Thermofluidic analysis of hydrogen storage tanks

Hydrogen is one of the promising vectors toward a sustainable future. Among the different steps of its implementation, storage plays a key role. This master thesis intends to investigate the thermal and fluidic aspects of this storage technology and to develop a thermodynamic model to assess the response of the tank under different conditions and configurations. To achieve this, a 0-degree model is created in MATLAB with the goal of simulating liquid hy- drogen (LH2) storage conditions. The model uses principles of fluid dynamics, thermodynam- ics, and heat transfer, allowing the simulation of hydrogen behaviour under different storage conditions. In addition, this model should be able to accurately evaluate a variety of data, such as the pressure and temperature values for the different phases and the thermophysical prop- erties. For the latter, this code uses the open-source CoolProp library [7], which has allowed for reliable and flexible extraction of thermophysical data for the fluid in question, hydrogen, or the different isomers observed under cryogenic storage conditions, such as parahydrogen. This model should also be able to simulate different scenarios that a liquid hydrogen storage tank may be subjected to, such as self-pressurisation and isobaric storage with pressure relief. The model and Matlab code are validated against a variety of data extracted from other papers, both experimental and numerical, for the specific storage stages. Then the model is used to create a parametric study for storage conditions. In addition, this thesis does a detailed review of the available literature, aims to examine the state-of-the-art, and investigates in detail different papers and reputable researchers that are also operating in this field. Some additional studies are taking place examining heat transfer correlations and transport phenomena taking place in the storage, as well as the thermal properties of the solid materials that create the storage tank arrangemen

Use of isolated Roux loop for pancreaticojejunostomy reconstruction after pancreaticoduodenectomy

AIM: To evaluate the efficacy of the isolated Roux loop technique in decreasing the frequency of pancreaticojejunal anastomosis failure

Effect of anakinra on mortality in patients with COVID-19: a systematic review and patient-level meta-analysis

International audienc