1 / 58

By Andrew T. O’Neill 3-23-05

Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating. By Andrew T. O’Neill 3-23-05. Topics of Discussion. Introduction Experimental Apparatus Experimental Procedure Results Conclusion. Introduction.

hija
Download Presentation

By Andrew T. O’Neill 3-23-05

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. O’Neill 3-23-05

  2. Topics of Discussion • Introduction • Experimental Apparatus • Experimental Procedure • Results • Conclusion

  3. Introduction • Background • Automotive Application • Previous Research • Objective • Realistic Conditions • Experimental Data

  4. Experimental Apparatus • Flow Loop • Test Section • Heater • Instrumentation

  5. Flow Loop

  6. Flow Loop Control • Pressure • Flow Rate • Temperature

  7. Flow Loop Instrumentation • Flow Rate • Turbine Flow Meter • Temperature • 3 TCs

  8. Test Section

  9. Heater Section

  10. Test Section Instrumentation • Pressure • 0-100psia • 4 TCs • E-type • Embedded in Heater Element

  11. Heater Element (Dimensions in mm)

  12. Heater Thermocouples • 4 TCs • 3 Along Surface • 1 Pair • Surface Temp • Heat Flux (Dimensions in mm)

  13. Heater Assembly

  14. Data Acquisition • National Instruments • LabView Software • PCI-MIO-16E-4 Hardware • SCXI Signal Conditioning • 1102 Module, 1303 Breakout Box • 1124 Module, 1325 Breakout Box

  15. Data Acquisition Cont. • Measurements • Flow Rate • Temperature • Bulk Fluid • Heater • Pressure • Control • Bulk Heating • Heater Power

  16. Assumptions • Steady State Condition • 1-D Heat Transfer in Copper Element • Stabilized Surface Temp and Heat Flux • Inlet Temp Used as Bulk Fluid Temp • Fluid Pressure • Average of Upstream and Downstream Measurements

  17. Experimental Uncertainty • Flow Rate / Velocity • ±1.9 lpm + 2% of reading • ±0.05 m/s + 2% of reading • System Pressure • ±0.017 atm + 0.86% of reading • Bulk Temperature • ±1.6°C • Heater Temperature • ±1.5°C to actual • ±0.18°C relative • Heat Flux • ±0.142 W/cm2 + 5% of reading

  18. Experimental Procedure • Loop Filling • Cleaning • Evacuating • Degassing Working Fluid • Data Collection

  19. Loop Filling • Cleaning • Acetone Solvent • Evacuating • Dual Stage Rotary Vane Vacuum Pump • -5°C Cold Trap • Degassing • Pressure Vessel • After Filling

  20. Data Collection • Bulk Conditions Set • Pressure • Inlet Temperature • Flow Rate • Systematic Curve Development • 1000 Samples/s • 250 Samples/update • 900 Updates After Heat Flux Change • 100 Updates Recorded

  21. Data Collection Cont.

  22. Inlet Temperature 50ºC 70ºC 90ºC 100ºC 110ºC 0.5 m/s 1.00atm 1.00atm 1.00atm, 1.41atm, 1.97atm, 2.61atm 1.41atm 1.97atm 1.0 m/s 1.00atm 1.00atm 1.00atm, 1.41atm, 1.97atm 2.0 m/s 1.00atm 1.00atm 1.00atm, 1.41atm, 1.97atm 3.0 m/s 1.00atm 1.00atm 4.0 m/s 1.00atm 1.00atm Data Collection Cont. Bulk Conditions for Water Mean Velocity

  23. Inlet Temperature 58.8ºC 78.8ºC 98.8ºC 108.8ºC 118.8ºC 128.8ºC 0.5 m/s 1.00atm 1.00atm 1.00atm, 1.34atm, 1.82atm, 2.45atm 1.34atm 1.82atm 2.45atm 1.0 m/s 1.00atm 1.00atm 1.00atm, 1.34atm, 1.82atm 2.0 m/s 1.00atm 1.00atm 1.00atm, 1.34atm, 1.82atm 3.0 m/s 1.00atm 1.00atm 4.0 m/s 1.00atm 1.00atm Data Collection Cont. Bulk Conditions for Ethylene Glycol Mean Velocity

  24. Water Results • Effect of Velocity • Effect of Subcooling • Due to Bulk Temperature • Due to System Pressure • Effect of Pressure

  25. Effect of Velocity

  26. Effect of Velocity Boiling at 90°C, 1.00atm, and 0.5m/s Boiling at 90°C, 1.00atm, and 1.0m/s

  27. Effect of Velocity Boiling at 90°C, 1.00atm, and 2.0m/s Boiling at 90°C, 1.00atm, and3.0m/s

  28. Effect of Subcooling

  29. Effect of Subcooling

  30. Effect of Subcooling

  31. Effect of Subcooling Boiling at 90°C, 1.00atm, and 0.5m/s

  32. Effect of Subcooling Boiling at 90°C, 1.41atm, and 0.5m/s

  33. Effect of Subcooling Boiling at 90°C, 1. 97atm, and 0.5m/s

  34. Effect of Subcooling Boiling at 90°C, 2.61atm, and 0.5m/s

  35. Effect of Pressure

  36. Effect of Pressure Boiling at 90°C, 1.00atm, and 0.5m/s Boiling at 100°C, 1.41atm, and 0.5m/s

  37. Effect of Pressure Boiling at 110°C, 1.97atm, and 0.5m/s Boiling at 120°C, 2.61atm, and 0.5m/s

  38. Summary of Water Curves • Convergence of Boiling Curves • Around 20°C Wall Superheat • Independent of: • Velocity • Inlet Temperature • Pressure • Photographic Study • Varied Boiling Behavior • Same Heat Flux and Wall Superheat

  39. Ethylene Glycol Results • Effect of Velocity • Effect of Subcooling • Due to Bulk Temperature • Due to System Pressure • Effect of Pressure

  40. Effect of Velocity

  41. Effect of Velocity Boiling of Glycol at 98.8°C, 0.5m/s, and 1.00atm Boiling of Glycol at 98.8°C, 2.0m/s, and 1.00atm

  42. Effect of Subcooling

  43. Effect of Subcooling

  44. Effect of Subcooling

  45. Effect of Subcooling Boiling of Glycol at 98.8°C, 0.5m/s, and 1.00atm Boiling of Glycol at 98.8°C, 0.5m/s, and 1.34atm

  46. Effect of Subcooling Boiling of Glycol at 98.8°C, 0.5m/s, and 1.80atm Boiling of Glycol at 98.8°C, 0.5m/s, and 2.45atm

  47. Effect of Pressure

  48. Effect of Pressure Boiling of Glycol at 98.8°C, 0.5m/s, and 1.00atm Boiling of Glycol at 108.8°C, 0.5m/s, and 1.34atm

  49. Effect of Pressure Boiling of Glycol at 118.8°C, 0.5m/s, and 1.80atm Boiling of Glycol at 128.8°C, 0.5m/s, and 2.45atm

  50. Summary of Glycol Curves • Boiling Heat Transfer • Independent of: • Velocity • Inlet Temperature • Dependant on System Pressure • Photographic Study • Similar Boiling Behavior with Varied Wall Superheat.

More Related