Drying Furnace Experiment September 23,1998 Engineering 435

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

2. Outline • Introduction • Background and Theory • Procedure • Results • Conclusions • Summary

3. Introduction • Drying furnace experiment • H2O added to dry sand • Cake pan placed in furnace • Determined drying rate(g/min) • Determined flux(g/min/cm2) • Raw data produced drying curves

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

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

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

7. Procedure • Measured Dry sand and H2O • Placed in drying furnace for duration of time • Raw data acquired from strain gage electronically • End time, measured D weight

8. 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

9. Table 1. Results

10. Table 2. Weight Conversion Data

13. Total Moisture Content Drying Rate

14. 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

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

16. Questions?????