Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10262699 | Chemical Engineering Science | 2005 | 18 Pages |
Abstract
A miniaturized plane probe (5Ã5Ã1.1mm3) was developed to measure on-line local and unsteady convective heat transfer coefficients (h) in complex flows. The proposed method is in particular dedicated to assess h at the surface of porous media subjected to mass transport that interacts with the surrounding flow such as those that occur between a partially saturated porous medium and hot fluid phase (superheated steam, oil, etc.). The active h-probe consisted of a combination of a film heater sandwiched between two heat flux sensors, and h was obtained on each side from temperature and flux outputs of flux sensors in response to a periodic input of heating (maximum increase in probe surface temperature <2.5âC). In controlled hydrodynamic conditions, it was found that 3 cycles of 1Â Hz measurements ensured h relative errors ranged between â3% and â0.5% with 98% confidence for h values ranged between 200 and 500Wm-2K-1.
Related Topics
Physical Sciences and Engineering
Chemical Engineering
Chemical Engineering (General)
Authors
Olivier Vitrac, Gilles Trystram,