scholarly journals Experimental study of liquid evaporation rate from coniferous biomass

2017 ◽  
Vol 110 ◽  
pp. 01020 ◽  
Author(s):  
E.E. Bulba ◽  
N.A. Ivanova
Keyword(s):  
Experimental Study ◽  
Evaporation Rate ◽  
Liquid Evaporation

scholarly journals An experimental study of the evaporation rate of nanofluid droplets with SiO2 nanoparticles

2020 ◽  
Vol 1675 ◽  
pp. 012046
Author(s):  
E M Bochkareva ◽  
N B Miskiv ◽  
A D Nazarov ◽  
V V Terekhov ◽  
V I Terekhov
Keyword(s):  
Experimental Study ◽  
Evaporation Rate ◽  
Sio2 Nanoparticles

scholarly journals Study of non-isothermal liquid evaporation in synthetic micro-pore structures with hybrid lattice Boltzmann model

2019 ◽  
Vol 866 ◽  
pp. 33-60 ◽  
Author(s):  
Feifei Qin ◽  
Luca Del Carro ◽  
Ali Mazloomi Moqaddam ◽  
Qinjun Kang ◽  
Thomas Brunschwiler ◽  
...  
Keyword(s):  
Lattice Boltzmann ◽  
Evaporation Rate ◽  
Experimental Studies ◽  
Liquid Films ◽  
Lattice Boltzmann Model ◽  
Layer By Layer ◽  
Pore Structures ◽  
Liquid Evaporation ◽  
Cooling Effects ◽  
Boltzmann Model

Non-isothermal liquid evaporation in micro-pore structures is studied experimentally and numerically using the lattice Boltzmann method. A hybrid thermal entropic multiple-relaxation-time multiphase lattice Boltzmann model (T-EMRT-MP LBM) is implemented and validated with experiments of droplet evaporation on a heated hydrophobic substrate. Then liquid evaporation is investigated in two specific pore structures, i.e. spiral-shaped and gradient-shaped micro-pillar cavities, referred to as SMS and GMS, respectively. In SMS, the liquid receding front follows the spiral pattern; while in GMS, the receding front moves layer by layer from the pillar rows with large pitch to the rows with small one. Both simulations agree well with experiments. Moreover, evaporative cooling effects in liquid and vapour are observed and explained with simulation results. Quantitatively, in both SMS and GMS, the change of liquid mass with time coincides with experimental measurements. The evaporation rate generally decreases slightly with time mainly because of the reduction of liquid–vapour interface. Isolated liquid films in SMS increase the evaporation rate temporarily resulting in local peaks in evaporation rate. Reynolds and capillary numbers show that the liquid internal flow is laminar and that the capillary forces are dominant resulting in menisci pinned to the pillars. Similar Péclet number is found in simulations and experiments, indicating a diffusive type of heat, liquid and vapour transport. Our numerical and experimental studies indicate a method for controlling liquid evaporation paths in micro-pore structures and maintaining high evaporation rate by specific geometry designs.

scholarly journals The effect of thermal treatment on ac/dc conductivity and current fluctuations of PVDF/NMP/[EMIM][TFSI] solid polymer electrolyte

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Petr Sedlak ◽  
Adam Gajdos ◽  
Robert Macku ◽  
Jiri Majzner ◽  
Vladimir Holcman ◽  
...  
Keyword(s):  
Experimental Study ◽  
Ionic Liquid ◽  
Thermal Treatment ◽  
Polymer Electrolyte ◽  
Polymer Matrix ◽  
Shot Noise ◽  
Solid Polymer Electrolyte ◽  
Evaporation Rate ◽  
Solid Polymer ◽  
Current Fluctuations

