Scheduled System Maintenance on December 17th, 2014:
IEEE Xplore will be upgraded between 2:00 and 5:00 PM EST (18:00 - 21:00) UTC. During this time there may be intermittent impact on performance. We apologize for any inconvenience.
By Topic

A Null-Buoyancy Thermal Flow Meter With Potential Application to the Measurement of the Hydraulic Conductivity of Soils

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
Skinner, A.J. ; Meas. Eng. Australia, Adelaide, SA, Australia ; Wallace, A.K. ; Lambert, M.F.

A null-buoyancy thermal flow sensor is described; it is designed specifically for the measurement of very slow downward fluid flows in a vertical pipe in which a glass-rod thermistor is concentrically located. Sensor power dissipation in this thermistor is adjusted so that the upward thrust of the buoyant thermal plume from the warm thermistor sensor exactly counterbalances the downward bulk fluid velocity. This results in flow stagnation at the sensor tip characterized by a local peak in the sensor's temperature. Experimental results agreed with CFD and engineering models to suggest that the required power level needed to counterbalance the downward velocity at this null-buoyancy point depends upon the square of the velocity over the narrow velocity range between 0.25 mm/s and 2.5 mm/s. The flow sensor has been designed to have the potential to measure the infiltration rate of water into different soil types by applying it to a simpler form of the common disc permeameter (tension-infiltrometer) used to determine the hydraulic conductivity of soils.

Published in:

Sensors Journal, IEEE  (Volume:11 ,  Issue: 1 )