1977 Volume 3 Issue 3 Pages 266-271
An electronic system called “Hot-Wire Scope” has been developed for measurement of bubbles in a three-dimensional fluidized bed.
The probe is an assembly of seven long nichrome fine wires that are evenly spaced by one centimeter span horizontally. Soldering a copper lead on the fine wires at every centimeter, the multi-channel hot-wires are formed.
Neon lamps corresponding to each hot-wire through an electronic circuit, form a lamp matrix. When a bubble passes the hot-wires, lamps repeat lighting and the lamp matrix shows a horizontally sliced bubble pattern in a mosaic form.
The horizontal bubble diameter is thus determined by cinematographing the pattern. A few examples are presented in this paper.
