Abstract
Nanofluids stability on rest is important to characterize the nanofluids thermophysical properties before being used on different thermal systems. However, this stability can be modified during devices operation because of different thermal loads, fluid movements and phase changes. Particularly, in Two Phase Closed-Thermosyphon (TPCT). Input response are heat input, flow rate and inclination angle. Graphene and fe304 nanofluids used as working fluid in the fill ratio of 50%. An attempt is made to optimise the process parameters with Response Surface Methodology (RSM) using Box - Behnken design for 6063 aluminium alloy (AA) semi-circular two phase closed thermosyphon (TPCT). Experiments are conducted by varying the mass flow rates of water at condenser section and by varying the heat input at evaporator section and varying inclination angle. The effects of variables on the process parameters are studied. The study, predominantly, aims at assessing how the variables affect the process parameters.
Highlights
Carbon nanomaterials, such as carbon nanotubes (CNTs) or graphene, which combine lightness and high thermal conductivity are widely recognized as excellent candidates for the new generation of nanofluids [1]
On account of the heat flux increase, caused by the increase of temperature gradient occurring between evaporator and condenser, there is an increase in the thermal efficiency of heat pipe(Amit Faghri 2016).The heat input shows higher values as more heat is generated in the surface and the working fluid, found in state of vapour, enters rapidly into the condenser section
It is aimed to investigate the performance of semi circular Two Phase Closed-Thermosyphon (TPCT) with Fe3O4 and graphene nano-fluids
Summary
Development of new technologies is hampered by heat management, exchange and evacuation for numerous fields of application. Nanofluids are a relatively recent class of fluids that have the potential to drastically increase heat exchange in energy systems compared to conventional fluids This is achieved through the dispersion of nano-sized particles with enhanced thermal properties and stably suspended in a liquid medium. The device has three parts, namely the evaporator, adiabatic and condenser; the adiabatic is found between evaporator and condenser; and the evaporator found below the condenser, allows the flow of condensate using the action of gravity This is the chief mechanism employed in the functioning of thermosyphon. The literature review highlights the point that the types of cross-section, working fluid and the power input determine the TPCT functioning ability This happens because the TPCT has a complex structure of boiling process which impacts on the thermal resistance and the overall performance of the TPCT.
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