Assessment of heating and evaporation modelling based on single suspended water droplet experiments

Development of a novel two-zone model for the heating of an evaporating liquid droplet

“…The results were first compared to the experimental data obtained by Volkov and Strizhak [13] and [14]. It was found that the two-zone model did not improve the droplet lifetime, 𝑡 , predictions displayed in [15], compared to the isothermal model. In fact, the differences in the predictions of 𝑡 between the two models are marginal (less than 1%).…”

“…In [15] the effect of the sub-models for the Sherwood and the Nusselt numbers and the possible modifications to those sub-models to have a better agreement between simulations with the isothermal model and the experimental results obtained by Volkov and Strizhak was investigated. The effort in [15] was put on the saturation temperature and the droplet lifetime.…”

“…The setup of the computational tests is similar to the setup of the verification test case 'Ranz_Marshal_thermally_thick' 2 . The only modifications to this set-up are in the ambient conditions, in order to match the present case, and the flow field imposed, rather than solved (as done in [15]). The results mainly show that during the early stages of the heat-up and evaporation processes, the increase in surface temperature in the thermally thick model is better captured by the two-zone model than with the isothermal model.…”

A review on fire suppression by fire sprinklers

“…This study provides the understanding of the boiling behaviour associated with droplets impacting on hot solid surface during fire suppression. Similarly, a single suspended water droplet lifetime and droplet saturation rate was investigated by Beji et al 81 The study was conducted based on a previous experiment by Volkov et al 82 using a CFD code, FDS. Water droplet diameter of 2.6-3.4 mm and convective hot air flows at 100°C-800°C were varied according to the experimental setup.…”

Experimental Investigation of Water Droplet Phase Change in Humidi-fied Air Flow

“…For this, certain assumptions are made and empirical correlations describing the various transfer processes are applied. Therefore, in practice different theoretical models are used for droplet heat and mass transfer investigation and various methods of their solution are applied [11][12][13][14][15]. When modelling phase transition in a two phase flow, particular boundary conditions of the droplet transfer processes need to be considered.…”