Heat transfer enhancement and critical heat fluxes in boiling of microfinned surfaces

Попов, И. А.; Щелчков, А. В.; Gortyshov, Yu. F.; Зубков, Н. Н.

doi:10.1134/s0018151x17030208

Cited by 37 publications

(9 citation statements)

References 30 publications

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“…It should be noted that the simulation was carried out for stationary operation of the gas generator. During start-up and warm-up, the power consumption is naturally higher [35][36][37].…”

Section: Resultsmentioning

confidence: 99%

Efficiency of biomass and solid waste energy processing based on the cogeneration plant with plasma heat source

et al. 2019

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The urgency of the use of low-grade organic fuels and wastes, in particular municipal solid (MSW), is due to recent developments in energy saving and energy efficiency. This directly relates to the direction of renewable energy, responsible for involving all wastes, such as MSW, in fuel energy balance to provide heat and electricity to decentralized power supply areas. This paper presents the process of hightemperature thermal decomposition of MSW in the steam-air medium of plasma under excessive pressure to generate electrical energy. The high enthalpy and great reactivity of the plasma gasifying agent makes it possible to carry out the process of thermal decomposition in the autothermal mode. The high-temperature mode and the use of plasma blast provides a high degree of conversion of waste into combustible components (CO, CH4, H2), the resulting gas mixture. The technological process significantly reduces the formation of potentially hazardous substances that affect the kinetics of the process. After generating electrical energy, the exhaust gases are subjected to complex purification from the products of combustion and cogeneration of residual thermal energy. In particular, purification from toxic nitrogen oxides (NOx) occurs, the formation of dioxins, furans and other dangerous derivatives of chloride compounds is prevented. Thermal energy, discharged at various sites of the plant, is almost completely used for the needs of the cogeneration plant and its units, which allows to achieve a total efficiency of at least 86%. The ability of the cogeneration plant to work on various types of solid waste gives a wide range of applications and operational capabilities.

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“…It should be noted that the simulation was carried out for stationary operation of the gas generator. During start-up and warm-up, the power consumption is naturally higher [35][36][37].…”

Section: Resultsmentioning

confidence: 99%

Efficiency of biomass and solid waste energy processing based on the cogeneration plant with plasma heat source

et al. 2019

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“…The operating principle of the TCPT is based on the evaporation of a working fluid at the heat source and the condensation of the resulting vapour at the heat sink 15 , 16 . One focus of optimisation currently is on improving the internal heat transfer on the condensation side of the TPCT 17 – 26 . In general, film condensation is predominant there.…”

Section: Introductionmentioning

confidence: 99%

Enhancing heat transfer at low temperatures by laser functionalization of the inner surface of metal pipes

Holder,

Peter,

Kirsch

et al. 2024

Sci Rep

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The latent heat transfer during vapour condensation in the condenser section of passive heat transport devices such as the two-phase closed thermosiphon is limited by film condensation. Dropwise condensation provides an increase of the heat transfer coefficient by up to one order of magnitude and can be achieved with a water-repellant surface. The inner surface of pipes made from stainless steel was functionalized by laser surface texturing with ultrashort laser pulses and subsequent storage in a liquid containing long-chained hydrocarbons. The pipes were separated into half-pipes by wire eroding to enable laser texturing of the inner surface, and were then joined by electron beam welding after laser texturing. As a result, superhydrophobic and water-repellent surfaces with a contact angle of 153° were obtained on the inner surface of the pipes with a length of up to 1 m. The functionalized pipes were used in the condenser section of a two-phase closed thermosiphon to demonstrate a heat transfer rate of 0.92 kW at 45 °C, which is approximately three times the heat transfer rate of 0.31 kW of a smooth reference pipe.

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“…The generalization of results of the boiling of the distilled water [1][2][3][4] for the microfinned surfaces ( Fig. 1 and Table 1) was made according to the model…”

Section: ÷210mentioning

confidence: 99%

“…This quantity was used as scale for the velocity of the fluid particles due to the vaporization processes. The generalization of the experimental results by the dimensionless factors like h/F/F0 has not been successful [2][3][4]. Therefore, the generalization was made by using the criterion Kг=f(h/l0,/l0,/l0,(s-u)/l0,), where as a linear scale was used the Laplace constant scale allows to define the type of type of the structure: cell or the capillary [5].…”

Section: ÷210mentioning

confidence: 99%

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Recommendations for the heat transfer assessment for natural convection boiling of microfinned surfaces

Gortyshov

Попов

Щелчков

et al. 2017

J. Phys.: Conf. Ser.

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Abstract. The paper presents the generalized correlations for the heat transfer coefficients for natural convection boiling of microfinned surfaces based on the experimental measurements. IntroductionThe microfinned surface elements on the flat horizontal plate produced by the deforming cutting method is one of the most effective ways of heat transfer intensification for natural convection boiling [1,2]. The deforming cutting method is a simple and no waste technology.It was revealed that for the two-and the three-dimensional microstructured surfaces for the element height of 90-750 µm, element thickness of 25-320 µm, and longitudinal gap width of 40-500 µm the heat transfer coefficients is growing up to a factor of 9, and the critical heat flux magnitudes are rising up to a factorof 4.1. The maximal values of the heat transfer intensification were observed for the three-dimensional surface elements. The results of studying the heat transfer enhancement for these surfaces for the boiling of the distilled water, 98%ethanol, and 60% water solution of the glycerin are presented in [3,4].

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Heat transfer enhancement and critical heat fluxes in boiling of microfinned surfaces

Cited by 37 publications

References 30 publications

Efficiency of biomass and solid waste energy processing based on the cogeneration plant with plasma heat source

Efficiency of biomass and solid waste energy processing based on the cogeneration plant with plasma heat source

Enhancing heat transfer at low temperatures by laser functionalization of the inner surface of metal pipes

Recommendations for the heat transfer assessment for natural convection boiling of microfinned surfaces

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