Results of Experimental Studies of Heat-and-Mass Transfer Processes in a Two-Phase Closed Thermosyphon

Александров, А.А.; Akat’ev, V. A.; Тюрин, М.П.; Бородина, Е.С.; Kochetov, O. S.

doi:10.18698/1812-3368-2018-4-46-58

HoBMSTU.SNS

2018

DOI: 10.18698/1812-3368-2018-4-46-58

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Results of Experimental Studies of Heat-and-Mass Transfer Processes in a Two-Phase Closed Thermosyphon

А.А. Александров¹,

V. A. Akat’ev²,

М.П. Тюрин³

et al.

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“…Issues related to analytical solution of heat exchange nonstationary problems were considered in many works, for example, in [2][3][4][5][6][7][8]. Such problems include the processes of heating and cooling various bodies under different unambiguity conditions, which significantly influences the final form of the process mathematical description.…”

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confidence: 99%

Analytical Study of Nonstationary Modes in Recuperative Heat Exchangers

Александров

Akat’ev

Tyurin³

et al. 2020

HoBMSTU.SNS

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Recuperative heat exchanger transient operation modes during the start-up were considered in order to identify the time for establishing the stationary mode. This is important in carrying out technological processes that require constancy in values of certain parameters ensuring both product quality and process safety. The research was carried out using the analytical method for direct-flow and counter-flow heat exchangers. It was demonstrated that stationary state establishment in the direct-flow heat exchangers occurs immediately after the heat carrier gets into the apparatus. It should be noted that the entire apparatus reaches the stationary mode, when the slower heat carrier arrives at the apparatus output section. In case of a heat exchanger with the heat carrier counter-flow, it was found out that at the moment of the less heated heat carrier appearing at the apparatus output section, it was having the highest temperature. Then the temperature was decreasing, and after passing its minimum was beginning to oscillate along a curve with the damping amplitude. In the case under consideration, the stationary process started, when the dimensionless time value was ϕ ≥ 0.5. The indicated solution was obtained under assumption that thermal and physical characteristics were constant in time and space. It was assumed that total heat capacity of the heat exchanger heat transferring wall was infinitesimal. This assumption is valid with an error of up to 1 % at Fo ≥ 100, which is the case in most practical cases. For apparatuses under study, a formula was also obtained for the time required to reach the stationary state

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Analytical Study of Nonstationary Modes in Recuperative Heat Exchangers

Александров

Akat’ev

Tyurin³

et al. 2020

HoBMSTU.SNS

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Development of water-diesel emulsion through the employment of vibration

Adorni

Tyurina

Urushkina

et al. 2021

IOP Conf. Ser.: Earth Environ. Sci.

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With this study, we want to analyse the different techniques used to develop emulsions and then apply a new mechanism to manufacture a water-in diesel emulsion that would be stable for a relatively long period. After the research on previous studies, we confidently applied the knowledge acquired during the time of personal study and the research to develop a system that brought us to keep in a semi-stable state an emulsion of water and diesel for a period of 24 hours. In this research we are not focusing on one of the two aspects that should be noted once you study emulsions: we are trying to develop a stable emulsion through the employment of vibrations without considering the employment of such emulsion in an engine, for the moment.

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Results of Experimental Studies of Heat-and-Mass Transfer Processes in a Two-Phase Closed Thermosyphon

Cited by 2 publications

References 0 publications

Analytical Study of Nonstationary Modes in Recuperative Heat Exchangers

Analytical Study of Nonstationary Modes in Recuperative Heat Exchangers

Development of water-diesel emulsion through the employment of vibration

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