Figure 4: Thermal constraints on particle behaviour at high temperatures.
From: Volcanic ash melting under conditions relevant to ash turbine interactions
The range of values of ST, DT, HT and FT of nine volcanic ash samples are represented in this box-and-whisker plot, together with those of the two standard dusts and one standard sand. The lower and upper sides of each box indicate the 25th and 75th percentiles, respectively. Inside the boxes, the solid lines indicate the median and the orange squares indicate the mean of the characteristic temperatures of the nine volcanic ash samples. Outside the boxes, small tick marks indicate minimum and maximum values. Note that some of the characteristic temperatures of sand and dust exceed the operational limit of our heating microscope (1,650 °C), yet these clearly supersede the low-temperature range of sticking ability of volcanic ash.
