1 Department of Mechanical Engineering, Saveetha Engineering College, Chennai 602105, Tamil Nadu, India

2 Department of Mechanical Engineering, University College of Engineering, Dindigul 624622, Tamil Nadu, India


Much research works are being carried out in applications of nanofluids at different engineering fields as they have
improved thermal conductivity. However, the effective applications of nanofluids have limitations such as poor stability,
sedimentation, erosive wear and potential health risk. In heat transfer application point of view, stability of nanoparticles
plays a major functionin enhancing heat transfer. In this experimental investigation, the stability of Multi-walled
Carbon Nano Tube (MWCNT)/water nanofluids with surfactant and without surfactant has been carried out by keeping
the nanofluids at static condition and at constant temperature at different time interval. The nanofluids were prepared by
means of the use of Multi-walled Carbon Nano Tube (MWCNT) as base materials and distilled water as base fluids at
0.1%, 0.3%, 0.5% and 0.7% volume concentration with 0.02% and 0.05% sodium dodecyl butane sulfonate (SDBS) as
surfactant and without the surfactant two-step method is used to put together the nanofluids underneathattention.
The stability analysis ofpreparednanofluids are studied with the UV-Vis. spectrophotometer, measure of zeta potential
value , and photograph capturing techniques by keeping the nanofluids under static condition for The MWCNT
nanofluids have been characterized with the sample ofjust after preparation after 30days of preparation and after 60
days.It is studied that the nanofluids with surfactant showed better stability than the nanofluids without surfactant.
Found that the nanofluids at 0.7% volume concentration with surfactant showed good stability with negligible visual
sedimentation even after 60 days than the nanofluids without surfactant. Therefore the MWCNT/water nanofluids are the
potential heat transfer fluids to apply in heat transfer field.Copyright © VBRI Press.


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