A systematic experimental study on the evaporation rate of supercooled water droplets at subzero temperatures and varying relative humidity

Ruberto, S.; Reutzsch, Jonathan; Roth, N.

doi:10.1007/s00348-017-2339-5

Cited by 13 publications

(12 citation statements)

References 19 publications

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“…This finding is highlighted with the dashed lines, showing the linear regression under the assumption that there is no evaporation for fully saturated air, so β = 0 for ϕ = 100%. Such linear behavior has been found for all evaluated simulations, as it has also been found experimentally and numerically in [19] for supercooled droplets. The present results show that the magnitude of the evaporation rate increases with increasing droplet diameter, slip velocity, and temperature level.…”

Section: Discussionsupporting

confidence: 84%

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Evaporation Modeling of Water Droplets in a Transonic Compressor Cascade under Fogging Conditions

Seck

Geist

Harbeck

et al. 2020

IJTPP

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High-fogging is widely used to rapidly increase the power outputs of stationary gas turbines. Therefore, water droplets are injected into the inflow air, and a considerable number enter the compressor. Within this paper, the primary process of droplet evaporation is investigated closely. A short discussion about the influential parameters ascribes a major significance to the slip velocity between ambient gas flow and droplets. Hence, experimental results from a transonic compressor cascade are shown to evaluate the conditions in real high-fogging applications. The measured parameter range is used for direct numerical simulations to extract evaporation rates depending on inflow conditions and relative humidity of the air flow. Finally, an applicable correlation for the Sherwood number in the form of S h ( R e 1 / 2 S c 1 / 3 ) is suggested.

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Section: Discussionsupporting

confidence: 84%

“…The method was used and validated extensively in past years. For more details, the reader is referred to [18,19].…”

Section: Numerical Methods and Setupmentioning

confidence: 99%

Evaporation Modeling of Water Droplets in a Transonic Compressor Cascade under Fogging Conditions

Seck

Geist

Harbeck

et al. 2020

IJTPP

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“…The authors observed in their experiment a linear relation between the evaporation rate and the relative humidity. Ruberto et al [6] extended their previous work and carried out a similar experimental study, but now comparing it to the numerical solution of a proposed theoretical model. The numerical computations were performed with the in-house Free Surface Code (FS3D), which is a DNS simulator based on the volume of fluid (VOF) method to solve the incompressible Navier-Stokes equations.…”

Section: Introductionmentioning

confidence: 93%

“…In this sense, the mathematical modeling of the freezing mechanism is particularly useful for proper design and satisfactory performance of "icephobic" surface modifications for aeronautical sensors and components [1][2][3]. Freezing of supercooled droplets, either suspended (or flowing) in a gaseous environment or brought in contact with a cold substrate, has been studied before, and some of these previous works are here reviewed [4][5][6][7][8][9][10][11][12][13]. The freezing process of a supercooled droplet can be described in four distinct stages.…”

Section: Introductionmentioning

confidence: 99%

An improved lumped model for freezing of a freely suspended supercooled water droplet in air stream

et al. 2021

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This work deals with the mathematical modeling of the transient freezing process of a supercooled water droplet in a cold air stream. The aim is to develop a simple yet accurate lumped-differential model for the energy balance for a freely suspended water droplet undergoing solidification, that allows for cost effective computations of the temperatures and freezing front evolution along the whole process. The complete freezing process was described by four distinct stages, namely, supercooling, recalescence, solidification, and cooling. At each stage, the Coupled Integral Equations Approach (CIEA) is employed, which reduces the partial differential equation for the temperature distribution within the spherical droplet into coupled ordinary differential equations for dimensionless boundary temperatures and the moving interface position. The resulting lumped-differential model is expected to offer improved accuracy with respect to the classical lumped system analysis, since boundary conditions are accounted for in the averaging process through Hermite approximations for integrals. The results of the CIEA were verified using a recently advanced accurate hybrid numerical-analytical solution through the Generalized Integral Transform Technique (GITT), for the full partial differential formulation, and comparisons with numerical and experimental results from the literature. After verification and validation of the proposed model, a parametric analysis is implemented, for different conditions of airflow velocity and droplet radius, which lead to variations in the Biot numbers that allow to inspect for their influence on the accuracy of the improved lumped-differential formulation.

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“…On the one hand, physically consistent numerical models, capable of calculating all three phase transitions, were developed [43,45]. On the other hand, the numerical work within the program FS3D was validated and compared with different experimental results [44,47]. In an optical levitator, the dynamics of supercooled water droplets was investigated by light scattering and shadowgraphy methods for ambient conditions corresponding to temperatures appearing in clouds at high altitudes.…”

Section: Phase Transition Of Supercooled Dropletsmentioning

confidence: 99%

Collaborative Research on Droplet Dynamics Under Extreme Ambient Conditions

Schulte

Dreizler

Munz

et al. 2022

Fluid Mechanics and Its Applications

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A fundamental understanding of droplet dynamics is important for the prediction and optimization of technical systems involving drops and sprays. The Collaborative Research Center (CRC) SFB-TRR 75 was established in January 2010 to focus on the dynamics of basic drop processes, and in particular on processes involving extreme ambient conditions, for example near thermodynamic critical conditions, at very low temperatures, under the influence of strong electric fields, or in situations involving extreme gradients of the boundary conditions. The goal of the CRC was to gain a profound physical understanding of the essential processes, which is the basis for new analytical and numerical descriptions as well as for improved predictive capabilities. This joint initiative involved scientists at the University of Stuttgart, the TU Darmstadt, the TU Berlin, and the German Aerospace Center (DLR) in Lampoldshausen. This first chapter provides a brief overview of the overall structure of this CRC as well as a summary of some selected scientific achievements of the subprojects involved. For further details the reader is referred to the subsequent chapters of this book related to the individual subprojects.

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A systematic experimental study on the evaporation rate of supercooled water droplets at subzero temperatures and varying relative humidity

Cited by 13 publications

References 19 publications

Evaporation Modeling of Water Droplets in a Transonic Compressor Cascade under Fogging Conditions

Evaporation Modeling of Water Droplets in a Transonic Compressor Cascade under Fogging Conditions

An improved lumped model for freezing of a freely suspended supercooled water droplet in air stream

Collaborative Research on Droplet Dynamics Under Extreme Ambient Conditions

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