Peculiarities of the transit phase transformation regime for water droplets that are slipping in humid gas

Miliauskas, Gintautas; Maziukienė, M.; Ramanauskas, V.

doi:10.1016/j.ijheatmasstransfer.2016.06.008

Cited by 7 publications

(4 citation statements)

References 58 publications

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“…3 shows distribution of calculated averaged heat fluxes densities on the surface of the experimental droplet in the pre-heated and additional humidified air flow (experiment 6). This dynamic of energy flows is in good agreement with the typical results of numerical calculations of heat and mass transfer of the water droplet [38][39][40].…”

Section: Resultssupporting

confidence: 88%

Averaged Heat Fluxes Densities During Condensation and Evaporation of a Water Droplet

BIKNIENĖ,

PAUKŠTAITIS

2024

mech

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This study is intended for experimental investigation of the influence of boundary conditions on the intensity of phase transformations and heat transfer processes in a suspended water droplet. The results of the dynamics of the averaged heat fluxes densities during the droplet phase change cycle are presented and analysed. The influence of the droplet initial temperature, the surrounding air flow temperature and the additional humidity in the air flow were defined in separate regimes of the droplet phase transformations cycle. The experiments performed demonstrated that the parameters of the air flow surrounding the suspended water droplet affect the intensity of heat fluxes in the droplet throughout whole its phase change cycle. It was experimentally claimed that the initial temperature of the water droplet has no influence on the droplet heat and mass transfer processes in the equilibrium evaporation regime. The obtained results showed that most intensity heat flux densities are at the beginning of the droplet phase change cycle when condensation process occurs on the droplet’s surface in case with biggest amount of additional humidity in the surrounding air flow. This is very important in technologies of cleaning and heat recovery from flue gases.

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Section: Resultssupporting

confidence: 88%

Averaged Heat Fluxes Densities During Condensation and Evaporation of a Water Droplet

BIKNIENĖ,

PAUKŠTAITIS

2024

mech

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“…Therefore, the influence of the Stefan flow in the transitional evaporation regime is weaker compared to the equilibrium evaporation regime. It is demonstrated by decreased values of calculated B T and B M numbers, but these numbers still remain positive [8,34,45], which is also considered in our research. Another important aspect of the research is that the Spalding B T and B M numbers are adapted also to the droplet's condensation regime.…”

Section: Resultssupporting

confidence: 77%

“…The parameter of effective thermal conductivity and velocity of a droplet are described based on the empirical model [34,45,46]: ;…”

Section: Methodsmentioning

confidence: 99%

The Influence of Droplet Dispersity on Droplet Vaporization in the High-Temperature Wet Gas Flow in the Case of Combined Heating

et al. 2021

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The change in the thermal and energy state of the water droplet is defined numerically. The influence of droplet dispersity on the interaction of the transfer processes was evaluated. In influence of the Stefan flow was considered as well. The internal heat transfer of the droplet was defined by the combined heat transfer through effective conductivity and radiation model. The results of the numerical modeling of heat and mass transfer in water droplets in a wet flue gas flow of 1000 °C highlight the influence of the variation in heat transfer regimes in the droplet on the interaction of the transfer processes in consistently varying phase change regimes. The results of the investigation shows that the inner heat convection diminishes intensively in the transitional phase change regime because of a rapid slowdown of the slipping droplet in the gas. The radiation absorption in the droplet clearly decreases only at the final stage of equilibrium evaporation. The highlighted regularities of the interaction between combined transfer processes in water droplets are also valid for liquid fuel and other semi-transparent liquids sprayed into high-temperature flue gas flow. However, a qualitative evaluation should consider individual influence of dispersity that different liquids have.

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“…Vandens išpurškimo procesas yra labai svarbus utilizuojant šilumą iš šalinamų biokuro dūmų ir kartu sprendžiant aplinkosaugines problemas, susijusias su šiluminio užterštuno mažinimu ir gamtos užteršimu kietosiomis dalelėmis ir cheminiais junginiais. Plėtojant ekonomiškai darnias biokuro degimo technologijas, ne tik gerinami ekonominiai katilinių našumo rodikliai, bet ir mažinamas aplinkos šiluminis ir cheminis užterštumas (Miliauskas et al 2016). Siekiant išvengti aplinkos užterštumo kietosiomis dalelėmis bei įvairiais oksidais, labai svarbiu procesu tampa dūmų valymas vandeniu disperguotu pavidalu.…”

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Drėgnose Dujose Šylančių Vandens Lašelių Šilumos Ir Masės Mainai Pereinamųjų Fazinių Virsmų Režime

Maziukienė¹,

Miliauskas²

2017

Proceedings of the 20th Conference for Junior Researchers „Science – Future of Lithuania“

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Įvairiai technologinei praktikai svarbus lašelių šilumos ir masės mainų pažinimas. Darbe skaitiškai sumodeliuotas skirtingo dispersiškumo vandens lašelių šilimas ir faziniai virsmai drėgname ore. Išskirtinis dėmesys skirtas kondensaciniam ir pereinamojo garavimo režimams. Lašelių temperatūros kitimas apibrėžtas pagal iteracinę skaitinę schemą, kuri grįsta prie lašelio paviršiaus pritekančių ir nutekančių šilumos srautų balansu. Atsižvelgta į pernašos procesų tarpusavio sąveiką. Lašelių fazinių virsmų režimus apibrėžiančiais parametrais įvardyta išpurškiamojo vandens temperatūra, oro temperatūra ir drėgnumas bei lašelių šildymo procesas. Įvertinta jų įtaka lašelių energinei būsenai bei faziniams virsmams.

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Peculiarities of the transit phase transformation regime for water droplets that are slipping in humid gas

Cited by 7 publications

References 58 publications

Averaged Heat Fluxes Densities During Condensation and Evaporation of a Water Droplet

Averaged Heat Fluxes Densities During Condensation and Evaporation of a Water Droplet

The Influence of Droplet Dispersity on Droplet Vaporization in the High-Temperature Wet Gas Flow in the Case of Combined Heating

Drėgnose Dujose Šylančių Vandens Lašelių Šilumos Ir Masės Mainai Pereinamųjų Fazinių Virsmų Režime

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