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Title: Thermodynamic Analysis of Nano-Electrospray Induced Gas Jets

Journal Article · · International Journal of Multiphase Flow
 [1];  [2];  [2]
  1. Georgia Institute of Technology, Atlanta, GA (United States); Georgia Institute of Technology
  2. Georgia Institute of Technology, Atlanta, GA (United States)
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Nano-electrospray (nES) produces a plume of charged liquid droplets which have drag interactions with the surrounding gas after they are emitted from a source capillary. The resulting induced gas flow has often been considered unimportant, but we have demonstrated that a gas microjet of significant velocity up to 10s of m/s can be produced. In this work we present a thermodynamic framework that enables analysis of gas jet generation from electrosprays and introduce the important metrics for such analysis, effectiveness (a measure of momentum transfer from the electrosprayed aerosol to gas) and efficiency (a measure of energy conversion from electrical energy generating the electrospray to gas kinetic energy). This analytical framework is applicable to any two-phase flows consisting of discrete conservative-force-driven particles which exchange momentum with an inert, otherwise quiescent fluid medium to yield a co-flowing two-phase jet. Here, we apply this framework to sprays of water from nano-electrospray emitters to demonstrate that increasing the applied electrical potential difference, increasing liquid mass flowrate, and decreasing droplet size all can increase electrospray induced gas jet strength, but only the latter two do so while also increasing the momentum transfer effectiveness and energy conversion efficiency.

Research Organization:
Georgia Institute of Technology, Atlanta, GA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0010729
OSTI ID:
2293607
Journal Information:
International Journal of Multiphase Flow, Journal Name: International Journal of Multiphase Flow Vol. 174; ISSN 0301-9322
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

References (10)

Droplet-gas interactions in nanoelectrospray multiphase flow journal February 2024
Two-way coupled numerical simulation of electrospray with induced gas flow journal November 2013
Dispersion and vaporization of a dilute spray of electrified droplets injected in a coflowing hot gas – Application to the vaporization chamber of a minicombustor journal January 2016
The current emitted by highly conducting Taylor cones journal February 1994
Multifluid Eulerian model of an electrospray in a host gas journal October 2013
Unraveling the Mechanism of Electrospray Ionization journal November 2012
Droplet Evaporation and Discharge Dynamics in Electrospray Ionization † journal October 2002
Electrified droplet fission and the Rayleigh limit journal March 1989
A Comprehensive Framework for the Numerical Simulation of Evaporating Electrosprays journal April 2015
The Electrical Discharge from Liquid Points, and a Hydrostatic Method of Measuring the Electric Intensity at Their Surfaces journal February 1914

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77 NANOSCIENCE AND NANOTECHNOLOGY
CFD
electrohydrodynamics of charged jets
electrospray
gas jet
gas-droplet interactions
nanoelectrospray
thermodynamics