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Design and Testing of an Automated System using Thermochromatic Liquid Crystals to Determine Local Heat Transfer Coefficients for an Impinging JetUsing thermochromatic liquid crystal to measure surface temperature, an automated transient method with time-varying free-stream temperature is developed to determine local heat transfer coefficients. By allowing the free-stream temperature to vary with time, the need for complicated mechanical components to achieve a step temperature change is eliminated, and by using the thermochromatic liquid crystals as temperature indicators, the labor intensive task of installing many thermocouples is omitted. Bias associated with human perception of the transition of the thermochromatic liquid crystal is eliminated by using a high speed digital camera and a computer. The method is validated by comparisons with results obtained by the steady-state method for a circular Jet impinging on a flat plate. Several factors affecting the accuracy of the method are evaluated.
Document ID
19980237450
Acquisition Source
Ames Research Center
Document Type
Thesis/Dissertation
Authors
Tan, Benjamin (California Univ. Los Angeles, CA United States)
Date Acquired
September 6, 2013
Publication Date
June 1, 1995
Subject Category
Fluid Mechanics And Heat Transfer
Funding Number(s)
CONTRACT_GRANT: NCC2-374
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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