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The electrostatic atomization of hydrocarbons

Journal Article:

Abstract

Exploitation of the unique and potentially beneficial characteristics of electrostatic atomization in combustion systems has foundered upon the inability of two element, diode devices to operate at flow rates that are larger than a fraction of a millilitre per second. This restriction has been attributed to the high innate electrical resistivity of hydrocarbon fuels. A discussion of proposed electrostatic fuel atomizers and their limitations is presented from the vantage of a recently developed theory of electrostatic spraying. Comparison of theory and experiment reveals the existence of a 'constant of spraying' and the presence of an operational regime in which low charge density droplet development is possible. Operation with hydrocarbons in this regime occurs when the mean droplet size is greater than or equal to 10 ..mu..m and fluid viscosity is below about 250 cp. The resulting spray has a mean droplet size that is functionally dependent only upon the free charge density level of the fluid. Consequently there is no theoretical impediment to the attainment of high flow rate electrostatic atomization with fluids of arbitrary conductivity. Implementation is achieved by a general class of electrostatic spray devices which employ direct charge injection. The Spray Triode, a submerged field-emission electron gun,  More>>
Authors:
Publication Date:
Jun 01, 1984
Product Type:
Journal Article
Reference Number:
EDB-85-029276
Resource Relation:
Journal Name: J. Inst. Energy; (United Kingdom); Journal Volume: 57:431
Subject:
42 ENGINEERING; 32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; COMBUSTION CHAMBERS; ATOMIZATION; FOSSIL FUELS; CHARGE DENSITY; DROPLETS; ELECTRIC CONDUCTIVITY; ELECTROSTATICS; FLOW RATE; PARTICLE SIZE; SEMICONDUCTOR DIODES; SPRAYS; ELECTRICAL PROPERTIES; ENERGY SOURCES; FUELS; PARTICLES; PHYSICAL PROPERTIES; SEMICONDUCTOR DEVICES; SIZE; 421000* - Engineering- Combustion Systems; 320303 - Energy Conservation, Consumption, & Utilization- Industrial & Agricultural Processes- Equipment & Processes
OSTI ID:
6274252
Research Organizations:
Exxon Research and Engineering Company, Linden, NJ
Country of Origin:
United Kingdom
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: JINED
Submitting Site:
HEDB
Size:
Pages: 312-320
Announcement Date:
Dec 01, 1984

Journal Article:

Citation Formats

Kelly, A J. The electrostatic atomization of hydrocarbons. United Kingdom: N. p., 1984. Web.
Kelly, A J. The electrostatic atomization of hydrocarbons. United Kingdom.
Kelly, A J. 1984. "The electrostatic atomization of hydrocarbons." United Kingdom.
@misc{etde_6274252,
title = {The electrostatic atomization of hydrocarbons}
author = {Kelly, A J}
abstractNote = {Exploitation of the unique and potentially beneficial characteristics of electrostatic atomization in combustion systems has foundered upon the inability of two element, diode devices to operate at flow rates that are larger than a fraction of a millilitre per second. This restriction has been attributed to the high innate electrical resistivity of hydrocarbon fuels. A discussion of proposed electrostatic fuel atomizers and their limitations is presented from the vantage of a recently developed theory of electrostatic spraying. Comparison of theory and experiment reveals the existence of a 'constant of spraying' and the presence of an operational regime in which low charge density droplet development is possible. Operation with hydrocarbons in this regime occurs when the mean droplet size is greater than or equal to 10 ..mu..m and fluid viscosity is below about 250 cp. The resulting spray has a mean droplet size that is functionally dependent only upon the free charge density level of the fluid. Consequently there is no theoretical impediment to the attainment of high flow rate electrostatic atomization with fluids of arbitrary conductivity. Implementation is achieved by a general class of electrostatic spray devices which employ direct charge injection. The Spray Triode, a submerged field-emission electron gun, represents a particularly simple member of this new class of atomizer. Among the Spray Triode operational characteristics to be discussed is insensitivity to spray fluid properties and flow rate.}
journal = {J. Inst. Energy; (United Kingdom)}
volume = {57:431}
journal type = {AC}
place = {United Kingdom}
year = {1984}
month = {Jun}
}