Author: Michael Robert AndersonPublisher:
ISBN:
Category :
Languages : en
Pages : 624
Book Description
Thermochromic Liquid Crystal Thermography
Author: Michael Robert AndersonPublisher:
ISBN:
Category :
Languages : en
Pages : 624
Book Description
Thermography of Atomized Droplets in Flight Using Thermochromic Liquid Crystal (TLC)
Author: Hai HuLiquid Crystal Thermography Studies in Water Pool Boiling at Subatmospheric Pressures
Author: Kiran TalariPublisher:
ISBN:
Category : Liquid crystals
Languages : en
Pages : 73
Book Description
A pool boiling experimental facility has been designed and built to investigate nucleate pool boiling in water under sub atmospheric pressure. Liquid crystal thermography, a non intrusive technique, is used for the determination of surface temperature distributions. This technique uses encapsulated liquid crystals that reflect definite colors at specific temperatures and viewing angle. Design of the test section is important in this experimental study. Since a new TLC is required for every new set of test conditions, a permanently sealed test section is not an option. The real challenge is to design a leak proof test section which is flexible so that it can be taken apart easily. A plexiglass test section, including a top chamber with an internal volume of 60.9 x 60.9 x 66.4 mm and a bottom plate of 5.5mm thickness is designed and assembled together using quick grips. In the test section, water is boiled using 85.0mm x 16.0mm and 0.050mm thick Fecralloy® as the heating element. The TLC sheet is attached to the bottom plate and the heating element is placed on top of TLC so that the temperature distribution of the heating element during boiling can be interpreted from TLC. A camera system fast enough to capture the thermal response of the TLC and an arrangement to capture both hue of the TLC and growth of the bubble on the same frame has been designed and successfully used. This system allowed recording of position, size and shape of the bubble with synchronized surface temperature. In order to get hue vs. temperature relation, in-situ calibration of the TLC is performed for each test condition with the present experimental setup and lighting conditions. It is found that the calibration curve of the TLC at atmospheric pressure is different from the calibration curve of the same TLC at subatmospheric pressures. The maximum temperature difference between the two curves for the same hue is found to be only 0.6°C. The experiment is run at four different test conditions of subatmospheric pressure and low heat flux. It is run at system pressures of 6.2kPa (0.89Psi) and 8.0kPa (1.16Psi) with a constant heat flux of 1.88kW/m2 and 2.70kW/m2, and a constant heat flux of 2.70kW/m2, 3.662kW/m2 and 4.50 kW/m2 respectively. Analysis of nucleating surface temperatures using thermochromic liquid crystal technique is performed for these test conditions and the bubble dynamics is studied. The temperature distribution is quite varied in each case and the temperature is at its maximum value at the center of the bubble and it decreases radially from the center. The dry spot observed during the experiments indicates that the process of evaporation of the microlayer is dominant at subatmospheric pressures. It is observed that at very low pressure and heat flux the bubble growth is accompanied by the neck formation. Boiling parameters such as bubble frequency, bubble size and contact are also analyzed and a summary of these results for four different test conditions is presented and the relevant differences between the cases are discussed and the effect of increase in pressure and heat flux is noted.
Lock-in Thermography
Author: Otwin BreitensteinPublisher: Springer Science & Business Media
ISBN: 3642024173
Category : Science
Languages : en
Pages : 260
Book Description
This is the first book on lock-in thermography, an analytical method applied to the diagnosis of microelectronic devices. This useful introduction and guide reviews various experimental approaches to lock-in thermography, with special emphasis on the lock-in IR thermography developed by the authors themselves.
An Experimental Investigation of the Effect of Freestream Turbulence on Film Cooling Using Thermochromic Liquid Crystal Thermography
Author: James Edward MayhewTheoretical, Computational, and Experimental Solutions to Thermo-Fluid Systems
Author: Muthukumar PalanisamyPublisher: Springer Nature
ISBN: 9813341653
Category : Technology & Engineering
Languages : en
Pages : 505
Book Description
This book presents select proceedings of the International Conference on Innovations in Thermo-Fluid Engineering and Sciences (ICITFES 2020). It covers topics in theoretical and experimental fluid dynamics, numerical methods in heat transfer and fluid mechanics, different modes of heat transfer, multiphase flow, fluid machinery, fluid power, refrigeration and air conditioning, and cryogenics. The book will be helpful to the researchers, scientists, and professionals working in the field of fluid mechanics and machinery, and thermal engineering.
A System for Making Temperature Measurements Using Thermochromic Liquid Crystals
Author: Dino John FarinaLiquid Crystals
Author: Gregory Philip CrawfordPublisher: World Scientific
ISBN: 981277887X
Category : Science
Languages : en
Pages : 514
Book Description
1. Liquid crystals: a unique phase of matter -- 2. Medical displays -- 3. Liquid crystals in spectroscopy, microscopy and hyperspectral imaging -- 4. Liquid crystal biosensors -- 5. Liquid crystak lasers -- 6. Biomimicking with liquid crystals -- 7. Actuators and delivery systems
Particle Image Velocimetry
Author: Markus RaffelPublisher: Springer Science & Business Media
ISBN: 3540723072
Category : Technology & Engineering
Languages : en
Pages : 460
Book Description
This immensely practical guide to PIV provides a condensed, yet exhaustive guide to most of the information needed for experiments employing the technique. This second edition has updated chapters on the principles and extra information on microscopic, high-speed and three component measurements as well as a description of advanced evaluation techniques. What’s more, the huge increase in the range of possible applications has been taken into account as the chapter describing these applications of the PIV technique has been expanded.
Author: Darby Burgess Makel