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Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Loca

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.

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Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Loca

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  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.

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