Title

A novel gas divider using nonlinear laminar flow

Document Type

Article

Publication Date

12-1-2016

Subject Area

ARRAY(0x55ba19169b90)

Abstract

Gas dividers are important in emissions measurement since they continuously and accurately mix two gases to create a known gas concentration that is needed in the multi-point calibration of gas analyzers. A novel gas divider was designed using nonlinear laminar flow induced from the density change along the capillary channels due to the high-pressure drop (relative to the inlet gas pressure). The minor losses from entrance and exit effects can be ignored due to the high pressure loss from Hagen-Poiseuille's law relative to the minor losses. Small diameter wires inside of a tube were used to create capillary channels through which gas could flow. The gas divider, using nonlinear laminar flow, showed lower measurement uncertainty at high (90%) dilution levels than using linear laminar flow due to the higher-pressure drop at the same volumetric flow rates. Experiments showed the expected gas concentration from using the gas divider to be within 2% of the measured gas concentrations.

Publication Title

Flow Measurement and Instrumentation

Volume

52

First Page

255

Last Page

260

Digital Object Identifier (DOI)

10.1016/j.flowmeasinst.2016.10.016

ISSN

09555986

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