An analysis of the droplet support fiber effect on the evaporation process

Chauveau, Christian; Birouk, Madjid; Halter, Fabien; Gökalp, İskender

doi:10.1016/j.ijheatmasstransfer.2018.09.029

Cited by 59 publications

(23 citation statements)

References 27 publications

(69 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We believe that the main reason behind this discrepancy is the nature of suspenders used in these studies. While the suspenders used by Musa et al and Furuhata et al were about 10 times the size of the ones used in the other two studies, Wei et al used a metallic suspender, having a higher thermal conductivity, as compared to the quartz suspender used by Wang et al Experiments, which investigated the effect of suspenders on evaporation rates of droplets, by Nomura et al, Somasundaram et al, Strizhak et al, Radhakrishnan et al, and Chauveau et al show that heat conduction through suspenders can significantly enhance the evaporation rate of droplets. This enhancement possibly explains the higher evaporation rates observed by the other three groups when compared with the evaporation rates reported by Wang et al Additionally, even though the air around the droplet was presumed to be stagnant in all four experiments, recent studies show that it is difficult to maintain a quiescent ambient even under normal atmospheric conditions.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the evaporation behavior of urea‐water‐solution droplets exposed to a hot air stream

2019

View full text Add to dashboard Cite

The behavior of droplets of urea-water-solution (UWS) evaporating under the influence of a hot stream of air was investigated experimentally, under temperatures ranging from 100 C to 400 C. The droplets were suspended on a glass microfiber to minimize the influence of heat conduction, through the fiber, on the evaporation rate of the droplet. The flow rate of air, under all experimental conditions, was measured and these data were used to estimate the average velocity of air around the droplet. Experiments were also conducted on droplets of pure water and the results were compared. The initial mass fraction of urea, in the solution, did not appear to have a significant effect on the evaporation constant, but it did affect a few essential aspects of the evaporation behavior. The evaporation of water droplets was in accordance with the d 2 law at all temperatures, whereas the evaporation of UWS droplets was ambient-temperature dependent.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental investigation of the evaporation behavior of urea‐water‐solution droplets exposed to a hot air stream

2019

View full text Add to dashboard Cite

show abstract

“…However, for high temperature cases, a linear behaviour is observed for ethanol evaporation with a higher droplet lifetime than the one computed with the Spalding model. Due to the experimental technique used in the measurements, it is expected to observe a lower evaporation constant since the droplet conserve its sphericity and the effects of heat conduction in the quartz fiber are limited; leading to the observation of higher evaporation times [14]. Noting that Pr and Sc numbers are constant in the Spalding model, the numerical results are still in good agreement with the experiments, especially at higher ambient temperatures.…”

Section: Resultsmentioning

confidence: 54%

Evaporation of a single ethanol droplet interacting with a premixed laminar CH4/air flame

Kaya

Renoux²,

Halter³

et al. 2021

ICLASS

Self Cite

View full text Add to dashboard Cite

Among all phenomena occurring in liquid-fueled combustion chambers, one basic process is the interaction of droplets with the flame. Therefore, it is essential to understand the dynamics of an individual droplet interaction with a flame front in order to analyze more complex flames. The aim of this study is to investigate the evaporation of a single ethanol droplet interacting with a premixed laminar CH4/air flame. In the experimental part of the study, the droplet was injected into the stagnation flame. The visualization of the flame front and the temporal monitoring of the droplet evaporation were performed using optical technics (PIV, PTV, ILIDS). In the numerical part of the study, single droplet evaporation under constant temperature and stagnant environment was studied with the Eulerian-Lagrangian approach using the YALES2 solver. The variations of the droplet and gas properties were computed under N2 atmosphere and under flame conditions. From the vaporization rate calculations, it is observed that there is a slight effect of flame stretch due to the change in the temperature profile. It is also observed that the flame temperature has a dominant effect on the evaporation rate rather than the burnt gas composition.

show abstract

“…Only a small discrepancy can be observed. Note that model validation with suspended droplet measurements is more challenging and requires special attention as the heat balance of the droplet is notably affected by the support fiber, resulting in an enhanced vaporization rate Wong 2001,2002;Chauveau et al 2019). Presently, no experimental data was used from this latter measurement type.…”

Section: Compliance With Ethical Standardsmentioning

confidence: 99%

A Two-Parameter Corresponding States Method for Calculating the Steady-State Evaporation Rate of C2–C9 n-Alkane Droplets in Air for Elevated Pressures and Temperatures

Csemány

Józsa

2021

Flow Turbulence Combust

View full text Add to dashboard Cite

Advanced gas turbine and internal combustion engine combustion chambers operate at highly elevated pressures and temperatures. Therefore, spray vaporization analysis cannot be limited to the atmospheric environment since evaporation strongly depends on ambient conditions. Presently, the effect of air pressure and temperature on droplet evaporation rate was investigated by using both a transient and a steady-state approach. A corresponding states model was derived for the steady-state evaporation rate for n-alkanes in the range of C2–C9 with an excellent fit quality and < 1% model uncertainty, considering the thermophysical data uncertainties. The model was tested for C1, C10, and C12 n-alkanes as well with low success. The ambient conditions were evaluated in terms of reduced pressures and temperatures, covering the range of 0.02–0.5 and 1.2–1.5, respectively. However, the applicability of the model was limited to reduced temperature of 1.3–1.5, as higher discrepancy was observed between the trends of the different n-alkanes at lower temperatures. Since the heat-up phase of practical sprays in combustion chambers is often short, the present model might significantly reduce the computational effort required for liquid evaporation calculations.

show abstract

An analysis of the droplet support fiber effect on the evaporation process

Cited by 59 publications

References 27 publications

Experimental investigation of the evaporation behavior of urea‐water‐solution droplets exposed to a hot air stream

Experimental investigation of the evaporation behavior of urea‐water‐solution droplets exposed to a hot air stream

Evaporation of a single ethanol droplet interacting with a premixed laminar CH4/air flame

A Two-Parameter Corresponding States Method for Calculating the Steady-State Evaporation Rate of C2–C9 n-Alkane Droplets in Air for Elevated Pressures and Temperatures

Contact Info

Product

Resources

About