Transition to and from Turbulence in a Vertical Heated Pipe - Elena Marensi скачать в хорошем качестве

Transition to and from Turbulence in a Vertical Heated Pipe - Elena Marensi

LIFD Symposium | Elena Marensi | 12th June 2025 Abstract: The transition from laminar to turbulent flow in a pipe remains one of the oldest outstanding problems in fluid mechanics. In a vertically-aligned pipe, under the influence of heating, the opposite process has been observed, i.e. turbulence may be partially or fully suppressed by buoyancy forces. As the suppression of turbulence leads to severe heat transfer deterioration, this phenomenon is undesirable in both heating and cooling applications, such as nuclear reactor cooling systems and geothermal energy capture.  In this talk, I will present our recent advances in understanding, predicting and optimising the phenomenon of relaminarisation due to buoyancy forces through the mathematical framework of dynamical systems theory and the use of modern stability-analysis tools. Connections to turbulence control strategies in ‘ordinary’ (isothermal) pipe flow will also be discussed, where, instead, turbulence suppression is typically highly desirable, as it leads to drag reduction and lower energy consumption. Bio: Dr Elena Marensi lecturer of Fluid Mechanics in the Department of Mechanical Engineering at the University of Sheffield. Her research focuses on transition to turbulence in wall-bounded shear flows, flow instabilities, turbulence modelling and control, and flow optimisation. To tackle these problems she combines mathematical tools with high-fidelity computer simulations and data-driven approaches applied to both numerical and experimental data. For more information on LIFD, please visit our website: https://fluids.leeds.ac.uk/ Sign up to the LIFD mailing list: https://leeds.onlinesurveys.ac.uk/lif...