# Determining Flow in a Cylindrical Conduit using a 2-Dimensional Fast Fourier Transform

## Abstract

An acoustic array with 128 equally spacedtransducers is used to collect acoustic data to determine rate of flow in a pipe. A speed of sound of 350 m/s in air is assumed. To determine to rate of flow in a cylindrical conduit, a Two-Dimensional Fast Fourier Transform (2DFFT) is used to convert spatial and temporal data into a frequency versus wavenumber plot. A Two- Dimensional Fast Fourier Transform has the ability to separate out a right to left flowing wave from a left to right flowing wave. This plot can be used to determine the flow by finding the slope of the major diagonal line.

## Session Name:

Poster Presentation Session #2 - Poster #02

## Start Date

10-4-2015 12:15 PM

## End Date

10-4-2015 1:00 PM

## Location

HSB 3rd Floor Student Commons

Determining Flow in a Cylindrical Conduit using a 2-Dimensional Fast Fourier Transform

HSB 3rd Floor Student Commons

An acoustic array with 128 equally spacedtransducers is used to collect acoustic data to determine rate of flow in a pipe. A speed of sound of 350 m/s in air is assumed. To determine to rate of flow in a cylindrical conduit, a Two-Dimensional Fast Fourier Transform (2DFFT) is used to convert spatial and temporal data into a frequency versus wavenumber plot. A Two- Dimensional Fast Fourier Transform has the ability to separate out a right to left flowing wave from a left to right flowing wave. This plot can be used to determine the flow by finding the slope of the major diagonal line.