Relevant bibliographies by topics / Thermo-chromic liquid crystal

Academic literature on the topic 'Thermo-chromic liquid crystal'

Author: Grafiati
Published: 10 March 2023

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Journal articles on the topic "Thermo-chromic liquid crystal"

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Cho, Hyunmin, Jinhyeong Kwon, Inho Ha, Jinwook Jung, Yoonsoo Rho, Habeom Lee, Seungyong Han, Sukjoon Hong, Costas P. Grigoropoulos, and Seung Hwan Ko. "Mechano-thermo-chromic device with supersaturated salt hydrate crystal phase change." Science Advances 5, no. 7 (July 2019): eaav4916. http://dx.doi.org/10.1126/sciadv.aav4916.

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Active control of transparency/color is the key to many functional optoelectric devices. Applying an electric field to an electrochromic or liquid crystal material is the typical approach for optical property control. In contrast to the conventional electrochromic method, we developed a new concept of smart glass using new driving mechanisms (based on mechanical stimulus and thermal energy) to control optical properties. This mechano-thermo-chromic smart glass device with an integrated transparent microheater uses a sodium acetate solution, which shows a unique marked optical property change under mechanical impact (mechanochromic) and heat (thermochromic). Such mechano-thermo-chromic devices may provide a useful approach in future smart window applications that could be operated by external environment conditions.
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Cabrera, Ivan, Valeri Krongauz, and Helmut Ringsdorf. "Photo- and Thermo-Chromic Liquid Crystal Polymers with Spiropyran Groups." Molecular Crystals and Liquid Crystals Incorporating Nonlinear Optics 155, no. 1 (February 1988): 221–30. http://dx.doi.org/10.1080/00268948808070366.

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Murata, Hiroyuki, Hideyuki Oka, and Kazuyoshi Harumi. "Visualization of Riser Wall Temperature in Circulating Fluidized Bed with Thermo-Chromic Liquid Crystal." Journal of The Japan Institute of Marine Engineering 49, no. 5 (2014): 674–81. http://dx.doi.org/10.5988/jime.49.674.

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OKANO, Kazuki, and Hiroshi MIZUNUMA. "S051045 Visualization of solidified reaction of photopolymer using micro-encapsulated thermo-chromic liquid crystal." Proceedings of Mechanical Engineering Congress, Japan 2013 (2013): _S051045–1—_S051045–4. http://dx.doi.org/10.1299/jsmemecj.2013._s051045-1.

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Baba, Madoka, Yukihisa Suzuki, Masao Taki, Kaori Fukunaga, and Soichi Watanabe. "Three-dimensional Measurement of Electromagnetic Power Absorption in a Phantom with Thermo-chromic Liquid Crystal." IEEJ Transactions on Fundamentals and Materials 127, no. 8 (2007): 467–72. http://dx.doi.org/10.1541/ieejfms.127.467.

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KODAMA, Takashi, and Shinsuke MOCHIZUKI. "1216 Measurement of Wall Shear Stress with Sublayer Thin Plate of Thermo-Chromic Liquid Crystal." Proceedings of Conference of Chugoku-Shikoku Branch 2015.53 (2015): _1216–1_—_1216–2_. http://dx.doi.org/10.1299/jsmecs.2015.53._1216-1_.

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TOMITA, Yousuke, Koji TORIYAMA, Shigeru TADA, Koichi ICHIMIYA, and Shumpei FUNATANI. "D123 Effects of wavelength spectrum of the scattered light from the thermo-chromic liquid crystal for measurable temperature range." Proceedings of the Thermal Engineering Conference 2014 (2014): _D123–1_—_D123–2_. http://dx.doi.org/10.1299/jsmeted.2014._d123-1_.

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KOKUI, Daisuke, Koji TORIYAMA, Shigeru TADA, Koichi ICHIMIYA, and Shumpei FUNATANI. "Evaluate of uncertainty for temperature distribution measurement method using ratio of scattered light intensities from thermo-chromic liquid crystal." Proceedings of Yamanashi District Conference 2017 (2017): 454. http://dx.doi.org/10.1299/jsmeyamanashi.2017.454.

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Kokui, Daisuke, Koji Toriyama, Shigeru Tada, Koichi Ichimiya, and Shumpei Funatani. "A Novel Measurement Method of Temperature Distribution Utilizing the Spectrum Intensity of Narrow Band Wavelengths of Thermo-chromic Liquid Crystal." Proceedings of the Thermal Engineering Conference 2018 (2018): 0185. http://dx.doi.org/10.1299/jsmeted.2018.0185.

