of the location and technical-utility parameters of buildings on their energy management. They allow for the analysis of variability of selected indicators, for non-stationary conditions [31][32][33]. Having considered that the results obtained are purely theoretical, they should always be critically verified by performing a calculation validation process.…”

Section: Discussionmentioning

confidence: 99%

Numerical Analysis of the Impact of the Location of a Commercial Broiler House on Its Energy Management and Heat Exchange with the Ground

et al. 2021

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This paper addresses the impact of location on energy management and ground heat transfer in a commercial large-scale broiler house. Four locations in Europe were selected for analysis: Krakow (Poland), Vienna (Austria), Modena (Italy), and Oslo (Norway). An analysis of the impact of location on energy management was performed using the numerical method of computing elemental balances (MEB). WUFIplus® computer software was used to assist in the calculation process. Computer simulations of the effects of location on selected technical factors were performed after validating the computational model. The complex area of building and land was divided into cuboidal balance–difference elements using model discretization. Energy and temperature balance calculations were performed for each balance–difference element assuming a time step every 60 min. Validation of the computational model was performed based on the measured temperature inside and outside the broiler house. The variation in outdoor climate significantly affected the energy flow through the building envelope and ventilation system. Providing that the same material and construction solutions are adopted, a building located in the south of Europe requires 43% less energy for heating compared to a building located in the northern part of the continent. Due to it having the highest solar radiation, the highest energy gains were obtained for the building located in Modena. The buildings located in Krakow and Vienna had a 50% lower yield of thermal energy from the external environment. The percentage of land in the energy balance of the studied building ranged from 8.00 to 8.56%, depending on location. The highest energy gains were obtained for the building located in Modena (4112.8 kWh/a). The buildings located in Krakow and Vienna were characterized by a heat energy yield from the external environment that was two times lower. For the site located in Oslo, it was found that the largest thermal energy gain came from the ground medium located under and surrounding the broiler house (1137 kWh/a). The location of the broiler house significantly affects year-round heating needs. The building located in Oslo required 677,207.2 kWh/a of energy for heating purposes.

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“…Works of the authors [138][139][140][141][142][143][144][145][146][147][148][149] study regularities of heat transfer during evaporation, boiling, and decay of falling nitrogen films, accompanied by development of crisis phenomena at unsteady heat release and unsteady cooling of strongly overheated bodies by falling nitrogen films. The results of experimental investigations of the dynamics of heat transfer and critical phenomena in falling wavy films of nitrogen at unsteady heat release from the surface of a thin-walled heater are presented in [138,139].…”

Section: Heat Transfer Enhancement and Increase In Critical Heat Flux At Film Flowsmentioning

confidence: 99%

Development of Methods for Heat Transfer Enhancement During Nitrogen Boiling to Ensure Stabilization of HTS Devices

Павленко

Кузнецов

2021

J. Engin. Thermophys.

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The paper presents a brief analysis of current achievements and key issues in the field of heat transfer and critical heat flux enhancement during boiling of cryogenic liquids and freons under various heat release laws via micro-structuring of the heat-generating surface. A review of new experimental data on the efficiency of heat transfer and critical heat flux enhancement during pool boiling via new micro-structured capillary-porous coatings created by plasma sputtering and selective laser melting/sintering (3D printing) is presented. The results of analysis of the efficiency of heat transfer and critical heat flux during boiling on heat-generating surfaces with micro-textures of different shapes and micro-profiling created by micro-deforming cutting are presented. New results obtained during nitrogen boiling under various hydrodynamical conditions on the mechanisms of sharp increase in the rate of non-stationary cooling of plates with new structured capillary-porous or low-heat-conductivity coatings with certain parameters are discussed. New results on the degree of heat transfer enhancement during boiling of liquids on micro-structured surfaces modified by the method of micro-arc oxidation are presented.

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Heat transfer during quenching of high temperature surface by the falling cryogenic liquid film

Cited by 25 publications

References 15 publications

Parameters of temperature disturbance triggering the propagation of the quench front on an extremely overheated surface

Parameters of temperature disturbance triggering the propagation of the quench front on an extremely overheated surface

Numerical Analysis of the Impact of the Location of a Commercial Broiler House on Its Energy Management and Heat Exchange with the Ground

Development of Methods for Heat Transfer Enhancement During Nitrogen Boiling to Ensure Stabilization of HTS Devices

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