AbstractThe experimental study deals with the investigation of the effect of diverse crystallinity of imidazolium ionic-liquid-based SPE on conductivity and current fluctuations. The experimental study was carried out on samples consisting of [EMIM][TFSI] as ionic liquid, PVDF as a polymer matrix and NMP as a solvent. After the deposition, the particular sample was kept at an appropriate temperature for a specific time in order to achieve different crystalline forms of the polymer in the solvent, since the solvent evaporation rate controls crystallization. The ac/dc conductivities of SPEs were investigated across a range of temperatures using broadband dielectric spectroscopy in terms of electrical conductivity. In SPE samples of the higher solvent evaporation rate, the real parts of conductivity spectra exhibit a sharper transition during sample cooling and an increase of overall conductivity, which is implied by a growing fraction of the amorphous phase in the polymer matrix in which the ionic liquid is immobilized. The conductivity master curves illustrate that the changing of SPEs morphology is reflected in the low frequency regions governed by the electrode polarization effect. The dc conductivity of SPEs exhibits Vogel–Fulcher–Tammann temperature dependence and increases with the intensity of thermal treatment. Spectral densities of current fluctuations showed that flicker noise, thermal noise and shot noise seems to be major noise sources in all samples. The increase of electrolyte conductivity causes a decrease in bulk resistance and partially a decrease in charge transfer resistance, while also resulting in an increase in shot noise. However, the change of electrode material results in a more significant change of spectral density of current fluctuations than the modification of the preparation condition of the solid polymer electrolyte. Thus, the contact noise is considered to contribute to overall current fluctuations across the samples.

scholarly journals Особенности испарения капли при лучистом и конвективном нагреве

2020 ◽  
Vol 46 (8) ◽  
pp. 25
Author(s):  
В.А. Архипов ◽  
С.А. Басалаев ◽  
Н.Н. Золоторёв ◽  
К.Г. Перфильева ◽  
А.С. Усанина
Keyword(s):  
Experimental Study ◽  
Heat Flux ◽  
Comparative Analysis ◽  
Evaporation Rate ◽  
Water Drop ◽  
Radiant Heat ◽  
Convective Heating ◽  
Distilled Water ◽  
Radiant Heat Flux ◽  
Convective Heat Flux

New method for determining the evaporation rate of single levitating drop at radiant heat flux has been proposed. The results of experimental study of the evaporation rate of distilled water drop upon heating by radiant and convective heat flux in the range of q = (0.25–1.5) W/cm^2 are presented. Comparative analysis of the features of the drop evaporation during radiant and convective heating has been carried out.

scholarly journals Experimental study of liquid evaporation from a surface of gel mixture

2019 ◽  
Vol 196 ◽  
pp. 00030
Author(s):  
Andrey Vyazmin ◽  
Dmitry Khramtsov ◽  
Boris Pokusaev ◽  
Dmitry Nekrasov ◽  
Nikolay Zakharov
Keyword(s):  
Experimental Study ◽  
Linear Dependency ◽  
Non Linear ◽  
Liquid Evaporation

Experimental study of liquid evaporation from gel mixture surface was performed. Gels based on agarose and starch were studied. Dependencies of liquid evaporation from time were obtained for mixtures of agarose and starch. A non-linear dependency of evaporation speed was observed for all sets of mixtures. It was shown that presence of starch inhibits the process of liquid evaporation.

New results on the dependence of the liquid evaporation rate on the pressure of its vapour

1980 ◽  
Vol 38 (1) ◽  
pp. 67-73 ◽  
Author(s):  
G. Bertrand ◽  
M. Lallemant ◽  
A. Mokhlisse ◽  
N. Roudergues
Keyword(s):  
Evaporation Rate ◽  
Liquid Evaporation

Modeling of Sessile Droplet Evaporation on Engineered Surfaces

2019 ◽  
Vol 11 (6) ◽  
Author(s):  
Jyoti Prakash ◽  
Basant Singh Sikarwar
Keyword(s):  
Experimental Study ◽  
Relative Humidity ◽  
Evaporation Rate ◽  
Sessile Drop ◽  
Droplet Evaporation ◽  
Contact Angles ◽  
Surface Wettability ◽  
Aluminum Surface ◽  
Complex Nature ◽  
Wide Range

