A liquid crystal thermographic study of a heated cyclinder in cross flow
By: [by] Thomas E. Cooper, Richard J. Field [and] John F. Meyer
Contributors: Field, Richard Johns; Meyer, John Ferrandello; Naval Postgraduate School (U.S.)
Publisher: Naval Postgraduate School
Published: 1974
Place of publication: Monterey, Calif
Language: eng
Number of pages: 50
Subjects: Transmission; Heat; Fluid dynamics; Research
Description: A thermographic technique is presented that allows visual determination of both qualitative and quantitative heat transfer and fluid flow information to be obtained on heated objects placed in forced convection environments.  The technique employs cholesteric liquid crystals as the temperature sensing agent.  The liquid crystals indicate temperature by exhibiting brilliant changes in color over discrete, reproducible temperature ranges.  The technique has been used to quickly and easily obtain information on the variation of the Nusselt number on right circular cylinder placed in a crossflow of air.  In addition to yielding precise quantitative heat transfer information, the liquid crystal thermographic technique afforded the opportunity to visually observe the effects of the flow separation, the separation bubble region, the turbulent boundary layer, and the turbulent wake on the surface temperature of the heated cylinder.  The experimental results obtained using the liquid crystal thermographic technique are in close agreement with results obtained by other investigators who have used standard measuring techniques. (Author)
Notes: Title from cover.

"Prepared for: Chief of Naval Research, Arlington, Virginia 22217, and Naval Weapons Center, China Lake, California 93555"--Cover.

"November 1974"--Cover.

"NPS-59Cg74111"--Cover.

"Annual report for period January 1974 - October 1974."

Includes bibliographical references (p. 45-49)

"Approved for public release; distribution unlimited"--Cover.

Technical report; 1974.