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Kishida, Yosuke, and Munehiko Hiwada. "B133 Simultaneous measurement of temperature and velocity in the case of convective heat transfer with micro-encapsulated thermo-chromic liquid crystal." Proceedings of the Thermal Engineering Conference 2011 (2011): 43–44. http://dx.doi.org/10.1299/jsmeted.2011.43.

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Dissertations / Theses on the topic "Thermo-chromic liquid crystal"

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MAIUOLO, FRANCESCO. "Experimental Analysis of Gas Turbine Airfoil Leading Edge Cooling Systems." Doctoral thesis, 2013. http://hdl.handle.net/2158/794585.

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This PhD research project and the findings of its intensive experimental analysis regard various internal leading edge cooling systems designed both for aircraft engines and heavy duty gas turbines. In the last decades, research in the area of such power systems has mainly focused on the improvement of the overall efficiency and power output, making sure the strict legislative requirements which regulate pollutant emissions (particularly NOx) are observed. These aspects are related to turbine inlet temperatures (TIT) which, in recent years, have reached values far above the acceptable material temperatures of the components directly exposed to hot gases. One of the most thermally loaded regions is represented by the leading edge of the turbine blades in which more complex cooling schemes are required to keep the metal temperature at levels consistent with the design life. The present work regards an experimental survey on different scaled up leading edge cooling schemes aimed at measuring the heat transfer coefficient (HTC) inside the leading edge cavity of high pressure gas turbine blades. Several experimental models were designed in order to meet the requirements of the industrial partners, in fact a modular approach has been used to test four different external leading edge profiles with different internal impingement geometries. The complete leading edge cooling scheme has been replicated which is, in particular, composed of ”cold bridge” systems with different jet arrangements (number of jets, shape, jet-to-jet pitches) and coolant extraction from the cavity, with different extraction hole arrays, in order to underline the influence of the coolant extraction on the internal heat transfer distribution. Detailed two-dimensional heat transfer coefficient maps have been obtained by means of a transient technique, using a TLC (Thermo-chromic Liquid Crystals) thermography in a narrow band formulation. The experiments have been performed in an engine similitude in terms of impingement jet Reynolds number, which is the main driving parameter in these internal cooling systems. The study has been carried out within the European Research Project ERICKA (Engine Representative Internal Cooling and Knowledge Applications), part of the European Union Framework Programme 7, whose overall objective is to provide a means for improving the existing turbine blade cooling technology, thus reducing the turbine blade cooling mass-flow. In this scientific framework, the University of Florence is involved in Work Package 2 which focuses on the stationary experiments in leading edge impingement cooling systems, together with its industrial partners AVIO and ALSTOM Switzerland.
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Conference papers on the topic "Thermo-chromic liquid crystal"

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Kwon, Jinhyeong, Hyunmin Cho, Inho Ha, Habeom Lee, Sukjoon Hong, and Seung Hwan Ko. "Mechano-thermo-chromic device with supersaturated salt hydrate crystal for next-generation smart window applications." In Emerging Liquid Crystal Technologies XV, edited by Liang-Chy Chien and Dirk J. Broer. SPIE, 2020. http://dx.doi.org/10.1117/12.2542731.

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Kodama, Takashi, and Shinsuke Mochizuki. "Measurement of the Wall Shear Stress With Sublayer Thin Plate of Thermochromic Liquid Crystal." In ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ajkfluids2015-25474.

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New optical method for measurement of the local wall shear stress has been developed by using thermo-chromic liquid crystal temperature measurement based on hue [1], [2] of the camera view. The flow field is the fully developed turbulent channel flow. Thin film made of thermo-chromic liquid crystal is placed on the wall. A rectangular shaped obstacle is glued on the film. The obstacle is within a region of buffer layer with height from the wall. Temperature of the film and the obstacle are slightly raised by a heater below the wall. The air flow makes non-uniform temperature distribution and non-uniform color distribution appears on the surface of the film. Relations between hue and local skin friction coefficient were examined in a turbulent air channel flow. It is indicated that a certain hue of a point is varying linearly against the corresponding local skin friction coefficient.
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Kokui, Daisuke, K. Toriyama, S. Tada, Koichi Ichimiya, and Shumpei Funatani. "TEMPERATURE DISTRIBUTION MEASUREMENT USING RATIO OF SCATTERED LIGHT INTENSITIES FROM THERMO-CHROMIC LIQUID CRYSTAL: UNCERTAINTY EVALUATION." In International Heat Transfer Conference 16. Connecticut: Begellhouse, 2018. http://dx.doi.org/10.1615/ihtc16.tpm.024087.

