MAPPING SPATIAL DISTRIBUTION OF FLUID FLOWS

Award Information
Agency: Department of Energy
Branch: N/A
Contract: N/A
Agency Tracking Number: 1222
Amount: $48,000.00
Phase: Phase I
Program: SBIR
Awards Year: 1984
Solicitation Year: N/A
Solicitation Topic Code: N/A
Solicitation Number: N/A
Small Business Information
Spectron Development
3303 Harbor Blvd., Suite G-3, Costa Mesa, CA, 92626
DUNS: N/A
HUBZone Owned: N
Woman Owned: N
Socially and Economically Disadvantaged: N
Principal Investigator
 DR. B.P. HILDEBRAND
 SENIOR SCIENTIST
 () -
Business Contact
Phone: () -
Research Institution
N/A
Abstract
THE VELOCITY OF SOUND IN A FLUID IS INFLUENCED BY TEMPERATURE, DENSITY, AND FLUID VELOCITY. THE RECENTLY DEVELOPED TECHNIQUE OF ULTRASONIC TOMOGRAPHY CAN PROVIDE A TWO-DIMENSIONAL MEASUREMENT OF THE ULTRASONIC VECTOR VELOCITY DISTRIBUTION IN A PLANE DEFINED BY A RING OF TRANSDUCERS ENCLOSING THE FLOW. THE TIME-OF-FLIGHT (TOF) IN THE PLANE OF INTEREST IS MEASURED ALONG ALL POSSIBLE PATHS AND INVERTED BY A COMPUTER TO FORM THE VELOCITY MAP. BY PLACING A SECOND RING OF TRANSDUCERS DOWNSTREAM FROM THE FIRST RING, AND MEASURING THE TOF BETWEEN ALL TRANSDUCER PAIRS, IT IS POSSIBLE TO RECONSTRUCT THE THREE-DIMENSIONAL VECTOR VELOCITY FIELD IN A MOVING FLUID. FURTHERMORE, IT IS POSSIBLE TO SEPARATE THE INTRINSIC LOCAL PROPAGATION VELOCITY FROM THE VECTOR VELOCITY OF THE FLUID. SINCE THE LOCAL VELOCITY CAN BE RELATED TO FLUID DENSITY, IT SHOULD BE POSSIBLE TO CALCULATE MASS FLOW ON A LOCAL AS WELL AS GLOBAL BASIS. INCLUSION OF CONSTRAINTS SUCH AS CONSERVATION OF ENERGY, MOMENTUM, MASS AND CONTINUITY PROVIDE MEANS FOR INCREASING THE ACCURACY OF SUCH RECONSTRUCTIONS. IF THE FLUID IS KNOWN TO BE HOMOGENEOUS, ANY VARIATION IN LOCAL SPEED OF SOUND MAY BE RELATED TO TEMPERATURE. IT IS, THEREFORE, POSSIBLE TO PROVIDE A COMPLETE THREE-DIMENSIONAL TEMPERATURE DISTRIBUTION IN ADDITION TO THE VECTOR VELOCITY OF THE FLUID.

* information listed above is at the time of submission.

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