Infrared Imaging Results of an Excited Planar Jet

Research output: Contribution to conferencePaperpeer-review


Planar jets are used for many applications including heating, cooling, and ventilation. Generally such a jet is designed to provide good mixing within an enclosure. In building applications, the jet provides both thermal comfort and adequate indoor air quality. Increased mixing rates may lead to lower short-circuiting of conditioned air, elimination of dead zones within the occupied zone, reduced energy costs, increased occupant comfort, and higher indoor air quality. This paper discusses using an infrared imaging system to show the effect of excitation of a jet on the spread angle and on the jet mixing efficiency. Infrared imaging captures a large number of data points in real time (over 50,000 data points per image) providing significant advantages over single-point measurements. We used a screen mesh with a time constant of approximately 0.3 seconds as a target for the infrared camera to detect temperature variations in the jet. The infrared images show increased jet spread due to excitation of the jet. Digital data reduction and analysis show changes in jet isotherms and quantify the increased mixing caused by excitation.

Original languageAmerican English
Number of pages7
StatePublished - 1992
Event1992 ASME-JSES-KSES International Solar Energy Conference Part 1 (of 2) - Maui, HI, USA
Duration: 5 Apr 19929 Apr 1992


Conference1992 ASME-JSES-KSES International Solar Energy Conference Part 1 (of 2)
CityMaui, HI, USA

NREL Publication Number

  • ACNR/CP-14956


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