Day 1 :
Keynote Forum
Leonard L Vasiliev
National Academy of Sciences of Belarus, Belarus
Keynote: Heat pipes with nanocomposites analysis and application
Time : 09:30-10:10
Biography:
Leonard L Vasiliev is the President of the NIS Association “Heat Pipes”, Chief Researcher of the Luikov Heat and Mass Transfer Institute, National Academy of Sciences, Belarus. He started his scientific career with studies of thermal properties (thermal conductivity, heat capacity, thermal diffusivity) of solid materials at cryogenic temperatures and developed a new non-stationary method of its measurements (1960-1964) in the Luikov Heat and Mass Transfer Institute under the guidance of Professor Alexis Luikov as his Supervisor. He obtained the first Doctor’s degree (Candidate of science) in 1964 in Minsk with the thesis “Thermal properties of solid materials at cryogenic temperatures”.
Abstract:
Solar energy is one of the most interesting solutions among renewable energy resources as it can be converted easily whether into heat, cold, or into electricity. The main problem when using such an energy source is its unfair time distribution which may cause mismatch between needs and availability. Heat pipes, long thermosyphons (vapor dynamic thermosyphons, and flat polymeric loop thermosyphons) are of great interest as components of heat exchangers for recuperation of energy of renewable sources (solar, ground) and upgrading their potential with the help of heat pumps. Transparent heat pipes and thermosyphons with nanofluids and nano-coated surface inside considered in this research program are a good tool to absorb solar radiation in the volume of the fluid flow. Vapor dynamic thermosyphons cooling system is good solution for building-integrated photovoltaic technology. Development of the new environmentally – friendly and energy – efficient technologies will be vital to achieving investigation of a hybrid photovoltaics/thermo-collector (PV/T) systems, providing electricity and heat/cold simultaneously, represent an important step toward reducing dependency on fossil fuels.
Keynote Forum
Wing F Ng
Virginia Tech, USA
Keynote: Gas turbine flow characterization using non-intrusive acoustic measurements
Time : 10:10-10:50
Biography:
Wing F Ng has completed PhD from MIT Gas Turbine Lab and holds the Chris Kraft Endowed Professorship of Mechanical Engineering at Virginia Tech. Throughout his career, he has won many awards for his teaching, research and entrepreneurial activities. He has 35 years of research experience in gas turbine aerodynamics & heat transfer, has received 5 ASME best paper awards, and is an active advisor for NASA and the US Air Force. In addition to his full-time faculty role, he owns an engineering and manufacturing company by the name of Techsburg, Inc.
Abstract:
Traditionally, intrusive instruments such as total pressure and total temperature probes have been used to measure compressible flow conditions. While these instruments are effective and widely used, they generate turbulence and produce blockage which could be undesirable in a variety of applications. Throughout this research, the use of non-intrusive acoustic measurements for flow velocity and temperature detection in compressible flow (Mach>0.3) environments was investigated. First, a novel acoustic technique was developed for compressible flow applications. The new approach was used to accurately measure single-stream jet velocities and temperatures in compressible flow conditions for the first time. Later research explored the use of this technique at the exhaust of a JT15D-1A turbofan research engine. Ultimately, 1.1 kg/s and 200 N root mean square errors in mass flow and thrust were observed for the tested engine conditions. Overall, the results of this experiment demonstrated that acoustic measurements could be used to estimate engine mass flow rate and thrust in a non-intrusive manner. The final portion of this research focuses on the non-intrusive detection of fluid velocity and temperature gradients. Since existing acoustic tomography techniques require an incompressible flow assumption, a novel approach has been proposed and used to perform a validation experiment in the single-stream jet facility. The recent experimental findings indicate that non-intrusive acoustic measurements could be used to measure velocity and temperature gradients in compressible flow environments as well. Further research is currently being conducted to better understand the accuracy limitations of the proposed tomography technique. To the authors’ knowledge, this is the first time a non-intrusive acoustic technique has been used to characterize engine flows with Mach numbers greater than 0.3.
