electrohydrodynamics laboratory + - + + + + + + + + + + + + + + - - - - - - - - - - - - - - y. feng...
TRANSCRIPT
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Electrohydrodynamics Laboratory
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Y. Feng and J. YagoobiHeat Transfer Enhancement and Two-Phase Flow
LaboratoryMechanical, Materials, and Aerospace Engr. Dept.
Illinois Institute of TechnologyChicago, USA
Control of Liquid and Liquid/Vapor Flow Distributions With EHD
Conduction Pumping
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Electrohydrodynamics Laboratory
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thermal management of parallel evaporators and condensers
correct liquid distribution required among parallel lines
local hot areas and dry-outs due to mal-distribution
EHD pumping as an active control method conduction pumping, a right choice
Motivation
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EHD Conduction Pump Electrode
Design Schematic
Net flow
Pipewall
Heterochargelayer
Ring ground electrode
Perforatedelectrode
d=4.3 mm
y
x
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Electrode Picture
Ring ground electrode
Perforated electrode
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Working Fluid, R-123
e
(S/m)
(m2/V . s)
4.8 2.7E-8 4.8E-8
(Pa . s)
(kg/m3)
hfg
(kJ/kg)
417.6E-6 1464 171.4
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900
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0 3 6 9 12 15 18
Applied Voltage (kV)
Ge
ne
rate
d P
ress
ure
(P
a)
Experimental Data
Pressure Generation in the Absence of a Net Flow
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Spark Plug
Teflon Spacer
PerforatedElectrode Ring Ground
Electrode Teflon Tube
Brass
0.8 mm
2.5 mm3.6 mm
23.6 mm
152.4 mm
10.2 mm
EHD Conduction Pump with Three Electrode Pairs
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F
F
REFRIGERANT PUMP
CHILLERSUPPLY
CHILLER RETURN
PRE-HEATER
ACCUMULATOR
CONDENSER
F
P
SIGHT GLASS
SIGHT GLASS
Thermocouple Probe EHD Conduction PumpEHD FilterF FlowmeterP Pressure Transducer
Refrigerant Chiller (water/methanol) ValveSight Glass
REFRIGERANTRESERVOIR
MA
NIF
OLDEHD
P
PCONDENSER
P
F
BRANCH 1
BRANCH 2
TEST SECTION
Flow Distribution Control Apparatus
Utilizing EHD Conduction Pump
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Experimental Results – Liquid Phase
(mass flux = 100 kg/m2s, T = 25 C)
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0
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100
120
0 2 4 6 8 10 12Time (min)
Mas
s Flu
x (k
g/m
2 s)Flow Distribution, e = 10 kV
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0 2 4 6 8 10 12
Time (min)
Curr
ent ( A
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0
4
8
12
16
20
Applie
d V
oltage (kV
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Current Consumption, e = 10 kV
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0 2 4 6 8 10 12 14Time (min)
Mas
s Flu
x (k
g/m
2 s)Flow Distribution, e = 15 kV
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Time (min)
Curr
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0
5
10
15
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25
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Applie
d V
olta
ge (kV
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Current Consumption, e = 15 kV
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Experimental Results – Liquid/Vapor Phases
(mass flux = 50 kg/m2s, Tsat = 25 C)
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Pressure drop along EHD pump
15 kV 17 kV 18 kV 20 kV
-1500
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500
0 200 400 600 800 1000 1200 1400
Time (s)
D P (
Pa
)Pressure Drop Along EHD Conduction Pump
and Branch Tube, Vapor Quality = 6%
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0 200 400 600 800 1000 1200 1400Time (s)
D P (
Pa)
Pressure Drop Along the Other Branch Tube, Vapor Quality = 6%
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Pressure drop along EHD pump
15 kV 17 kV 18 kV 20 kV
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0 200 400 600 800 1000 1200 1400
Time (s)
D P (
Pa
)Pressure Drop Along EHD Conduction Pump
and Branch Tube, Vapor Quality = 20%
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D P (
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Pressure Drop Along the Other Branch Tube, Vapor Quality = 20%
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Pressure drop along EHD pump
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Time (s)
D P (
Pa
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and Branch Tube, Vapor Quality = 26%
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D P (
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Conclusions
Electrically driven flow generated by the EHD conduction pump successfully controlled the flow distribution between two parallel branch lines.
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Acknowledgement
American Society of Heating, Refrigerating and Air Conditioning Engineers.