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- 검색키워드
- 저자 : Arunkumar Seshadri (검색결과 2 건)
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Arunkumar Seshadri,Swetha Mahadevan,Venkatesan Muniyandi 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.5
The measurement and study of liquid films in the case of two phase flows is significant in many heat transfer and mass transfer applications, such as chemical process industries, micro reactors, coating processes and in boilers. The focus of the present study was to measure and characterize the thickness of the liquid films for various two phase flow regimes in conventional and in mini channels using a non-intrusive technique. Experiments were performed on tubes of diameters 0.6, 1.5, 2.6 and 3.4mm. The superficial velocities of gas and liquid are in the range of 0.01-50 and 0.01-3m/s, respectively. The flow patterns were recorded with a high speed camera. A method to determine the two phase flow velocity using image registration has been discussed. Morphological processing and gray scale analysis were used to determine the liquid film thickness and characterize the flow regimes. The flow patterns identified are bubbly, dispersed bubbly, slug, slug-annular, wavy-annular, stratified, and annular. The flow regimes were validated with flow maps available in the literature. The liquid film thickness was identified by distance transform technique in image processing. The magnitude of film thickness varied with liquid and gas flow velocities. The film thickness was represented in terms of capillary number. The variation in film thickness along the length of the flow regime has been discussed. A relation between the liquid film thicknesses measured using the non-intrusive image processing technique and capillary number for the conventional and mini tubes is proposed based on the analysis. It is concluded from the proposed correlation that the variation in liquid film thickness is different for conventional and mini channels because of the effect of inertial dominance in conventional channels and viscous dominance in mini channels.
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Development of Cr cold spray – coated fuel cladding with enhanced accident tolerance
Martin Seve cek,Anil Gurgen,Arunkumar Seshadri,Yifeng Che,Malik Wagih,Bren Phillips,Victor Champagne,Koroush Shirvan 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.2
Accident-tolerant fuels (ATFs) are currently of high interest to researchers in the nuclear industry and ingovernmental and international organizations. One widely studied accident-tolerant fuel concept ismultilayer cladding (also known as coated cladding). This concept is based on a traditional Zr-based alloy(Zircaloy-4, M5, E110, ZIRLO etc.) serving as a substrate. Different protective materials are applied to thesubstrate surface by various techniques, thus enhancing the accident tolerance of the fuel. This studyfocuses on the results of testing of Zircaloy-4 coated with pure chromium metal using the cold spray (CS)technique. In comparison with other deposition methods, e.g., Physical vapor deposition (PVD), lasercoating, or Chemical vapor deposition techniques (CVD), the CS technique is more cost efficient due tolower energy consumption and high deposition rates, making it more suitable for industry-scale production. The Cr-coated samples were tested at different conditions (500 C steam, 1200 C steam, andPressurized water reactor (PWR) pressurization test) and were precharacterized and postcharacterizedby various techniques, such as scanning electron microscopy, Energy-dispersive X-ray spectroscopy(EDX), or nanoindentation; results are discussed. Results of the steady-state fuel performance simulationsusing the Bison code predicted the concept's feasibility. It is concluded that CS Cr coating has highpotential benefits but requires further optimization and out-of-pile and in-pile testing
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