%0 Journal Article
%@ 00162361
%A Antonov, D.V.
%A Strizhak, P.A.
%A Fedorenko, R.M.
%A Nissar, Z.
%A Sazhin, S.S.
%D 2021
%F scholars:15077
%I Elsevier Ltd
%J Fuel
%K Bituminous coal; Drops; High speed cameras; Thermocouples; Video recording, Boiling temperature; Data collection; Experimental investigations; Micro explosion; Micro particles; National Instruments; Nucleation temperature; Spherical fuels, Phase interfaces
%R 10.1016/j.fuel.2020.119814
%T Puffing/micro-explosion in rapeseed oil/water droplets: The effects of coal micro-particles in water
%U https://khub.utp.edu.my/scholars/15077/
%V 289
%X The paper is focused on detailed experimental investigation of puffing and micro-explosions in composite water/rapeseed oil droplets in the presence of lignite and bituminous coal micro-particles in water. Gas temperature was measured using a high speed National Instruments 9219 for data collection and an S-type thermocouple. Video recording of droplet micro-explosions was performed using a Phantom Miro M310 high-speed camera. Droplets with radii in the range 1�2 mm were placed in a hot chamber with air velocities 3�7 m/s and temperatures up to 600 °C. The time to puffing/micro-explosion and average radii of child droplets generated during puffing and micro-explosions are shown to decrease with increasing gas temperature. The presence of bituminous coal led to a visible decrease in these radii. The observed times to puffing/micro-explosion were interpreted in terms of the recently developed model of the phenomenon based on the assumption that a single spherical water sub-droplet is located in the centre of a spherical fuel droplet. The time to puffing/micro-explosion in this model is associated with the time instant when the temperature at the water/fuel interface reaches the water nucleation temperature. The model predicts a decrease in time to puffing/micro-explosion in agreement with experimental observations. The effect of coal particles on this time is shown to be weak in agreement with observations at gas temperatures above 300 °C. It is shown that the times to puffing predicted by the model are close to those predicted by a simpler model in which these times are identified with the time instants when the temperature at the water/fuel interface reaches the boiling temperature of water. © 2020 Elsevier Ltd
%Z cited By 27