Simultaneous, noninvasive measurements of convective heat transfer and solid volume fraction at the wall of an entrained gas-solid suspension
- Sibley School of Mechanical and Aerospace Engineering, Cornell University, Ithaca, New York 14853 (United States)
We describe an instrument for local, instantaneous, noninvasive, simultaneous measurements of solid volume fraction and convective heat transfer at the wall of a vertical tube containing a relatively dense, entrained suspension of gas and fine solids. The instrument combines a small platinum coil and a guarded capacitance sensor. The capacitance sensor records instantaneous solid volume fraction in the near vicinity of the wall. The coil is maintained at constant temperature by a rapid anemometer bridge circuit. The vessel is wrapped in electric heaters to avoid artificially high rates associated with developing heat transfer and to minimize conduction losses from the coil. Using a model capturing these losses, convective heat transfer rates are inferred from the power input to the coil. The instrument is tested in a cold circulating fluidized bed riser. The temporal response of the thermal sensor is faster than 30 ms. (c) 2000 American Institute of Physics.
- OSTI ID:
- 20217156
- Journal Information:
- Review of Scientific Instruments, Vol. 71, Issue 7; Other Information: PBD: Jul 2000; ISSN 0034-6748
- Country of Publication:
- United States
- Language:
- English
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