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Sustained supersaturation for condensation growth of particles

A particle and coil technology, applied in particle suspension analysis, vapor condensation, chemical instruments and methods, etc., can solve the problem of limiting the size of formed droplets

Active Publication Date: 2019-10-18
AEROSOL DYNAMICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This limited time also limits the size of the formed droplets since most of the condensation growth occurs in this peak supersaturation region

Method used

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  • Sustained supersaturation for condensation growth of particles
  • Sustained supersaturation for condensation growth of particles
  • Sustained supersaturation for condensation growth of particles

Examples

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Embodiment Construction

[0027] A technique is presented that involves the expansion of airborne particles by condensate growth of water or other vapors to form droplets that are readily optically detectable, inertially trapped, or aerodynamically aggregated.

[0028] A growth tube structure and a method of operating a growth tube are provided. The methods and apparatus of the present technology provide various configurations of "growth tube sandwiches" in which flow travels in an axial direction along a wetted wall tube whose wall temperature varies with Angular position varies, but is approximately constant with axial position. In this context, "constant" means that the angular position of the heating and cooling sections discussed herein may vary by one or a few degrees, but remain within the upper or lower half of the tube cross-section along the length of the tube . For example, walls may be warmer in angular positions from about 20° to about 160° (relative to a common origin) and warmer along ...

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Abstract

An apparatus and method for producing enlarged particles in a stream. The apparatus includes coiled tubing having a pipe diameter and a coil diameter, the pipe having an input end receiving flow and an output end, the pipe having a length between the input end and the output end. The heater heats a first portion of the tube along a first longitudinal portion of the tube, and the cooler cools a second longitudinal portion of the tube along at least a second portion of the tube. The method includes heating a first portion of the tube along a first longitudinal portion of the tube while simultaneously cooling a second portion of the tube along at least a second longitudinal portion of the tube. During heating and cooling, the method includes introducing flow into the interior of the tube at the input and moving the flow towards the output.

Description

Background technique [0001] Condensation growth systems have been used to expand submicron-sized atomized particles to form droplets. These aerosolized particles may be airborne, or carried by another process gas such as nitrogen, but are defined as particles of condensed matter (liquid or solid) suspended in a gas that are too small to pass through gravity Settling on the timescale of interest. Typically the aerosolized particles of interest are less than a few microns in diameter. For ease of measurement, these particles can grow by condensation to form larger droplets that are easier to detect or manipulate than the original particles. For example, droplets can be detected optically, captured inertially or focused aerodynamically. [0002] For small particles, initiation of condensation growth occurs by exposing the particles to a region of vapor supersaturation, defined as the region where the vapor pressure of the condensing vapor is higher than its saturation value on...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D5/00G01N15/06
CPCB01D5/0006G01N15/065G01N2015/0681B01J8/087B01J2208/00026B01J2208/00203
Inventor 苏珊·维拉·郝林史蒂文·拉塞尔·斯皮尔曼
Owner AEROSOL DYNAMICS INC
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