Keynote Forum
I V Sharikov
Saint Petersburg Mining University, Russia
Keynote: The scaling problem of oxide materials hydrothermal synthesis for various autoclave reactors with considering natural convection
Time : 11:20-12:00
Biography:
I V Sharikov graduated from the Technological University, St.-Petersburg, in 1958. Diploma qualification is “chemical engineer-technologist”. In 1961 he entered a post-graduate course in the same Technological University, department of Physical Chemistry. In 1965 he presented a dissertation work and got Ph.D (physical chemistry), chemical kinetics and mass transfer phenomena. From 1965 to 1979 he was Head of Laboratory of mathematical modelling and optimisation of chemical and technological processes (Research Institute of Synthetic Resins, Vladimir, VNIISS). In 1973 he presented and defended a dissertation work for Doct. Sci. – “Mathematical modelling of cellulose esters production process”. In 1976 he got a Professor diploma for the speciality “Processes and Apparatuses in Chemical Technology”. In 1979 he became Head of the Department for engineering judgement of chemical processes (Russian Scientific Centre “Applied Chemistry”, RSC AC, or GIPH). 1985-1999 - Deputy General Director for scientific work in RSC AC. 1999-2007 - Principal Research Scientist, leader of several works on developing new chemical processes and their engineering aspects. Totally 182 articles were published in Russian and foreign scientific journals. I.V. Sharikov is a member of the working group on Loss Prevention in industry in the European Society of Chemical Engineers. From 2004 and up to the moment I.V. Sharikov is professor of Saint Petersburg Mining University, Department of Technological Processes Automation. His area of interest is mainly the problem of optimal control and modeling for high temperature metallurgical and petrochemical processes. He is fluent in English and German.
Abstract:
Hydrothermal synthesis is widely used for the production of various nanodispersed oxide materials. Reactions under hydrothermal conditions are complicated and usually they are accompanied with heat generation or heat absorption. Heat flux calorimetry is a powerful instrument for kinetic study and developing mathematical models of hydrothermal reactions. A mathematical model makes it possible to determine optimal experimental conditions for the production of a definite material on the base of a limited number of kinetic calorimetric runs. But in order to apply the kinetic data to reactors of larger volume one should take into account heat transfer, mass transfer phenomena and non-uniform temperature distribution in a definite apparatus at the chosen initial conditions and in course of hydrothermal synthesis. Reaction vessel of C80 Calvet calorimeter (SETARAM Instrumentation) is a micro-autoclave of 8.5 cm3 volume without mechanical stirring. Heat transfer and mass transfer inside it are run due to natural convection while heating to a chosen temperature of an isothermal run. And temperature gradient in this case is rather moderate (yet not negligible) as the reactor is relatively small. If we pass to the reactor of a larger volume (e.g., 1 liter) – we find that the real temperature mode in it is far from that in a kinetic vessel at the same initial conditions. In order to take into account the temperature and conversion distribution due to natural convection in course of a definite hydrothermal synthesis we have developed a mathematical model that takes into account convection inside a hydrothermal reactor together with the chemical reaction. Convective flows were described at the base of Business approach and the differential equations system was solved with applying Convex program package that takes into account size and geometry of the reactor, reaction mixture properties, heat transfer peculiarities inside and outside and heat generation due to chemical reaction. It was found that temperature and conversion distributions in the calorimetric vessel and in the 1 liter reactor were rather different at similar initial conditions from the very beginning. Time of reaching the stationary temperature profile in the bigger vessel at implementing, e.g., isothermal mode is comparable with total duration of the run, and stationary temperature gradient is bigger as well. This indicates of the necessity to estimate rigorously the natural convection and heat transfer phenomena at scaling the hydrothermal synthesis for the reactor of bigger volume without mixing. Kinetic models developed on the base of calorimetric data cannot be directly applied to simulating the hydrothermal synthesis process in such a reactor.
- Fluid Dynamics | Turbine | Heat Transfer System | CFD Methodology | Hydrodynamics | Aero-acoustics | Aerodynamics Simulation
Location: Sylt 3
Chair
Leonard L Vasiliev
National Academy of Sciences of Belarus
Co-Chair
I V Sharikov
Saint Petersburg Mining University, Russia