Liquid-crystal thermography for full-field temperature mapping in flow over a heated plate with fin banks
Thermal visualization is performed to determine unsteady heat transfer in a flow through an array of slanted fins installed vertically on a heated surface coated with a thin sheet of thermosensitive liquid crystal. A stream of cold air flows through the fin array to remove heat from the heated surface in a wind tunnel. Fins are arranged in in-lined and staggered forms. The fin angle, transverse pitch and longitudinal pitch are varied. The convective heat transfer phenomena can be visualized through color distribution on the liquid crystal sheet which exhibits temperature variation. The unsteady temperature distribution is recorded by a video and the temperature structure for unsteady convective heat transfer can be represented in color. A color image processing is performed on the images obtained to determine the quantitative temperature distribution through a hue angle-temperature correlation curve. The steady-state heat transfer and pressure drop performance relationship is experimentally obtained. The dynamic characteristics of unsteady heat transfer between the flow and heated surface are disclosed.
- Research Organization:
- Musashi Inst. of Tech., Tokyo (JP)
- OSTI ID:
- 20002453
- Report Number(s):
- CONF-990805--
- Country of Publication:
- United States
- Language:
- English
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