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

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1

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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2

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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3

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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4

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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5

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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6

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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7

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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8

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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9

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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10

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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11

TORIYAMA, Koji, Shigeru TADA, Koichi ICHIMIYA, Shumpei FUNATANI, and Yosuke TOMITA. "Expansion of the measurable range in temperature measurement using a thermo-chromic liquid crystal (A method focused to the spectrum intensity in narrow-band wavelengths)." Transactions of the JSME (in Japanese) 81, no. 830 (2015): 15–00090. http://dx.doi.org/10.1299/transjsme.15-00090.

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12

Illyas, S. M., A. MuthuManokar, and A. E. Kabeel. "Experimental and Computational Study on Effect of Vanes on Heat Transfer and Flow Structure of Swirling Impinging Jet." Journal of Applied Fluid Mechanics 16, no. 2 (February 1, 2023): 205–21. http://dx.doi.org/10.47176/jafm.16.02.1296.

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The study focuses on heat transfer performance and flow structure associated with swirling jet on a flat target surface. The analysis is carried out with helicoid inserts of swirl number S = 1.3 by varying the number of vanes with Reynolds number between 11200 and 35600. The comparison of swirling jet with circular jet is carried out on its heat transfer performance. The heat transfer and flow structure are visualized using thermo-chromic liquid crystal sheet and oil film technique respectively. The numerical simulation is also performed at Re = 24700 for H/D distance between 1 and 4 using computational fluid dynamics. The heat transfer results reveal that the presence of axial recirculation zone at Re = 29800 and 35600 for the triple helicoid affects the uniformity of heat transfer distribution at 0 < X/D < 1.5 at H/D = 3. The axial component of velocity with respect to swirling jet is less than zero in the stagnation area and it increases at 0.57 < r/D < 0.97 for single vane and 0.63 < r/D < 0.97 for double and triple vanes. While the steep increase in tangential velocity of the triple vane jet is apparent at 0 < r/D < 0.5 at H/D = 2 and 3, the maximum value of point radially shifts inward towards the jet. The location of maximum turbulent kinetic energy approaching the surface at about r/D = 0.9 - 1.2 which characterizes the swirling jet at H/D = 2.
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13

Bednarz, Tomasz P., Chengwang Lei, and John C. Patterson. "Various aspects of camera settings and image processing in the calibration of thermo-chromic liquid crystals for accurate particle image thermometry measurements." Journal of Visualization 13, no. 3 (April 30, 2010): 241–50. http://dx.doi.org/10.1007/s12650-010-0038-x.

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14

Kumar, Rishi. "Thermo-Chromic Response of Polymer Stabilized Cholesteric Liquid Crystal for Thermal Imaging." Non-Metallic Material Science 1, no. 2 (October 31, 2019). http://dx.doi.org/10.30564/omms.v1i2.849.

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Cholesteric liquid crystal (Ch-LC) exhibits many remarkable optical properties due to formation of a macroscopic helical structure. A low amount of monomer (5wt.%) is dispersed into cholesteric liquid crystal and get polymerized under UV radiations to form polymer stabilized cholesteric texture (PSCT). The thermo-chromic response made this device suitable for the developing applications in thermal imaging. Temperature based measurements of PSCT exploits the key property of some polymer stabilized cholesteric liquid crystals (PSCLC) to reflect definite colors at specific temperatures. The selective color of PSCT texture shifts with raise in temperature from 30oC to 85oC, which can be utilized in thermal imaging applications.
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15

Rathor, Yogendra, and K. R. Aharwal. "Experimental Investigation of Local Heat Transfer Measurement Having Inclined Discrete Ribs of Solar Air Heater Duct Using LCT Technique." Journal of Thermal Science and Engineering Applications 14, no. 2 (November 17, 2021). http://dx.doi.org/10.1115/1.4052597.

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Abstract The steady-state experiment using liquid crystal thermography has been conducted for the analysis of Nusselt number distribution over the absorber surface of solar air heater (SAH) duct having a gap with the staggered arrangement in inclined rib geometry to recuperate its thermal performance. The heat transfer experiment is performed with uniform heat flux and thermo-chromic liquid crystal (TLC) is utilized to show the temperature distribution profile over the ribbed surfaces of the rectangular duct of aspect ratio of 5. The colored pattern image of TLCs was acquired using a 3CCD (charged couple device) camera and exported to a Tagged Image File Format (TIFF) file format using frame grabbing SOFTWARE SAPERALT which was further processed to get hue, saturation, intensity (HSI) values. The flow parameters considered in this present investigation are Re, d/W, and g/e varied from 4000 − 12,500, 0.15 − 0.45, and 1 − 4, respectively. Experiments has been performed with fixed P/e, r/e, p′/P, α, and e/Dh of 10, 2, 0.6, 60 deg, and 0.0303, respectively. The influence of relative gap position and relative gap width on flow pattern has been analyzed. The maximum augmentation in Nu and f over the smooth duct was obtained as 4.01 and 4.28 times, respectively, at the optimum value of d/W = 0.35 and g/e = 2 under similar flow conditions. The maximum value of THPP obtained at d/W and g/e of 0.35 and 2, respectively, and Reynolds number of 12,445.
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