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
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TL;DR: In this paper, in situ data extraction from a straw envelope and the subsequent thermal characterization of straw, a test room of 10 cm thick raw rice straw envelope was designed and built The effective thermal and moisture diffusivities of the straw envelope based on the collected temperature and relative humidity data were evaluated four commonly used models were selected to predict the outside heat transfer coefficient for the rough surface of the envelope.
Abstract: The after-effects of human-induced climate change pose complex engineering challenges to the building sector One of the ways of reducing the carbon footprint of buildings is the use of bio-based construction materials with capacity to passively manage the hygrothermal performance of buildings Research during the recent years has led to the emergence of straw as a potential candidate In the present study, with the aim of in situ data extraction from a straw envelope and the subsequent thermal characterization of straw, a test room of 10 cm thick raw rice straw envelope was designed and built The effective thermal and moisture diffusivities of the straw envelope based on the collected temperature and relative humidity data were evaluated Four commonly used models were selected to predict the outside heat transfer coefficient for the rough surface of the straw envelope A comparison between the surface temperatures from the experiment and the 1-D transient numerical studies employing the model-derived outside heat transfer coefficients and sol-air temperatures pointed to the DOE-2 model being the best suited with 92% of the predicted surface temperatures within ± 15% of the experiment values A similar comparison study was employed to verify the ranges of inside heat transfer coefficient The study provides a framework for the determination of the thermal transmittance of straw based walls and helps in the optimum thermal design of a straw envelope
8 citations
TL;DR: In this article, a systematic review of the performance of the prior correlations and their applicability for different conditions based on a large experimental database compiled from 12 sources containing 1365 data points in total, focussing on water as the working fluid.
8 citations
TL;DR: In this article, the effect of inlet resistance on maximum flow reversal distance, local pressure fluctuations for different initial upstream compressible volumes, channel dimension, locations of nucleation site, heat flux, and initial channel velocity for water and FC-72 at atmospheric pressure and R134a at 800 kPa.
Abstract: Pressure changes caused by the growth of confined bubbles during flow boiling in mini-/microchannels lead to transient flow reversal in the presence of inlet (upstream) compressibility. A one-dimensional (1-D) model is presented to study the effect of inlet resistance on maximum flow reversal distance, local pressure fluctuations for different initial upstream compressible volumes, channel dimension, locations of nucleation site, heat flux, and initial channel velocity for water and FC-72 at atmospheric pressure and R134a at 800 kPa. The two upstream compressibility models considered are condensable vapor in a subcooled boiling region and trapped noncondensable gas.
7 citations
01 Jan 2014
7 citations
01 Jan 2009
TL;DR: In this article, a simple 1-D model with low requirements for computing time is required to investigate parametric influences on the potentially adverse effects of pressure fluctuations driven by confined vapour bubble growth in microchannel evaporative cooling systems operating at high heat fluxes.
Abstract: A simple 1-D model with low requirements for computing time is required to investigate parametric influences on the potentially adverse effects of pressure fluctuations driven by confined vapour bubble growth in microchannel evaporative cooling systems operating at high heat fluxes. A model is developed in this paper for the particular conditions of a channel of rectangular cross-section with high aspect ratio with a constant inlet flow rate (zero upstream compressibility). (The model will later be extended to the conditions of finite upstream compressibility that lead to transient flow reversal). Some parametric trends predicted by the model are presented. The simplifying assumptions in the model are examined in the light of a 3-D simulation by a commercial CFD code, described in an accompanying paper by the same authors. The predictions of pressure changes are in reasonable agreement. It is suggested that the 1-D model will be a useful design tool.Copyright © 2009 by ASME
7 citations
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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
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
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
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
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