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Dust  explosions  are  dangerous  events  that  still  today  represent  a  risk  to  all  the \udindustries    that    produce    and/or    handle    combustible    dust    like    the    ag\udroalimentary, \udpharmaceutical and energy ones. When a dust cloud is dispersed in an oxidant gas, like air, it \udmay  reach  the  explosive  concentration  range.  A  model  to  predict  the  dust  critical  conditions, \udthat can cause explosions, is a key factor for safet\udy of operators and the security of the plants. \udThe key point to predict this dust resuspension is to measure the velocity vectors of dust under \udthe  accidental  conditions.  In  order  to  achieve  this  goal  the  authors  have  developed  an \udexperimental   facility,   ST\udARDUST\ud-\udU,   which   allow   to   obtain   different   conditions   of \udtemperature  and  pressurization  rates  characteristic  of  accidents  in  confined  environment.  The \udauthors   have   developed   also   optical   methods   and   software   to   analyse   different   dust \udresuspension phenomena \udunder different conditions in confined environment. In this paper, the \udauthor  will  present  how  they  measure  the  dust  velocity  vectors  in  different  experimental \udconditions  (and  for  different  type  of  dusts)  and  how  they  have  related  the  dust  characteristics \udand positions inside STARDUST\ud-\udU with the resuspension degree and the velocity values

journal of physics. conference series

Optical measures of dust velocities and direction during loss of vacuum accidents in confined environment and correlation between dust positions and properties with the resuspension degrees and the velocity modules