Saw, W.Nathan, G.Ashman, P.Alwahabi, Z.Hupa, M.2010-07-062010-07-062010Combustion and Flame, 2010; 157(4):769-7770010-2180http://hdl.handle.net/2440/59302Simultaneous measurement of the concentration of released atomic sodium, swelling, surface and internal temperature of a burning black liquor droplet under a fuel lean and rich condition has been demonstrated. Two-dimensional two-colour optical pyrometry was employed to determine the distribution of surface temperature and swelling of a burning black liquor droplet while planar laser-induced fluorescence (PLIF) was used to assess the temporal release of atomic sodium. The key findings of these studies are: (i) the concentration of atomic sodium released during the drying and devolatilisation stages was found to be correlated with the external surface area; and (ii) the insignificant presence of atomic sodium during the char consumption stage shows that sodium release is suppressed by the lower temperature and by the high CO<inf>2</inf> content in and around the particle. © 2009 The Combustion Institute.enCopyright 2009 The Combustion Institute. Published by Elsevier Inc. All rights reserved.Black liquorSurface temperatureSodiumLIFJournal article002009515910.1016/j.combustflame.2009.12.0160002754845000132-s2.0-7694909202135926Saw, W. [0000-0002-2538-5811]Nathan, G. [0000-0002-6922-848X]Ashman, P. [0000-0003-1876-4546]Alwahabi, Z. [0000-0003-4831-7798]