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Author: search.filters.author.Ramesh, G.Subject: search.filters.subject.Contact resistance

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    Wetting kinematics and spreading behaviour of water based aluminium nanofluids during immersion quenching
    (2013) Ramesh, G.; Prabhu, K.
    In the present work, wetting kinematics of water based aluminium nanofluids having nanoparticle concentrations varying from 0.001 to 0.5 vol.-% during immersion quenching of Inconel 600 probe was investigated by measuring the contact resistance. The contact resistance between the quench probe and counter electrode during quenching indicated that the duration of the film of water vapour decreased with increasing nanoparticle concentration as well as absence of stable vapour film formation with 0.05, 0.1 and 0.5 vol.-% of nanoparticles. The phenomenon of a repeated wetting process was observed during quenching in nanofluids. Further, quenching in 0.1 and 0.5 vol.-% nanofluids indicated the formation of a nanoparticle porous layer and its deposition on the quench probe. The spreading behaviour was studied by measuring the dynamic contact angle of nanofluids droplets on Inconel 600 substrate. Contact angle measurement showed that the addition of aluminium nanoparticles did not have a significant effect on the relaxation of contact angle of water droplet. However, lower static contact angles were obtained for nanofluids indicating improved wetting. © 2013 IHTSE Partnership.
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    The effect of addition of copper nanoparticles on wetting behaviour of water during immersion quenching
    (2013) Ramesh, G.; Prabhu, K.
    In the present work, the effect of addition of copper nanoparticles to water, in concentrations varying from 0.001-0.1 vol%, on wetting behaviour during immersion quenching of Inconel 600 probe was assessed using near surface temperature probe and contact resistance methods. Quenching in nanofluids resulted in decreased duration of vapour blanket stage and rapid wetting. The wetting front velocity increases with increase in nanoparticle concentration. A stable vapour film was not formed during quenching in nanofluids of 0.05 and 0.1 vol%. Quenching in 0.01, 0.05 and 0.1 vol% nanofluids showed characteristics of repeated wetting process. Quenching in 0.1 vol% nanofluid resulted in the formation of porous layer of nanoparticles. © 2013 Indian Institute of Metals.