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Impact of Perlator on the cooling liquid flow and hottest point temperature of superconducting windings in HTS transformer

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Superconductivity 2022年第3期3卷 97-105页

作者： Mahdi Mahamed Mohammad Yazdani-Asrami Vahid Behjat Akbar Yazdani mojtaba sharifzadeh Department of Electrical Engineering Azarbaijan Shahid Madani UniversityTabrizIran Propulsion Electrification&Superconductivity GroupJames Watt School of EngineeringUniversity of GlasgowGlasgowUK Department of Applied Sciences University of Quebec at ChicoutimiChicoutimiCanada Thermal Power Plant Research Center TabrizIran Fondazione Bruno Kessler TrentoItaly

The generated heat by the superconducting windings and the other parts such as current leads in transformer increases the hottest point temperature(HPT)and causes the high temperature superconducting(HTS)windings to *** to the properties of superconducting windings,reducing the HPT is of critical importance for the stable operation of the HTS *** cooling system of HTS transformers,not only provides the cryogenic temperature for the proper operation of the superconductors but also is responsible for dissipating the generated heat by the *** this paper,the effect of the angle of inlet pipes in cooling system was *** was a simple and effective solution which increases the heat transfer in liquid *** was shown that inlet angle has a significant effect on the flow turbulence and the windings *** Perlator is used as a lattice sheet which is installed inside the inlet valve and increases the turbulence of inlet flow of liquid nitrogen to increase heat transfer and reduce *** thermal analysis is obtained by finite element method using ANSYS Fluent *** influence of changing the inlet pipe angle and different structure of Perlator on heat transfer was investigated.

关键词： Cryogenic temperature Finite element method Heat transfer Perlator Superconducting transformer Turbulences

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COVID-19 and congenital heart disease:a case series of nine children

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World Journal of Pediatrics 2021年第1期17卷 71-78页

作者： Elmira Haji Esmaeil Memar Babak Pourakbari mojtaba Gorgi Meisam sharifzadeh Ekbatani Amene Navaeian Mahmoud Khodabandeh Shima Mahmoudi Setareh Mamishi Pediatrics Center of Excellence Children's Medical CenterTehran University of Medical SciencesTehranIran Pediatric Infectious Disease Research Center Tehran University of Medical ScienceTehranIran Division of Pediatric Intensive Care Unit Pediatrics Center of ExcellenceChildren's Medical CenterTehran University of Medical SciencesTehranIran Department of Infectious Diseases Pediatrics Center of ExcellenceChildren's Medical CenterTehran University of Medical SciencesTehranIran

Background Coronavirus disease 2019(COVID-19)is the current pandemic disease without any vaccine or efficient treat-ment to rescue the *** diseases predispose the patients to a more severe disease and to a higher mortality ***,little evidence exists about COVID-19 outcomes in the pediatric population with congenital heart disease(CHD).Here,we report nine children with COVID-19 and concomitant *** Our study included nine children with COVID-19 and concomitant CHD who were admitted to Children Medical Center Hospital during March and April *** patients were classified based on the final outcome(death),and their clinical sign and symptoms,type of CHD,and drugs administered were *** Among the nine patients,two died and we compared different characteristics,laboratory results and clinical findings of these cases based on the *** deceased patients had severe types of CHD,worse arterial blood gases,severe clinical symptoms,higher mean level of partial thromboplastin time and C-reactive protein,and required more *** The present study showed that the general consideration of mild COVID-19 in children does not include patients with CHD and that it is necessary to pay greater attention to children with CHD to determine guidelines for treatment of COVID-19 in these *** to the scarcity of CHD and COVID-19,we reported only nine ***,further studies are highly required in this regard.

关键词： Congenital heart disease Coronavirus disease 2019 Pediatrics

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