Mist Cooling of the Hibachi Window S.Shin, V.Novak, D.Sadowski, K.Schoonover, and S. AbdelKhalik - PowerPoint PPT Presentation

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Mist Cooling of the Hibachi Window S.Shin, V.Novak, D.Sadowski, K.Schoonover, and S. AbdelKhalik

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Anode Foil * Fluorinert Electronic Liquid FC-72 manufactured by 3M company. 3 ... model to predict the foils' thermal response under prototypical conditions has ... – PowerPoint PPT presentation

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Title: Mist Cooling of the Hibachi Window S.Shin, V.Novak, D.Sadowski, K.Schoonover, and S. AbdelKhalik


1
Mist Cooling of the Hibachi WindowS.Shin,
V.Novak, D.Sadowski, K.Schoonover, and S.
Abdel-Khalik
HAPL meeting, Atlanta, GA (February, 5-6, 2004)
G. W. Woodruff School of Mechanical
Engineering Atlanta, GA 303320405 USA
2
Objectives
  • Develop a validated mechanistic model for
    gas/liquid mist cooling of Heated Channels
  • Compare the effectiveness of different coolants
    Air/Water, Helium/Water, and Helium/FC-72 for
    prototypical Hibachi geometry

Fluorinert Electronic Liquid FC-72 manufactured
by 3M company
3
Particle Distribution
Particle Temperature
Particle Temperature
Particle Temperature
Air 15m/s / Water 15
Helium 30m/s / Water 33
Helium 30m/s / FC-72 33
4
Steady State Conditions (Air/Water)Effect of
Liquid Mass Fraction
Coolant Bulk Temperature
Wall and Coolant Temperature Distribution
Density
? kg/m3
T K
Solid line Coolant bulk temperature Dash dot
line Wall temperature
z cm
z cm
15m/s Air Qw250W rp30 ?m
Heat transfer coefficient at the wall
Wall film thickness
5
Effect of Gas Coolant Helium/Water vs. Air/Water
Coolant Bulk Temperature
Coolant Exit Temperature
Wall and Coolant Temperature Distribution
Density
Water/Air
Water/Air
Water/Helium
? kg/m3
Water/Helium
T K
Water/Air
Solid line Coolant bulk temperature Dash dot
line Wall temperature
Water/Helium
z cm
z cm
Heat transfer coefficient at the wall
Wall film thickness
Qw250W rp30 ?m
Water/Helium
Water/Air
Water/Air
Water/Helium
Water/Helium
Water/Air
dry Air (15m/s, Qw250W)
6
Steady State Conditions (Helium/Water)Effect of
Liquid Mass Fraction
Coolant Bulk Temperature
Coolant Exit Temperature
Density
? kg/m3
T K
z cm
z cm
Heat transfer coefficient at the wall
Wall film thickness
30m/s Helium Qw250W rp30 ?m
7
Effect of Liquid Coolant Helium/Water vs.
Helium/FC-72
Coolant Bulk Temperature
Coolant Exit Temperature
Wall and Coolant Temperature Distribution
Density
FC-72/Helium
FC-72/Helium
? kg/m3
Solid line Coolant bulk temperature Dash dot
line Wall temperature
T K
FC-72/Helium
Water/Helium
Water/Helium
Water/Helium
z cm
z cm
Heat transfer coefficient at the wall
Wall film thickness
Qw250W rp30 ?m
Water/Helium
Water/Helium
Water/Helium
FC-72/Helium
FC-72/Helium
dry Helium (30m/s, Qw250W)
FC-72/Helium2
8
Steady State Conditions (Helium/FC-72)Effect of
Liquid Mass Fraction
Coolant Bulk Temperature
Coolant Exit Temperature
Wall and Coolant Temperature Distribution
Density
? kg/m3
T K
Solid line Coolant bulk temperature Dash dot
line Wall temperature
z cm
z cm
Heat transfer coefficient at the wall
Wall film thickness
30m/s Helium Qw250W rp30 ?m
33 FC-72 66 FC-72 132 FC-72
dry Helium (30m/s, Qw250W)
9
Conclusions
  • A validated mechanistic model to predict the
    foils thermal response under prototypical
    conditions has been developed
  • Helium/Water Mists produce the highest heat
    transfer coefficients followed closely by
    Air/Water Mists
  • The use of FC-72 as a liquid in Mist Cooling of
    the Hibachi Window is not recommended
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