Title

Study of Electrostatic Effects on Condensing Heat Transfer

Date

1965

Index Abstract

Coming Soon

Photo Quality

Complete

Report Number

AFFDL TR 65-51

Creator

Choi, Harry Y.

Reynolds, John M., III

Corporate Author

Tufts University and Massachusetts Institute of Technology

Laboratory

Air Force Flight Dynamics Laboratory

Extent

138

NTRL Accession Number

AD467747

Identifier

AD0467747

Access Rights

Notice(s)

Distribution Classification

1

Contract

AF 33(657)-10908

DoD Project

6146

DoD Task

614615

DTIC Record Exists

No

Distribution Change Authority Correspondence

AFWAL LTR

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.

Report Availability

Full text available

Date Issued

1965-05

Provenance

Lockheed Martin Missiles & Fire Control

Type

report

Format

1 online resource