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Iwahashi, Toshihide, Kazuhiro Matsui, Tang Tianhan, Takashi Azuma, Akira Sasaki, Shu Takagi, Yoichiro Matsumoto, et al. "Visualization of 3D temperature distribution caused by exposure of HIFU with thermo-chromic liquid crystal phantom." In 2015 IEEE International Ultrasonics Symposium (IUS). IEEE, 2015. http://dx.doi.org/10.1109/ultsym.2015.0039.

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Tohid, Usama, Arturo Pacheco-Vega, Rodion Tikhoplav, and Marcos Ruelas. "Fluid Flow and Heat Transfer Simulations of the Cooling-Water Channel in a Tera-Hertz Radiation Detector." In ASME 2012 10th International Conference on Nanochannels, Microchannels, and Minichannels collocated with the ASME 2012 Heat Transfer Summer Conference and the ASME 2012 Fluids Engineering Division Summer Meeting. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/icnmm2012-73272.

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Detailed numerical simulations have been carried out to find the velocity and temperature fields of a rectangular channel with large aspect-ratio. The channel under analysis is aimed to cool a thermo-chromic liquid crystal material (TLC) that is able to capture laser irradiation in the terahertz range. The overall objective of the cooling system is to maintain a nearly-homogeneous temperature of the TLC layer that is not exposed to the direct laser irradiation. The fluid flow and heat transfer simulations are carried out on the basis of three-dimensional versions of the Navier-Stokes equations, along with the energy equation, for an incompressible flow, to determine values of velocity, pressure and temperature inside the channel under different operating conditions. These values are then used to find, from a specific set, the value of the channel height that allows for the most uniform temperature distribution within the expected operating conditions. Results from this analysis indicate that, for all the inlet velocities considered, there is a common value of the channel height, that represents the optimum.
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Panda, Rajesh Kumar, and B. V. S. S. S. Prasad. "Effect of Thermal Conductivity on Heat Transfer From a Flat Plate With Combined Impingement and Film Cooling." In ASME 2012 Gas Turbine India Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gtindia2012-9669.

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The effect of solid thermal conductivity on conjugate heat transfer from a flat plate with combined impingement and film cooling is studied both experimentally and computationally. One side of the plate is exposed to hot mainstream, while the other side experiences impinging air jets. A geometric configuration with multiple staggered rows of cylindrical film holes and a matrix of impingement holes is considered. In the experiments a thermo-chromic liquid crystal (TLC) technique is used to measure the surface temperature. For the purpose of computations, the physical domain is meshed with very fine sized hexahedral and tetrahedral grids suitable for the finite volume method. Grid refinement is carried out using GCI method and SST κ-omega RANS equations are used for turbulence modeling. Three blade materials: A - with k = 0.2W/m K, B - with k = 1.5W/m K and C - with k = 15W/m K and three blowing ratios, M = 0.6, 1.0 and 1.6 are considered for the conjugate heat transfer study. A good agreement of effectiveness distribution on the interaction surface is found between the measured and the computations. On the interaction surface, heat flux values are the lowest for material A and progressively increase with increasing thermal conductivity. However the effectiveness values vary significantly for material A in the stream-wise direction. The Nusselt number on the other hand differs only slightly among different materials.
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Narzary, Diganta, Kevin Liu, Je-Chin Han, Shantanu Mhetras, and Kenneth Landis. "Turbine Blade Tip Film-Cooling and Heat Transfer Measurements at High Blowing Ratios." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-25793.

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Film-cooling and heat transfer characteristics of a gas turbine blade tip with a suction side rail was investigated in a stationary 3-blade rectilinear cascade. Mounted at the end of a blow-down facility the cascade operated at inlet and exit Mach numbers of 0.29 and 0.75, respectively. The rail was marginally offset from the suction side edge of the tip and extended from the leading to the trailing edge. A total of 17 film-cooling holes were placed along the near-tip pressure side surface and 3 on the near-tip leading edge surface with the objective of providing coolant to the tip. The tip surface itself did not carry any film-cooling holes. Relatively high blowing ratios of 2.0, 3.0, 4.0, and 4.5 and three tip gaps of 0.87%, 1.6%, and 2.3% of blade span made up the test matrix. Pressure sensitive paint (PSP) and Thermo-Chromic Liquid Crystal (TLC) were the experimental techniques employed to measure film-cooling effectiveness and heat transfer coefficient, respectively. Results indicated that when the tip gap was increased, film-cooling effectiveness on the tip surface decreased and heat transfer to the tip surface increased. On the other hand, when the blowing ratio was increased, film effectiveness increased but the effect on heat transfer coefficient was relatively small. The highest heat transfer coefficient levels were found atop the suction side rail, especially in the downstream two-thirds of its length whereas the lowest levels were found on the tip floor in the widest section of the blade.
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Zhang, Luzeng, Dong H. Lee, Juan Yin, and Hee Koo Moon. "The Effect of Axisymmetric Profile on Turbine Blade Platform Heat Transfer Distribution." In ASME Turbo Expo 2013: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/gt2013-94335.

