Determination of Thermodynamic Parameters from Evaporation of Binary Microdroplets of Volatile Constituents

Devarakonda, Venkat; Ray, A.

doi:10.1006/jcis.1999.6580

Cited by 23 publications

(22 citation statements)

References 16 publications

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“…104 An approach related to the phase function is to record the resonance spectrum, the intensity of elastically scattered light intensity recorded at a fixed angle over time. [105][106][107][108][109] A micronsized spherical droplet acts as a very high-quality optical cavity with the cavity modes being referred to as morphology dependent resonances or whispering gallery modes (WGMs). 110,111 When the droplet size is resonant with a WGM at the wavelength of the laser, the intensity of the scattered light increases markedly with scattering at WGM wavelengths being isotropic.…”

Section: Iib Characterising Single Particlesmentioning

confidence: 99%

Exploring the complexity of aerosol particle properties and processes using single particle techniques

2012

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The complex interplay of processes that govern the size, composition, phase and morphology of aerosol particles in the atmosphere is challenging to understand and model. Measurements on single aerosol particles (2 to 100 μm in diameter) held in electrodynamic, optical and acoustic traps or deposited on a surface can allow the individual processes to be studied in isolation under controlled laboratory conditions. In particular, measurements can now be made of particle size with unprecedented accuracy (sub-nanometre) and over a wide range of timescales (spanning from milliseconds to many days). The physical state of a particle can be unambiguously identified and its composition and phase can be resolved with a high degree of spatial resolution. In this review, we describe the advances made in our understanding of aerosol properties and processes from measurements made of phase behaviour, hygroscopic growth, morphology, vapour pressure and the kinetics of water transport for single particles. We also show that studies of the oxidative aging of single particles, although limited in number, can allow the interplay of these properties to be investigated. We conclude by considering the contributions that single particle measurements can continue to make to our understanding of the properties and processes occurring in atmospheric aerosol.

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Section: Iib Characterising Single Particlesmentioning

confidence: 99%

Exploring the complexity of aerosol particle properties and processes using single particle techniques

2012

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“…where Re is the Reynolds number, V g is the gas flow velocity, ν g is kinematic viscosity of gas, and Sc is the Schmidt number. This correction is the same as used by previous researchers (Davies et al, ; Devarakonda & Ray, ; Hopkins & Reid, ).…”

Section: Modeling Evaporation Kinetics Of a Single‐component Dropletmentioning

confidence: 99%

Evaporation Kinetics of Polyol Droplets: Determination of Evaporation Coefficients and Diffusion Constants

Marsh

Haddrell

et al. 2017

JGR Atmospheres

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In order to quantify the kinetics of mass transfer between the gas and condensed phases in aerosol, physicochemical properties of the gas and condensed phases and kinetic parameters (mass/thermal accommodation coefficients) are crucial for estimating mass fluxes over a wide size range from the free molecule to continuum regimes. In this study, we report measurements of the evaporation kinetics of droplets of 1‐butanol, ethylene glycol (EG), diethylene glycol (DEG), and glycerol under well‐controlled conditions (gas flow rates and temperature) using the previously developed cylindrical electrode electrodynamic balance technique. Measurements are compared with a model that captures the heat and mass transfer occurring at the evaporating droplet surface. The aim of these measurements is to clarify the discrepancy in the reported values of mass accommodation coefficient (αM, equals to evaporation coefficient based on microscopic reversibility) for 1‐butanol, EG, and DEG and improve the accuracy of the value of the diffusion coefficient for glycerol in gaseous nitrogen. The uncertainties in the thermophysical and experimental parameters are carefully assessed, the literature values of the vapor pressures of these components are evaluated, and the plausible ranges of the evaporation coefficients for 1‐butanol, EG, and DEG as well as uncertainty in diffusion coefficient for glycerol are reported. Results show that αM should be greater than 0.4, 0.2, and 0.4 for EG, DEG, and 1‐butanol, respectively. The refined values are helpful for accurate prediction of the evaporation/condensation rates.

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“…(10) takes the following simple form: (11) where is the specific isobaric heat capacity of the passive gas. According to this approxi mation, is found from the following equation:…”

Section: R T N R T H T R T N R T Dtmentioning

confidence: 99%

“…The effect of the cooling of such particles during evaporation may be used for the formation of nanoparticles with controlled sizes, shapes, and compositions [8]. Levitating multicompo nent droplets serve as detectors in instruments designed for measuring coefficients of diffusion and thermal conductivity in gaseous mixtures [9][10][11]. Finally, new combined optical procedures are, at present, under intense development for contact free monitoring of time variations in the temperature and chemical composition of small droplets [12].…”

Section: Introductionmentioning

confidence: 98%

On the evolution of a multicomponent droplet during nonisothermal diffusion growth or evaporation

et al. 2014

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A set of equations has been derived for the size, composition, and temperature of a multicompo nent droplet of a nonideal solution during its diffusion nonisothermal condensation growth or evaporation in a multicomponent mixture of vapors with an incondensable carrier gas. In addition to complete equations for material and heat transfer in the vapor-gas medium surrounding the droplet, the derived set, in the general case, describes the nonstationary growth or evaporation of the droplet under arbitrary initial conditions (ini tial size and temperature of the droplet and the concentrations of the nonideal multicomponent solution in it) and the establishment of the stationary values of the composition, temperature, and the rate of variations in the size of the droplet with allowance for heat effects and diffusion and thermodiffusion material transfer, Stefan flux, motion of the droplet surface, and the nonideality of the solution in the droplet. A simplified set of equations obtained without taking into account the contributions from the flow, cross effects, and thermal expansion in the equations of the material and heat transfer in the vapor gas medium has been considered. Equations describing growth/evaporation in the stationary regime have been analyzed for droplets of ideal multicomponent solutions.

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Determination of Thermodynamic Parameters from Evaporation of Binary Microdroplets of Volatile Constituents

Cited by 23 publications

References 16 publications

Exploring the complexity of aerosol particle properties and processes using single particle techniques

Exploring the complexity of aerosol particle properties and processes using single particle techniques

Evaporation Kinetics of Polyol Droplets: Determination of Evaporation Coefficients and Diffusion Constants

On the evolution of a multicomponent droplet during nonisothermal diffusion growth or evaporation

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