Online Seminar on Predictive tools and novel experiments for cavitating flows by Prof. Manolis Gavaises

Abstract

Cavitation is realised in many engineering applications as well as in ultrasound systems. Cavitation occurs when pressure falls suddenly below the fluid’s vapour (saturation) pressure. Depending on the pressure recovery process of the fluid towards pressures above the cavitation threshold, sudden vapour collapse during the condensation of the liquid results to radiated noise and catastrophic damage to nearby materials. Examples include hydraulic systems, fuel injectors and rotating fluid machinery (propellers, turbines, pumps) and even traumatic brain injury. On the other hand, ultrasound-induced cavitation is utilised in many applications such as ultrasound imaging, lithotripsy, histotripsy, drug delivery, cleaning and even microbial deactivation.

Multidimensional models developed to simulate cavitation over a variety of cases are presented. The present work is the first that couples the compressible Navier-Stokes and energy conservation equations with a thermodynamic closure approximation covering pressures from 0 to 4500bar and temperatures up to 3000K; these conditions expand from compressed liquid, vapor-liquid equilibrium to trans/supercritical mixing. The model assumes mechanical and thermal equilibrium between the liquid, vapour and air phases and thus, it avoids utilisation of case-dependent empirical phase-change models, typically employed for predicting such cases. An overview of validation against experiments performed in dedicated test rigs employing mCT as well as high energy X-rays are presented. 

Short Bio

Manolis Gavaises (MG) is Professor of Fluid Dynamics at City, University of London since 2009. He received his PhD from Imperial College London in 1997 (the 1998 Richard Way Prize for 'Most outstanding doctoral thesis in the area of IC engines in the UK'; the Arch T. Collwell Merit Award from the Society of Automotive Engineers (SAE)). MG started his academic career at City, University London in 2001. Between 2009-2012 he was holding the Delphi Diesel Systems (UK) Chair in Fuel Injection Equipment Fluid Dynamics. In 2012 he co-established and directs the International Institute for Cavitation Research (IICR); IICR now represents a wide network of Universities and industries looking into various aspects of cavitation and multiphase flows.

https://orcid.org/0000-0003-0874-8534

https://scholar.google.com/citations?user=RnDOy8MAAAAJ

Notice: This event is open to public in respect with the VKI eligibility criteria.