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Visualization of air flow using infrared thermography
Authors:V.?Narayanan  author-information"  >  author-information__contact u-icon-before"  >  mailto:vinod.narayanan@orst.edu"   title="  vinod.narayanan@orst.edu"   itemprop="  email"   data-track="  click"   data-track-action="  Email author"   data-track-label="  "  >Email author,R.?H.?Page,J.?Seyed-Yagoobi
Affiliation:(1) Mechanical Engineering Department, Oregon State University, 204 Rogers Hall, 97331-6001 Corvallis, OR, USA;(2) Department of Mechanical Engineering, Texas A&M University, MS 3123, 77843-3123 College Station, TX, USA;(3) Mechanical, Materials, and Aerospace Engineering Department, Illinois Institute of Technology, 10 W. 32nd Street, 60616 Chicago, IL, USA
Abstract:A technique to visualize airflow using IR thermography is developed. A trace quantity of sulfur hexafluoride (SF6) gas is injected into the flow field to detect intensity patterns using a scanning IR thermography system with a single 8–13 μm bandwidth detector. Equations that relate the intensity patterns to volume-averaged temperature and SF6 mass concentration are presented. The visualization technique involves using a background surface at a known temperature different from that of the flow and image subtraction. The technique is demonstrated on free, impinging, and reattachment subsonic air jets, and is shown to be an effective means of visualizing flows at both elevated and ambient temperatures. Published online: 9 January 2003
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