Combined wall-to-fluidized bed heat transfer. Bubbles and emulsion contributions at high temperature

摘要: Abstract A theoretical and experimental investigation of combined wall-to-fluidized bed heat transfer is presented. Bubble emulsion contributions are modelled assuming both phases to be semi-transparent grey media. For a radiant bubble phase component the general situation absorbing gases including particulate described. Tests were performed with two-dimensional fluidized column in temperature range 500–900°C. Experimental results emphasized that (i) non-linear relation exists between h Tb if conduction-to-radiation parameter (N) smaller than 5, indicating radiative conductive not independent, (ii) dense contribution becomes significant at temperatures higher 700°C, (iii) 900°C cannot neglected.