Electrohydrodynamics Laboratory + - + + + + + + + + + + + + + + - - - - - - - - - - - - - - Y. Feng and J. Yagoobi Heat Transfer Enhancement and Two-Phase.

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Presentation transcript:

Electrohydrodynamics Laboratory Y. Feng and J. Yagoobi Heat Transfer Enhancement and Two-Phase Flow Laboratory Mechanical, Materials, and Aerospace Engr. Dept. Illinois Institute of Technology Chicago, USA Control of Liquid and Liquid/Vapor Flow Distributions With EHD Conduction Pumping

Electrohydrodynamics Laboratory 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

Electrohydrodynamics Laboratory EHD Conduction Pump Electrode Design Schematic

Electrohydrodynamics Laboratory Electrode Picture

Electrohydrodynamics Laboratory Working Fluid, R-123    e (S/m)  (m 2 /V. s) E-84.8E-8  (Pa. s)  (kg/m 3 ) h fg (kJ/kg) 417.6E

Electrohydrodynamics Laboratory Pressure Generation in the Absence of a Net Flow

Electrohydrodynamics Laboratory EHD Conduction Pump with Three Electrode Pairs

Electrohydrodynamics Laboratory Flow Distribution Control Apparatus Utilizing EHD Conduction Pump

Electrohydrodynamics Laboratory Experimental Results – Liquid Phase (mass flux = 100 kg/m 2 s, T = 25  C)

Electrohydrodynamics Laboratory Flow Distribution,  e = 10 kV

Electrohydrodynamics Laboratory Current Consumption,  e = 10 kV

Electrohydrodynamics Laboratory Flow Distribution,  e = 15 kV

Electrohydrodynamics Laboratory Current Consumption,  e = 15 kV

Electrohydrodynamics Laboratory Experimental Results – Liquid/Vapor Phases (mass flux = 50 kg/m 2 s, T sat = 25  C)

Electrohydrodynamics Laboratory Pressure Drop Along EHD Conduction Pump and Branch Tube, Vapor Quality = 6%

Electrohydrodynamics Laboratory Pressure Drop Along the Other Branch Tube, Vapor Quality = 6%

Electrohydrodynamics Laboratory Pressure Drop Along EHD Conduction Pump and Branch Tube, Vapor Quality = 20%

Electrohydrodynamics Laboratory Pressure Drop Along the Other Branch Tube, Vapor Quality = 20%

Electrohydrodynamics Laboratory Pressure Drop Along EHD Conduction Pump and Branch Tube, Vapor Quality = 26%

Electrohydrodynamics Laboratory Pressure Drop Along the Other Branch Tube, Vapor Quality = 26%

Electrohydrodynamics Laboratory Conclusions Electrically driven flow generated by the EHD conduction pump successfully controlled the flow distribution between two parallel branch lines.

Electrohydrodynamics Laboratory Acknowledgement American Society of Heating, Refrigerating and Air Conditioning Engineers.