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Flow field near the turbine blade platform is very complex due to the secondary flow motions such as horseshoe vortices, passage vortices and endwall cross flows. It is therefore extremely difficult to predict the platform heat transfer distribution. As the secondary flows are largely affected by platform profile/shape, a number of investigators have studied different platform profiles to minimize aerodynamic loss and heat load. Understanding of the platform heat transfer has become especially critical in recent years, because of firing temperature increase and low NOx combustion requirement, as it is directly related to turbine durability. Three different axisymmetric platform profiles were designed and experimentally studied: flat profile, dolphin nose profile and shark nose profile. All of them were based on the existing engine hardware designs. The measurements were conducted in a high-speed linear cascade, which consisted of five blades and six flow passages. The test platforms were made of FR4 material and painted with Thermo-chromic Liquid Crystal (TLC). The test article was kept in the plenum located under the cascade at the pre-test condition. At the start of each test, the test blade/article was inserted into the cascade rapidly and then two CCD cameras recorded the color changes of the TLC on the platform surface. Engine representative Reynolds numbers were studied from 300,000 to 600,000 and the corresponding inlet Mach numbers were ranged from 0.12 to 0.24. The upstream section of the flat profile platform showed a typical flat plate heat transfer pattern with boundary layer development. The shark-nose and dolphin-nose platforms resulted in lower heat transfer coefficients on the upstream region compared to that for the flat profile, and the peak values moved slightly downstream from the leading edge due to possibly different secondary flow patterns. The heat transfer rate increased with increased Reynolds number for all three platform shapes, while the flat profile showed a higher increase rate. Zone averaged heat transfer distributions in addition to local values were also presented to show the effect of platform profile. In general, the flat profile platform resulted in a higher overall heat transfer rate than that for the other two profile platforms, which suggested that a good design of contoured profile platform could reduce the heat load and aerodynamic loss in gas turbine blade.
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Massini, Daniele, Bruno Facchini, Mirko Micio, and Riccardo Da Soghe. "Experimental Investigation on Swirl and Heat Transfer Within a Rotor-Stator Cavity." In ASME Turbo Expo 2016: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/gt2016-57608.

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A rotating test rig, reproducing a rotor-stator cavity with an axial admission system, has been exploited for an experimental investigation on the internal flow field and its effect on heat transfer on the stator side. Working conditions were varied in a wide range of rotating velocities and superposed mass flow rates. 2D PIV flow measurements were performed in order to obtain a radial distribution of the tangential velocity, results were used to validate numerical simulations aimed at understanding the admission system effect on the swirl distribution. Heat transfer coefficient distribution along the stator disk has been evaluated performing a steady state technique exploiting Thermo-chromic Liquid Crystals (TLC). Tests have been performed varying the superposed mass flow rate up to reaching the condition of cavity completely sealed, further increase of the mass flow rate showed to reduce the effect of the rotation. Working conditions were set in order to investigate cases missing in open literature, however few tests performed in similarity with other researches provided comparable results.
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Abe, Ryuta, Yuji Tasaka, Ichiro Kumagai, Yuichi Murai, and Takatoshi Yanagisawa. "Dynamics of Cell Pattern Formation in Internally Heated Convection Viewed From Local to Global Particle Image Thermometry." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-11014.

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Internally heated convection is a fundamental phenomenon, largely governing the dynamics of natural systems such as the atmosphere and Earth’s mantle. It also plays an important role in industrial applications. Here we have investigated the separation of the top thermal boundary layer in order to understand the cell enlargement and the dynamics of the cell pattern formation. To observe the development of the thermal boundary layer non-invasively, the temperature distribution of the vertical plane in a convective cell was visualized by particle image thermometry (PIT). Micro-encapsulated thermo-chromic liquid crystals (TLCs) were seeded in the test fluid and illuminated by a white light sheet, and scattering light was taken by a digital camera. For quantitative temperature measurement, we have calibrated the temperature changes with the variation of the hue color component. The development of the thermal boundary layer with respect to the Rayleigh number has been investigated. The results show the local Rayleigh number determined from the thickness of the thermal boundary layer, which increases towards a critical local Rayleigh number ∼600.
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