March 11-12, 2023, Virtual Conference
L. Zubair, M. BelalTahia, S. Islamand A. S. Mollah, Department of Nuclear Science and Engineering, Military Institute of Science and Technology(MIST), Dhaka, Bangladesh
The heat generated in spent nuclear fuel by fission products is dissipated in the spent nuclear fuel storage pools, elevating the water temperatures. Pools with adequate heat exchanger capacity maintain temperatures below 40°C as per safety limit. Reactor pool specifications generally call for fuel pool temperatures of 40°C with full heat exchange capacity. The spent fuel pool cooling system, which is intended to remove leftover residual heat produced by used fuel stored in the spent fuel pool, typically ensures cooling of the spent fuel pool.Pumps move water through heat exchangers and back to the spent fuel storage pool from the spent fuel pool.This study aims to develop a laboratory-scale spent fuel wet storage system using Helical Coil Heat Exchanger (HCHE) for better heat transfer performance compared to conventional heat exchangers and to explore an alternative cooling device suitable for this heat transfer. In regards to traditional heat exchangers, helical coils occupy less volume and provide more surface area for effective heat transfer. In this study, a laboratory-scale spent fuel storage system has been designed and fabricated using locally available materials in order to remove the heat produced from spent fuels. The heat removal capacity of a locally developed spent fuel system with a helical coil heat exchanger has been evaluated and discussed in the present work. The experimental values on heat transfer coefficient are reasonably good agreement with those of numerical forecasts. An uncertainty analysis revealed that the results' accuracy is within ~6%.
Spent fuel pool (SFP), Decay heat, Helical coil, Heat exchanger, Heat transfer coefficient.
Marco AVILA LOPEZ, Leïla AKLOUCHE and Victor Hugo CANTU MEDRANO, Technology & Engineering Center Toulouse, France, 4 avenue Didier Daurat, 31700 Blagnac
Modeling of the polarization curve and phenomena of a Nafion® 112 membrane in the MEA was done. The results show an average difference of 5.7% compared to the experimental data in the literature. The model allowed to study the influence of the operating pressure at different flight altitudes on the power and current of the cell, as well as the evolution of the main properties in the membrane. The developed models will be the necessary basis for the simulation of other components of the fuel cell.
PEMFC, modeling, hydrogen, membrane system, polarization curve.
Solechan1,3, Agus Suprihanto1, Susilo Adi Widyanto1, Joko Triyono2, Abdul Rohman Sani3, 1Department of Mechanical Engineering, Faculty of Engineering, Diponegoro ,University, Semarang, Indonesia, 2Department of Mechanical Engineering, Sebelas Maret University, Surakarta, Indonesia, 3Department of Mechanical Engineering, Universitas Muhammadiyah Semarang, Semarang, Indonesia
Most patients with fracture injuries due to accidents are the femur. Internal fixation of plates and screws as a medium for healing femoral fractures. Internal fixation of plates from PLA/PCL biodegradable polymers is the most widely used to replace metals. Biodegradable polymers have many weaknesses in terms of mechanical strength which is still low and the rate of degradation is difficult to control. The addition of nHA reinforcement to form composite materials with the cold isostatic pressing method at high compaction pressure can increase mechanical strength. PLA/PCL/nHA composite materials were made into specimens for characters that can reduce the porosity’s size and increase mechanical strength. High compaction pressure has no significant effect on material properties. The proof is that the FTIR test of the three specimens still has band peaks which are identified as elements of the PLA/PCL/nHA composite material. The XRD test results prove the same, which show a widened diffraction peak. This means that there are no crystal peaks in the composite material, this proves that the structure is amorphous, the level of crystallinity is low and the degradation time is faster. The most optimal compressive and tensile strength test results at a compacting pressure of 40 MPa with a compressive strength value of 71.2 N and a tensile strength of 23.36 N/mm2 . This compaction pressure can reduce the porosity’s size, the surface is smoother, the interfacial bonds are stronger, the density is high and the mechanical strength increases larger. However, the compressive and tensile strength is still below the strength of the femur bone at the implant site.Composite, Femur, Plate, Isostatic, Polylactic Acid, Hydroxyapatite
Composite, Femur, Plate, Isostatic, Polylactic Acid, Hydroxyapatite.
Botir Usmonov, Tashkent chemical-technological institute u, Uzbekistan, 100032 Tashkent, A. Navoi-32
In the present work, the vibratory behavior of an airfoil is discussed. The airfoil is considered as two-degree-of-freedom structure with hereditary deformable suspensions. The weak singular integro-differential equation is numerically solved using numerical integration method. Finally, numerical results for the creep response and resonance behavior of the viscoelastic materials were analyzed. These results are obtained for the perfect elastic and viscoelastic suspensions with the nonlinearity feature. As demonstrated in the airfoil model, the equation of motion with hereditary and nonlinear terms successfully illustrate realistic vibratory characteristics of two-dimensional viscoelastic problems.
Vibration analysis, hereditary deformable, integro-differential equation, viscoelastic
This article discusses the crash analysis of automobiles and the importance of ensuring the safety of occupants during the engineering design phase. The process involves multiple numerical analyses to virtually approve the physical mock-up before testing in real crash conditions. The crash phenomena are divided into three stages, and material models are created for both bones and organs to accurately model their response. Bone response is relatively easy to model but still requires laboratory testing, while organ material models are complex due to high nonlinearity. Experiments are conducted on small organ parts, and finite element models are created to validate the material models. Joint and ligament behavior must be accounted for, and spine posture prediction is also considered. The Full Human Body Model and its material models are much more complex than shown, and many other analyses are performed. Overall, this article provides insight into the complex and critical process that may affect the convergence of the analysis, in this sense, understanding the material behaviour properly helps the engineering designer to perform safety analysis of occupants in automobiles properly.
Brittle material models, Soft material models, Crashworthiness, Human body model