Drying Furnace Experiment September 23,1998 Engineering 435 By Michael McGann & Michael Hobbs

Outline Introduction Background and Theory Procedure Results Conclusions Summary

Introduction Drying furnace experiment H 2 O added to dry sand Cake pan placed in furnace Determined drying rate(g/min) Determined flux(g/min/cm 2 ) Raw data produced drying curves

Background and Theory Heat in Dry air in Moist air out Drying Furnace Schematic

Background and Theory(cont.) Pan Location Schematic Pan 3 Pan 4Pan 1 Pan 7Pan 2 Pan 6 Pan 8Pan 5

Background and Theory(cont.) Heat transfer principles Mass transfer principles Electronic data acquisition Drying furnace systems in McCabe,Smith, & Harriot

Procedure Measured Dry sand and H 2 O Placed in drying furnace for duration of time Raw data acquired from strain gage electronically End time, measured  weight

Results Linear drying rate in region observed Results on Table1 Strain gage conversion on Table 2 Figure 1, Strain gage conversion curve Figure2, Drying History/Drying Rate Curve

Table 1. Results

Table 2. Weight Conversion Data

Total Moisture Content Drying Rate

Conclusions Electronic data confidence level at 95% Drying rates concurred with theory Short drying time limited information Different drying rates at different locales Air flow uneven throughout dryer

Summary Constant-rate period observed Short drying times limited observations Different samples dried at different rates due to location within dryer.

Questions?????