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![Page 1: Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. ONeill.](https://reader035.fdocuments.us/reader035/viewer/2022081513/5517b80555034645368b619b/html5/thumbnails/1.jpg)
Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a
Rectangular Channel with Localized Heating
ByAndrew T. O’Neill
3-23-05
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Topics of Discussion Introduction Experimental Apparatus Experimental Procedure Results Conclusion
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Introduction Background
Automotive Application Previous Research
Objective Realistic Conditions Experimental Data
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Experimental Apparatus Flow Loop Test Section Heater Instrumentation
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Flow Loop
![Page 6: Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. ONeill.](https://reader035.fdocuments.us/reader035/viewer/2022081513/5517b80555034645368b619b/html5/thumbnails/6.jpg)
Flow Loop Control Pressure Flow Rate Temperatur
e
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Flow Loop Instrumentation Flow Rate
Turbine Flow Meter
Temperature 3 TCs
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Test Section
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Heater Section
![Page 10: Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. ONeill.](https://reader035.fdocuments.us/reader035/viewer/2022081513/5517b80555034645368b619b/html5/thumbnails/10.jpg)
Test Section Instrumentation Pressure
0-100psia 4 TCs
E-type Embedded in Heater Element
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Heater Element
(Dimensions in mm)
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Heater Thermocouples 4 TCs
3 Along Surface
1 Pair Surface Temp
Heat Flux
Ts T2 T4 T2 0.001m0.005m
qT k
l
T4 T2 394W
m K
0.005m
(Dimensions in mm)
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Heater Assembly
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Data Acquisition National Instruments
LabView Software PCI-MIO-16E-4 Hardware SCXI Signal Conditioning
1102 Module, 1303 Breakout Box 1124 Module, 1325 Breakout Box
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Data Acquisition Cont. Measurements
Flow Rate Temperature
Bulk Fluid Heater
Pressure Control
Bulk Heating Heater Power
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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
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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
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Experimental Procedure Loop Filling
Cleaning Evacuating Degassing Working Fluid
Data Collection
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Loop Filling Cleaning
Acetone Solvent Evacuating
Dual Stage Rotary Vane Vacuum Pump -5°C Cold Trap
Degassing Pressure Vessel After Filling
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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
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Data Collection Cont.
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Data Collection Cont.
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
Bulk Conditions for Water
Mean Velocity
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Data Collection Cont.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
Bulk Conditions for Ethylene Glycol
Mean Velocity
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Water Results Effect of Velocity Effect of Subcooling
Due to Bulk Temperature Due to System Pressure
Effect of Pressure
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Effect of Velocity
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Effect of Velocity
Boiling at 90°C, 1.00atm, and 0.5m/s
Boiling at 90°C, 1.00atm, and 1.0m/s
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Effect of Velocity
Boiling at 90°C, 1.00atm, and 2.0m/s
Boiling at 90°C, 1.00atm, and3.0m/s
![Page 28: Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. ONeill.](https://reader035.fdocuments.us/reader035/viewer/2022081513/5517b80555034645368b619b/html5/thumbnails/28.jpg)
Effect of Subcooling
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Effect of Subcooling
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Effect of Subcooling
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Effect of Subcooling
Boiling at 90°C, 1.00atm, and 0.5m/s
![Page 32: Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. ONeill.](https://reader035.fdocuments.us/reader035/viewer/2022081513/5517b80555034645368b619b/html5/thumbnails/32.jpg)
Effect of Subcooling
Boiling at 90°C, 1.41atm, and 0.5m/s
![Page 33: Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. ONeill.](https://reader035.fdocuments.us/reader035/viewer/2022081513/5517b80555034645368b619b/html5/thumbnails/33.jpg)
Effect of Subcooling
Boiling at 90°C, 1. 97atm, and 0.5m/s
![Page 34: Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. ONeill.](https://reader035.fdocuments.us/reader035/viewer/2022081513/5517b80555034645368b619b/html5/thumbnails/34.jpg)
Effect of Subcooling
Boiling at 90°C, 2.61atm, and 0.5m/s
![Page 35: Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. ONeill.](https://reader035.fdocuments.us/reader035/viewer/2022081513/5517b80555034645368b619b/html5/thumbnails/35.jpg)
Effect of Pressure
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Effect of Pressure
