scispace - formally typeset
Search or ask a question
Author

Sateesh Gedupudi

Other affiliations: Brunel University London
Bio: Sateesh Gedupudi is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Heat transfer coefficient & Heat transfer. The author has an hindex of 10, co-authored 50 publications receiving 412 citations. Previous affiliations of Sateesh Gedupudi include Brunel University London.

Papers published on a yearly basis

Papers
More filters
Journal ArticleDOI
TL;DR: The present paper conclusively explains several physical phenomena observed, yet hitherto unexplained, in the case of the surface tension of such complex fluids by segregating the individual contributions of each component of the colloidal system.
Abstract: A systematically designed study has been conducted to understand and demarcate the degree of contribution by the constituting elements to the surface tension of nanocolloids. The effects of elements such as surfactants, particles and the combined effects of these on the surface tension of these complex fluids are studied employing the pendant drop shape analysis method by fitting the Young-Laplace equation. Only the particle has shown an increase in the surface tension with particle concentration in a polar medium like DI water, whereas only a marginal effect of particles on surface tension in weakly polar mediums like glycerol and ethylene glycol has been demonstrated. Such behaviour has been attributed to the enhanced desorption of particles to the interface and a theory has been presented to quantify this. The combined particle and surfactant effect on the surface tension of a complex nanofluid system showed a decreasing behaviour with respect to the particle and surfactant concentration with a considerably feeble effect of particle concentration. This combined colloidal system recorded a surface tension value below the surface tension of an aqueous surfactant system at the same concentration, which is a counterintuitive observation as only the particle results in an increase in the surface tension and only the surfactant results in a decrease in the surface tension. The possible physical mechanism behind such an anomaly happening at the complex fluid air interface has been explained. Detailed analyses based on thermodynamic, mechanical and chemical equilibrium of the constituents and their adsorption-desorption characteristics as extracted from the Gibbs adsorption analysis have been provided. The present paper conclusively explains several physical phenomena observed, yet hitherto unexplained, in the case of the surface tension of such complex fluids by segregating the individual contributions of each component of the colloidal system.

87 citations

Journal ArticleDOI
TL;DR: In this article, a 3D numerical simulation of bubble growth from nucleation to full confinement was performed using the volume of fluid (VOF) method in commercial CFD code FLUENT.

67 citations

Journal ArticleDOI
TL;DR: In this article, a simple 1-D model for bubble growth in a single channel with a compressible volume in its upstream plenum is developed as a tool for the rational design of measures known to reduce flow instabilities, namely inlet resistance and enhanced nucleation in every channel.

55 citations

Journal ArticleDOI
TL;DR: In this paper, a transient plane source technique was used to measure the thermal transport properties of rice straw bale sample. And the results showed that the effective thermal conductivity values obtained in the case of perpendicular/random orientation are approximately 1.7 times lower compared to parallel case.

36 citations

Journal ArticleDOI
TL;DR: In this article, the combined effect of surfactants and nanoparticles on the wettability of complex fluids such as nanocolloids on different substrates, ranging from hydrophilic with a predominantly polar surface energy component (silicon wafer and glass) to near hydrophobic range with a predominant dispersive component of surface energy (aluminum and copper substrates).
Abstract: Even though there are quite large studies on wettability of aqueous surfactants and a few studies on effects of nanoparticles on wettability of colloids, to the best of authors’ knowledge, there is no study reported on the combined effect of surfactant and nanoparticles in altering the wettability. The present study, for the first time, reports an extensive experimental and theoretical study on the combined effect of surfactants and nanoparticles on the wettability of complex fluids such as nanocolloids on different substrates, ranging from hydrophilic with a predominantly polar surface energy component (silicon wafer and glass) to near hydrophobic range with a predominantly dispersive component of surface energy (aluminum and copper substrates). Systematically planned experiments are carried out to segregate the contributing effects of surfactants, particles, and combined particle and surfactants in modulating the wettability. The mechanisms and the governing parameters behind the interactions of nanocol...

36 citations


Cited by
More filters
Journal ArticleDOI
TL;DR: In this paper, a discussion of the possible applications of flow boiling in microchannels in order to highlight the challenges in the thermal management for each application is presented. But, several fundamental issues are still not understood and this hinders the transition from laboratory research to commercial applications.

325 citations

Journal ArticleDOI
TL;DR: In this article, a large pool of published papers on computational simulation of boiling and condensation is reviewed and compared, as well as identification of future research needs to improve predictive computational capabilities.

297 citations

Journal ArticleDOI
TL;DR: In this article, the mass transfer process, the formation and evolution of phase fronts and the identification of mechanisms of pattern formation are discussed, and several potential directions for future research in this area are discussed.

227 citations

Journal ArticleDOI
01 Apr 2019-Fuel
TL;DR: In this paper, the authors reviewed the effects of NPs in low salinity water (LSW) and surfactant on the IFT of sandstone and carbonate reservoirs.

200 citations

Journal ArticleDOI
TL;DR: In this article, numerical simulations of single elongated bubbles in flow boiling conditions within circular microchannels were performed, where thin-film evaporation was proved to be the dominant heat transfer mechanism in the liquid film region between the wall and the elongated bubble.

166 citations