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Articles by K.S. Suganthi
Total Records ( 4 ) for K.S. Suganthi
  K.S. Suganthi and K.S. Rajan
  Nanofluids are solid-liquid dispersions containing nanoparticles of size 1-100 nm in a liquid. Nanofluids that have enhanced thermal conductivity are best known for their application as coolants in food storage, transportation, refrigeration and air-conditioning industries. Considerable energy savings can be realized through the use of nanofluids as coolants. Viscosity is one of the major transport properties that determine the heat removal capability of nanofluids. The present study reports the effect of calcination temperature on the primary particle size, aggregate size of the ZnO nanoparticles and on the transport properties of the ZnO-water nanofluid. ZnO nanoparticles have been synthesized using Zinc nitrate hexahydrate as precursor. The primary particle size of the ZnO nanoparticles calcined at different temperatures ranging from 100-500°C was found to be in the range of 40-60 nm. The effect of calcination temperature on hydrodynamic size distribution of the ZnO nanoparticles has been investigated using dynamic light scattering technique. The viscosity of ZnO-water nanofluids, using ZnO powders prepared at different calcination temperatures have also been studied, along with their colloidal stability.
  S. Manikandan , N. Karthikeyan , K.S. Suganthi and K.S. Rajan
  Experiments were carried out with Fe2O3-water nanofluids to study possible enhancement in volumetric mass transfer coefficient for transfer of oxygen from air bubble to nanofluid, in an agitated, aerated bioreactor. The nanoparticles concentration was varied in the range of 0.022 to 0.065 wt.%, while the reactor was operated at three operating conditions viz. 200 rpm and 1.5 L min-1 of air flow, 100 rpm and 1.5 L min-1 of air flow and 200 rpm and 0.75 L min-1 of air flow. Nanoparticles were found to contribute to enhance oxygen transfer through ‘grazing effect’. An enhancement of 63% was observed for 0.065 wt.% Fe2O3-water operated at 200 rpm and 0.75 L min-1 air flow.
  V. Gayadhthri , K.S. Suganthi , S. Manikandan and K.S. Rajan
  Rod-shaped iron oxide nanoparticles were prepared by chemical co-precipitation route using ferric chloridehexahydrate (FeCl3•6H2O) and ferrous chloridetetrahydrate (FeCl2•4H2O) as precursors. Iron oxide nanofluids were prepared by dispersing rod shaped α-Fe2O3 nanoparticles in water. Experiments were carried out to study the influence of surfactants on the colloidal stability, particle size distribution of nanofluids. Nanofluid with Sodium Do-decyl Benzene Sulfonate (SDBS) as surfactant showed increase in thermal conductivity of about 14% when dispersed in water.
  Anju K. Radhakrishnan , V. Aishwarya , K.S. Suganthi and K.S. Rajan
  Experimental studies on heat transfer in a jacketed vessel were carried out to test the performance of two nanofluid coolants, viz. Mn0.47Fe2.53O4-propylene glycol (2 vol%) and CuO-propylene glycol (1 vol%) nanofluids, against pure propylene glycol. The flow rate of process fluid (Therminol-55®) flowing through the jacket was varied between 60-500 mL min-1. In general, these nanofluids were able to reduce the outlet temperature of process fluid to values lower than that achieved using pure propylene glycol. These nanofluids are more effective at higher flow rates of process fluid due to their improved transport properties.
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