Boiling at 90°C, 1.00atm, and 0.5m/s
Boiling at 100°C, 1.41atm, and 0.5m/s
![Page 37: Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. ONeill.](https://reader035.fdocuments.us/reader035/viewer/2022081513/5517b80555034645368b619b/html5/thumbnails/37.jpg)
Effect of Pressure
Boiling at 110°C, 1.97atm, and 0.5m/s
Boiling at 120°C, 2.61atm, and 0.5m/s
![Page 38: Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. ONeill.](https://reader035.fdocuments.us/reader035/viewer/2022081513/5517b80555034645368b619b/html5/thumbnails/38.jpg)
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
![Page 39: Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. ONeill.](https://reader035.fdocuments.us/reader035/viewer/2022081513/5517b80555034645368b619b/html5/thumbnails/39.jpg)
Ethylene Glycol Results Effect of Velocity Effect of Subcooling
Due to Bulk Temperature Due to System Pressure
Effect of Pressure
![Page 40: Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. ONeill.](https://reader035.fdocuments.us/reader035/viewer/2022081513/5517b80555034645368b619b/html5/thumbnails/40.jpg)
Effect of Velocity
![Page 41: Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. ONeill.](https://reader035.fdocuments.us/reader035/viewer/2022081513/5517b80555034645368b619b/html5/thumbnails/41.jpg)
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
![Page 42: Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. ONeill.](https://reader035.fdocuments.us/reader035/viewer/2022081513/5517b80555034645368b619b/html5/thumbnails/42.jpg)
Effect of Subcooling
![Page 43: Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. ONeill.](https://reader035.fdocuments.us/reader035/viewer/2022081513/5517b80555034645368b619b/html5/thumbnails/43.jpg)
Effect of Subcooling
![Page 44: Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. ONeill.](https://reader035.fdocuments.us/reader035/viewer/2022081513/5517b80555034645368b619b/html5/thumbnails/44.jpg)
Effect of Subcooling
![Page 45: Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. ONeill.](https://reader035.fdocuments.us/reader035/viewer/2022081513/5517b80555034645368b619b/html5/thumbnails/45.jpg)
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
![Page 46: Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. ONeill.](https://reader035.fdocuments.us/reader035/viewer/2022081513/5517b80555034645368b619b/html5/thumbnails/46.jpg)
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
![Page 47: Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. ONeill.](https://reader035.fdocuments.us/reader035/viewer/2022081513/5517b80555034645368b619b/html5/thumbnails/47.jpg)
Effect of Pressure
![Page 48: Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. ONeill.](https://reader035.fdocuments.us/reader035/viewer/2022081513/5517b80555034645368b619b/html5/thumbnails/48.jpg)
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
![Page 49: Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. ONeill.](https://reader035.fdocuments.us/reader035/viewer/2022081513/5517b80555034645368b619b/html5/thumbnails/49.jpg)
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
![Page 50: Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. ONeill.](https://reader035.fdocuments.us/reader035/viewer/2022081513/5517b80555034645368b619b/html5/thumbnails/50.jpg)
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.
![Page 51: Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. ONeill.](https://reader035.fdocuments.us/reader035/viewer/2022081513/5517b80555034645368b619b/html5/thumbnails/51.jpg)
Comparison of Water to Glycol Similar Response to Velocity Increased Wall Superheat with
Boiling Effect of System Pressure Effect of Subcooling
Constant System Pressure Constant Inlet Temperature
Boiling Behavior at High Subcooling
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Similar Response to Velocity &Increased Wall Superheat
![Page 53: Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. ONeill.](https://reader035.fdocuments.us/reader035/viewer/2022081513/5517b80555034645368b619b/html5/thumbnails/53.jpg)
Effect of System Pressure
![Page 54: Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. ONeill.](https://reader035.fdocuments.us/reader035/viewer/2022081513/5517b80555034645368b619b/html5/thumbnails/54.jpg)
Subcooling at Constant Pressure
![Page 55: Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. ONeill.](https://reader035.fdocuments.us/reader035/viewer/2022081513/5517b80555034645368b619b/html5/thumbnails/55.jpg)
Subcooling at Constant Inlet Temperature
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Boiling Behavior at High Subcooling
Boiling of Water at 90°C, 2.61atm, 0.5m/s, and 40°C Subcooling
Boiling of Glycol at 98.8°C, 2.45atm, 0.5m/s, and 40°C Subcooling
![Page 57: Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. ONeill.](https://reader035.fdocuments.us/reader035/viewer/2022081513/5517b80555034645368b619b/html5/thumbnails/57.jpg)
Conclusion Experimental Apparatus
Successfully Constructed Representative of Engine Cooling
System Boiling Curves Developed for Water
and Water Ethylene-Glycol Mixture Showed Effects of:
Velocity Pressure Subcooling
![Page 58: Experimental Determination Of Convection Boiling Curves for Water and Ethylene Glycol in a Rectangular Channel with Localized Heating By Andrew T. ONeill.](https://reader035.fdocuments.us/reader035/viewer/2022081513/5517b80555034645368b619b/html5/thumbnails/58.jpg)
Questions?