thanks Claus for the material, really appreciate that.
however can i predict, how much velocity steam need to be added for a given feedrate..
Mass flow can be easily calculated,but it will not consider steam flow inside the tube as well.
i would assume that the steam will flow in annular pattern, where steam will flowing in the middle(core) of the tube, where vacuum residue will cripplingly flow at the tube wall.
For your info, our furnace mass flow is around 230 lb/ft2.s , we are planning to increase our mass flow to 300 lb/ft2.s, quite hard to predict how much velocity steam is needed.unless there is already a correlation between the steam flow needed vs vacuum residue rate.
Nice to discuss with you…