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The National Technical Information Service acquires, indexes, abstracts, and archives the largest collection of U.S. government-sponsored technical reports in existence. The NTRL offers online, free and open access to these authenticated government technical reports. Technical reports and documents in its repository may be available online for free either from the issuing federal agency, the U.S. Government Publishing Office’s Federal Digital System website, or through search engines.

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Study of Electrostatic Effects on Condensing Heat Transfer.

AD467747

Publication Date	1965
Personal Author	Choi, H. Y.; Reynolds, J. M.
Page Count	124
Abstract	A study program is presented on the effects of strong electric fields on condensation heat transfer and two-phase flow. It has been confirmed that significant changes in the flow regimes and heat transfer are possible with negligible electrical power expenditure. Over 100 per cent increase in heat transfer has been attained with pressure drop increases which are of the order of 15 per cent in the annular flow regime. These investigations were performed on two separate apparatus: one at Tufts University in which heat transfer phenomena in condensation were investigated and one at the Massachusetts Institute of Technology in which hydrodynamic phenomena in two-phase flow were studied. Results show that the slug flow regime is substantially suppressed. In essence, slug flow occurs only in the region of very low gas flows in which the system is almost entirely gravity dependent. The increase in heat transfer rates is gradual up to a certain threshold value of the applied voltage; beyond this value, the increase is steep. Some progress has been made in analytical and physical modeling of the phenomenon both from the viewpoint of determining pressure drop and heat transfer and of aiding in the determination of the fluid configuration at the heat transfer surface. (Author)
Keywords	Heat transfer Condensation Electric fields Electrostatics Condensers(Liquefiers) Gas flow Pressure Test equipment Heat exchangers Fluid mechanics Voltage Computer programming
Source Agency	Non Paid Delimited ADS Delimited-No Subject Categories Batch C
Corporate Authors	Tufts Univ., Medford, MA.
Supplemental Notes	In cooperation with Massachusetts Institute of Technology, Cambridge.
Document Type	Technical Report
Title Note	Final rept., Feb 63-May 64.
NTIS Issue Number	198114
Contract Number	AF 33(657)-10908

Study of Electrostatic Effects on Condensing Heat Transfer.

Study of Electrostatic Effects on Condensing Heat Transfer.
AD467747

Publication Date	1965
Personal Author	Choi, H. Y.; Reynolds, J. M.
Page Count	124
Abstract	A study program is presented on the effects of strong electric fields on condensation heat transfer and two-phase flow. It has been confirmed that significant changes in the flow regimes and heat transfer are possible with negligible electrical power expenditure. Over 100 per cent increase in heat transfer has been attained with pressure drop increases which are of the order of 15 per cent in the annular flow regime. These investigations were performed on two separate apparatus: one at Tufts University in which heat transfer phenomena in condensation were investigated and one at the Massachusetts Institute of Technology in which hydrodynamic phenomena in two-phase flow were studied. Results show that the slug flow regime is substantially suppressed. In essence, slug flow occurs only in the region of very low gas flows in which the system is almost entirely gravity dependent. The increase in heat transfer rates is gradual up to a certain threshold value of the applied voltage; beyond this value, the increase is steep. Some progress has been made in analytical and physical modeling of the phenomenon both from the viewpoint of determining pressure drop and heat transfer and of aiding in the determination of the fluid configuration at the heat transfer surface. (Author)
Keywords	Heat transfer Condensation Electric fields Electrostatics Condensers(Liquefiers) Gas flow Pressure Test equipment Heat exchangers Fluid mechanics Voltage Computer programming
Source Agency	Non Paid Delimited ADS Delimited-No Subject Categories Batch C
Corporate Authors	Tufts Univ., Medford, MA.
Supplemental Notes	In cooperation with Massachusetts Institute of Technology, Cambridge.
Document Type	Technical Report
Title Note	Final rept., Feb 63-May 64.
NTIS Issue Number	198114
Contract Number	AF 33(657)-10908