Inspection of brazed joints between cooling tube and heat sink of PFC for SST-1 tokamak by IR thermography technique

Chaudhuri, Paritosh; Santra, P.; Yeole, Sandeep; Prakash, Arun; Lachhvani, Lavkesh; Govindarajan, J.; Reddy, D. Chenna; Saxena, Y. C.

doi:10.1016/j.fusengdes.2005.05.001

Cited by 8 publications

(6 citation statements)

References 7 publications

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“…This type of temperature sensor is widely used as a mechanical switch for temperature control, usually, know as thermostats. [10] Few millimeters/minutes 0.1 °C Biomaterial [11,12] Few millimeters/seconds 0.1 °C Gas thermometers [13] Centimeters/minutes 0.001 K Acoustic [14][15][16][17][18] Centimeters/milliseconds 0.1 °C Electrical Thermocouple [19,20] 0.02-5 mm/50 ms-1 min 0.1 °C RTD [20,21] Few millimeters/minutes 0.001 °C Thermistor [13,21] 1-10 mm/20-300 s 0.01 °C (low span, 50 °C) Semiconductor junction [22] Few millimeters/minutes 0.5 °C Optical Optical fiber [23,24] millimeters 1D/millisecond 0.05-0.1 °C Thermoreflectance [25][26][27] 10 μm/down to ms 0.1-1.1 °C Liquid crystal [28][29][30][31] 2D/less than 1 s 0.5-0.9 °C Thermo-and photoluminescence [32][33][34][35] 2D observed temperature fields 1-31 °C Interferometry [36][37][38] 2D/milliseconds or less 2% (temperature in K) IR thermography [39][40][41] 40 μm-1 mm (2D)/down to ms 18 mK Temperature-sensitive paints (TSP) [41] 5 μm-1 mm (2D)/down to ms 0.4 °C 2.1.1.3 Gas thermometers Such mechanical thermometers are based on the variation in the pressure or volume when a fluid changes the temperature [13]. Basically, two types of fluid states are used, gas state or saturated state.…”

Section: Bimaterials Methodsmentioning

confidence: 99%

“…Optical techniques for temperature measurement are a set of emerging techniques that potentialize new applications hardly solved by mechanical or electrical temperature sensors. Their main advantages are noncontact temperature measurements, easy integration for obtaining high-resolution 2D temperature fields, fast response time and high immunity to electromagnetic interference [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41].…”

Section: Optical Temperature Measurement Techniquesmentioning

confidence: 99%

“…The working principle of this technique is the presence of infrared radiation detectors that can sense the infrared radiation from the body whose temperature is measured [39][40][41]. Sensors can be quantumtype or thermal type [13].…”

Section: Infrared Thermographymentioning

confidence: 99%

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Heat transfer coefficient: a review of measurement techniques

Moreira

Colmanetti

Tibiriçá

2019

J Braz. Soc. Mech. Sci. Eng.

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Heat transfer coefficient is a basic parameter used in the calculation of convective heat transfer problems. Due to the importance of the experimental measurements for the development of convective heat transfer, this review identifies, classifies and describes the experimental methods used for the measurement of heat transfer coefficient. The methods were classified into five major groups: (1) direct method, (2) transient method, (3) Wilson method, (4) heat/momentum/mass transfer analogy method and (5) boundary layer thickness method. Their applications, limitations and the reported accuracy were evaluated in the context of new developments in temperature and heat flux measurement techniques. Finally, this review provides criteria for the selection of the most suitable technique for measurements of heat transfer coefficient according to the aspects of spatial resolution, geometric scale, intrusiveness, fluid type, response time and accuracy. Keywords Heat transfer coefficient • Temperature • Heat flux • Convection • Experimental measurements List of symbols 1D One-dimensional 2D Two-dimensional A Surface area (m 2) A e Outer tube surface area (m 2) A i Inner tube surface area (m 2) A s Surface area (m 2) C e Thermal resistances outside the tube and the tube wall (K/W) (constant) C i Constant C f Fanning friction factor (-), C f = s V 2 ∕2 c Constant (-) c p Specific heat capacity (J/kg K) c p,i Specific heat capacity at constant pressure (J/ kg K) d Diameter (m) d e Outer tube diameter (m) d i Inner tube diameter (m) D m Mass diffusivity (m 2 /s) f Darcy friction factor (-), f = 4 ⋅ C f * Cristiano Bigonha Tibiriçá

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Section: Bimaterials Methodsmentioning

confidence: 99%

Section: Optical Temperature Measurement Techniquesmentioning

confidence: 99%

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Heat transfer coefficient: a review of measurement techniques

Moreira

Colmanetti

Tibiriçá

2019

J Braz. Soc. Mech. Sci. Eng.

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“…najwięcej opracowań w tym zakresie poświęconych jest głównie takim aspektom badawczym, jak: wykrywanie rozwarstwień, pustek lub obcych wtrąceń, detekcja pęknięć i uszkodzeń wywołanych uderzeniem [2]. Znacznie mniej uwagi poświęca się tej metodzie w zastosowaniu do badań różnego typu połączeń materiałowych [3,4]. nie znaleziono informacji o możliwości zastosowania termografii aktywnej do badań nieniszczących najczęściej spotykanych zakładkowych połączeń lutowanych.…”

Section: Wstępunclassified

Zastosowanie termografii aktywnej do badań nieniszczących połączeń lutowanych

Pawlak

Różański

Muzia

2013

Przegląd Spawalnictwa

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W artykule opisano zastosowanie termografii aktywnej do badań nieniszczących połączeń lutowanych. Omówiono metodologię badań oraz zastosowane stanowisko badawcze własnej konstrukcji. Uzyskane obrazy termograficzne próbek zostały porównane z wynikami badań radiograficznych. na podstawie wyników stwierdzono, że zaproponowana metoda badawcza może być z powodzeniem zastosowana do nieniszczącej analizy jakości zakładkowych połączeń lutowanych.

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“…[5][6][7] This paper will first acquire x-ray cross-sectional images using CT, with a heat exchanger as an object of inspection. X-ray is one of the most useful tools to detect inner defects that are invisible from the outside such as the brazing joints of the heat exchanger.…”

Section: Introductionmentioning

confidence: 99%

Template-based defect detection of a brazed heat exchanger using an x-ray image

Kim

2013

Opt. Eng

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Brazing joining is widely used in heat exchangers due to its effectiveness in increasing the efficiency of the heat-exchange process. When there is a defect in the brazing joints of a heat exchanger, damage occurs to the heat exchanger and heat efficiency is decreased. Therefore, to secure the quality of the brazing joints, the development of a highly reliable inspection method that can detect the defects in the brazing joints is required. We utilize an x-ray-using method to inspect the defects in brazing joints. First, x-ray cross-sectional images of the brazing joints are obtained by using computerized tomography (CT) technology. A cross-sectional image obtained from CT is more effective to detect the inner defects than the traditional transmitted x-ray image. Second, the acquired images are processed, and then template-matching-based defect detection algorithms of the brazing joints are proposed. Finally, a series of experiments to detect the brazing defects by using the proposed algorithm are performed concerning two types of brazing joint. The experimental results show that the proposed algorithms are suitable for defect detection of the brazing joint-based heat exchangers.

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Inspection of brazed joints between cooling tube and heat sink of PFC for SST-1 tokamak by IR thermography technique

Cited by 8 publications

References 7 publications

Heat transfer coefficient: a review of measurement techniques

Heat transfer coefficient: a review of measurement techniques

Zastosowanie termografii aktywnej do badań nieniszczących połączeń lutowanych

Template-based defect detection of a brazed heat exchanger using an x-ray image

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