by andrew t. o’neill 3-23-05
DESCRIPTION
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. - PowerPoint PPT PresentationTRANSCRIPT
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
Topics of Discussion Introduction Experimental Apparatus Experimental Procedure Results Conclusion
Introduction Background
Automotive Application Previous Research
Objective Realistic Conditions Experimental Data
Experimental Apparatus Flow Loop Test Section Heater Instrumentation
Flow Loop
Flow Loop Control Pressure Flow Rate Temperatur
e
Flow Loop Instrumentation Flow Rate
Turbine Flow Meter
Temperature 3 TCs
Test Section
Heater Section
Test Section Instrumentation Pressure
0-100psia 4 TCs
E-type Embedded in Heater Element
Heater Element
(Dimensions in mm)
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)
Heater Assembly
Data Acquisition National Instruments
LabView Software PCI-MIO-16E-4 Hardware SCXI Signal Conditioning
1102 Module, 1303 Breakout Box 1124 Module, 1325 Breakout Box
Data Acquisition Cont. Measurements
Flow Rate Temperature
Bulk Fluid Heater
Pressure Control
Bulk Heating Heater Power
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
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
Experimental Procedure Loop Filling
Cleaning Evacuating Degassing Working Fluid
Data Collection
Loop Filling Cleaning
Acetone Solvent Evacuating
Dual Stage Rotary Vane Vacuum Pump -5°C Cold Trap
Degassing Pressure Vessel After Filling
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
Data Collection Cont.
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
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
Water Results Effect of Velocity Effect of Subcooling
Due to Bulk Temperature Due to System Pressure
Effect of Pressure
Effect of Velocity
Effect of Velocity
Boiling at 90°C, 1.00atm, and 0.5m/s
Boiling at 90°C, 1.00atm, and 1.0m/s
Effect of Velocity
Boiling at 90°C, 1.00atm, and 2.0m/s
Boiling at 90°C, 1.00atm, and3.0m/s
Effect of Subcooling
Effect of Subcooling
Effect of Subcooling
Effect of Subcooling
Boiling at 90°C, 1.00atm, and 0.5m/s
Effect of Subcooling
Boiling at 90°C, 1.41atm, and 0.5m/s
Effect of Subcooling
Boiling at 90°C, 1. 97atm, and 0.5m/s
Effect of Subcooling
Boiling at 90°C, 2.61atm, and 0.5m/s
Effect of Pressure
Effect of Pressure
Boiling at 90°C, 1.00atm, and 0.5m/s
Boiling at 100°C, 1.41atm, and 0.5m/s
Effect of Pressure
Boiling at 110°C, 1.97atm, and 0.5m/s
Boiling at 120°C, 2.61atm, and 0.5m/s
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
Ethylene Glycol Results Effect of Velocity Effect of Subcooling
Due to Bulk Temperature Due to System Pressure
Effect of Pressure
Effect of Velocity
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
Effect of Subcooling
Effect of Subcooling
Effect of Subcooling
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
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
Effect of Pressure
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
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
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.
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
Similar Response to Velocity &Increased Wall Superheat
Effect of System Pressure
Subcooling at Constant Pressure
Subcooling at Constant Inlet Temperature
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
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
Questions?