Thesis supervisor: Ferenc Lezsovits
Location of studies (in Hungarian): Department of Energy Engineering Abbreviation of location of studies: EGR
Description of the research topic:
a.) Antecedents: Nanofluids are suspensions that can be obtained by dispersing different nanoparticles in host fluids with the aim of enhanced thermal properties. Many of the industries using conventional fluids such as water, engine oil, De-ionized water (DI), Ethylene Glycol (EG), Transformer oil etc are generally used as heat transfer fluids. The duration period and life time of the equipment is based upon the performance and efficiency of the heat transfer fluids. The low heat transfer performance of these conventional fluids reduces the performance and enhancement due to this the size of the heat exchanger may be increases and the experiments proved that the conventional fluids have low thermal conductivity compared to solid parts, so in substitute of the conventional fluids. Solid particles with high thermal conductivity are generally added as an additive to the conventional fluids to increase their thermal conductivity. It is obvious that solid particles having thermal conductivities several hundred times higher than these conventional fluids to improve thermal conductivity of a fluid, suspension of ultrafine solid particles in the fluid can be a creative idea..
b.) Aim of research: The aim of this research is to study experimentally and numerically the forced convective heat transfer behavior of (Graphene oxide, Al2O3, TiO2, Ag and SiC ) nanofluids inside boiler tubes subject to radiant and convective heat flux at the pipe wall. Nanoparticles dispersed in pure boiler water are used as the working fluid. Consideration is given to the effect of the inclusion of nanoparticles on heat transfer enhancement, thermal conductivity, viscosity, and pressure loss in the turbulent flow.
c.) Tasks: In this research an experimental and computational study of forced convective heat transfer for heat exchange in boiler system with nanofluids will be conduct. The test rig is setup to measure temperatures and pressure drop between inlet and outlet of the system Furthermore, CFD model will be simulate by finite volume method and using FLUENT program to solve governing equations. The comparison among experimental and simulation results will be carry then will valid with other researchers data.
d.) Required equipment:Computer, availability of FLUENT- ANSYS access to the scientific literature, and all the necessary laboratory equipment are readily available at the department.
e.) Expected scientific results: The study is expected to offer insightful enhancement of heat transfer by using nanofluids in boilers to develop the design and optimization process of heat exchange system and their applications..
f.) References:
Lezsovits F., Könczöl S.: Operational experience and problems at converted boilers from steam to warm water system, Proceedings of 11th HEEP Balatonfüred, Hungary, 03/06/2013-05/06/2013, pp. 59-66. ISBN: 978-963-313-091-9
Lezsovits F., Könczöl S., Sztankó K.: CO emission reduction of a HRSG duct burner THERMAL SCIENCE 14:(3) pp. 845-854. (2010)
Könczöl S., Lezsovits F.: Investigation results of heat transfer and fluid flow in hot water boilers installed in district heat centers, Proceedings of 10th HEEP, Balatonfüred, Hungary, 28/05/2001-30/05/2001, pp. 151-156.
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