Journal ArticleDOI
Liquid Crystal Thermography for Heat Transfer Measurement in Hypersonic Flows: A Review
G. T. Roberts,R. A. East +1 more
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In this article, the authors defined a substrate specific heat capacity, which is defined as the capacity of a substrate to transfer heat from a liquid crystal pitch of helical structure to a substrate.Abstract:
Nomenclature substrate specific heat capacity, Jkg^K" fin leading-edge diameter, 10 mm hue;Eq. (7) heat transfer coefficient, Wm~K" intensity; Eq. (10) substrate thermal conductivity, Wm^K" mean refractive index of liquid crystal pitch of helical structure, m convective heat flux, Wm~ red, green, and blue coordinates red, green, and blue chromaticity coordinates saturation; Eq. (9) model surface temperature, K adiabatic wall temperature, K model initial temperature, K time, s semi-infinite penetration depth, m thermal diffusivity, k/ pc, ms~ c D H h / k n P qu) R,G, B r, g, b S T Ta 7} t x* a y A = wavelength of reflection, m p = substrate density, kgm~ (/) angle of illuminationread more
Citations
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Journal ArticleDOI
Liquid crystal measurements of heat transfer and surface shear stress
Peter T. Ireland,Terry V. Jones +1 more
TL;DR: A review of the use of liquid crystals in research with a special emphasis on recent developments in the field is given in this paper, where the reader is provided with an up-to-date background in this measurement technology and allow the researcher to decide whether liquid crystals would be suitable in specific applications.
Journal ArticleDOI
Digital particle image thermometry/velocimetry: a review
TL;DR: Digital particle image thermometry/velocimetry (DPIT/V) is a relatively new methodology that allows for measurements of simultaneous temperature and velocity within a two-dimensional domain this article.
Journal ArticleDOI
Investigation of the double ramp in hypersonic flow using luminescent measurement systems
TL;DR: In this paper, a double ramp model placed in hypersonic flow at freestream Mach number of 5 was studied using colour Schlieren and luminescent paints consisting of anodized aluminium pressure sensitive paint (AA-PSP) and the temperature-sensitive paint (TSP) technique.
Proceedings ArticleDOI
Aerothermodynamic measurement and prediction for a modified orbiter at Mach 6 and 10 in air
TL;DR: In this paper, heat transfer rate distributions measured laterally over the windward surface of an orbiter-like configuration using thin-film resistance heat-transfer gauges and globally using the newly developed relative intensity, two-color thermographic phosphor technique are presented for Mach 6 and 10 in air.
Book ChapterDOI
Advances in temperature measurement
TL;DR: In this article, the principal techniques available for the measurement of temperature, describing the physical phenomena exploited, the temperature range of use, equipment required, and typical applications are described, as well as developments in the areas of instrumentation capability and technique.
References
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Journal ArticleDOI
Investigation of flow and heat transfer in corrugated passages—I. Experimental results
TL;DR: In this paper, the authors describe the method of applying thermochromic liquid crystals and true-colour image processing to give local Nusselt number distribution over the surface and average Nu, both of quantitative reliability; a careful uncertainty analysis is also presented.
Proceedings ArticleDOI
A New Hue Capturing Technique for the Quantitative Interpretation of Liquid Crystal Images Used in Convective Heat Transfer Studies
TL;DR: In this paper, a color-capturing technique for the quantitative interpretation of liquid crystal images used in convective heat transfer studies is presented, which is highly applicable to the surfaces exposed to convective heating in gas turbine engines.
Journal ArticleDOI
The response time of a surface thermometer employing encapsulated thermochromic liquid crystals
Peter T. Ireland,Terry V. Jones +1 more
TL;DR: In this paper, a micro-encapsulated chiral nematic thermochromic liquid crystal was applied to the surface of a color display to measure the response of the display to a rapidly increasing surface temperature.
Journal ArticleDOI
Illuminant invariant calibration of thermochromic liquid crystals
TL;DR: In this article, a video-based system is described for using thermochromic liquid crystals (TLCs) to make highly accurate, full-field, surface temperature measurements, independent of the illuminant spectrum, background lighting, angle of incidence, and optical path.
Journal ArticleDOI
Liquid crystal methods for studying turbulent heat transfer
TL;DR: In this article, five methods of using narrowband liquid crystals for the measurement of local heat transfer coefficients are reviewed, including the heated-coating method, three variations of the transient method (preheated wall transient, duct-insertion technique, and shroud-heating technique), and a uniform coating method.