The evaporation of sessile drop has a wide range of application that includes printing, washing, cooling, and coating. Due to the complex nature of drop evaporation process, this phenomenon is reliant on several parameters such as ambiance and physiochemical properties of liquid and surface. In the present study, a mathematical model of water droplet evaporation on an engineered aluminum surface is developed. Experimental study is carried out for the validation of code. The data obtained from the simulation is validated against the data obtained from an experimental study as well as the data available in the literature and good agreement was found among them. Post-validation, the effect of surface wettability and environment conditions on a droplet evaporation rate is estimated. It is inferred from the outcomes that the temperature at the apex of the drop varies linearly with the increasing relative humidity. Droplet volume has a significant impact on the evaporation rate and comparatively higher evaporative flux for a smaller volume of the drop with large contact angles. This unveils the possibility of achieving the required evaporation rate by controlling surface wettability and relative humidity conditions near the drop.

Determination of the liquid evaporation rate when categorizing rooms and outdoor installations

2020 ◽  
pp. 120-129
Author(s):  
Геннадий Тимофеевич Земский ◽  
Владимир Александрович Зуйков ◽  
Александр Валерьевич Ильичев ◽  
Наталья Валентиновна Кондратюк ◽  
Александр Владимирович Зуйков
Keyword(s):  
Evaporation Rate ◽  
Saturated Vapor ◽  
State Diagram ◽  
Critical Parameters ◽  
Normative Documents ◽  
Ambient Temperatures ◽  
Wide Range ◽  
Evaporation Intensity ◽  
Liquid Evaporation

Возможность взрыва паровоздушной смеси при аварийном проливе жидкости из технологического аппарата во многом зависит от интенсивности испарения жидкости. Для определения интенсивности испарения существуют уравнения, в которые входят величины, характеризующие свойства жидкости, условия ее нахождения в аппарате перед аварией и условия, в которые попадает выливающаяся жидкость. Критически рассмотрены известные уравнения для определения интенсивности испарения, начиная от уравнения Ленгмюра - Кнудсена и заканчивая уравнениями, вошедшими в нормативные документы по обеспечению пожарной безопасности. Рассмотрены варианты аварийного пролива пожароопасных жидкостей в зависимости от сочетания следующих температур: температуры кипения жидкости, температуры вспышки жидкости, температуры жидкости до пролива и температуры окружающей среды. The possibility of an explosion of a steam-air mixture in the event of an emergency spillage of liquid from the process apparatus largely depends on the liquid evaporation intensity. The evaporation intensity is influenced by the following factors: the properties of the liquid (such as critical parameters, liquid temperature, saturated vapor pressure, flash point) as well as the temperature and pressure of the surrounding atmosphere. To determine the intensity of evaporation there are equations that include values that characterize the properties of the liquid, the conditions of its presence in the device before the accident, and the conditions for the spilling liquid after the accident. There is critically considered the wide range of known equations for determining the evaporation intensity beginning with the Langmuir-Knudsen equation and ending with the equations included in the normative documents on fire safety. The Langmuir-Knudsen equation is valid when liquid evaporation occurs in vacuum. When liquid vaporizes in real conditions it is necessary to take into account the non-isothermic nature of the process and the diffusion of vapors into the atmosphere, as well as the possible entrainment of vapors by convective air flows. After the appropriate corrections as a result of special tests there was obtained the equation for determining the evaporation rate. Variants of emergency spillage of fire-hazardous liquids are considered depending on a combination of the following temperatures: the boiling temperature of the liquid, the flash temperature of the liquid, the temperature of the liquid before the spill and the ambient temperature. Equations for calculating the evaporation intensity are defined for every variant. There is carried out correlation of the variants with liquid evaporation during emergency spill with the classification of liquids according to the state diagram in relation to the range of ambient temperatures according to Marshall.

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