Author
Sreenivas Jayanti
Other affiliations: Ohio State University, Imperial College London, Indian Institutes of Technology
Bio: Sreenivas Jayanti is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Pressure drop & Combustion. The author has an hindex of 37, co-authored 142 publications receiving 3884 citations. Previous affiliations of Sreenivas Jayanti include Ohio State University & Imperial College London.
Topics: Pressure drop, Combustion, Two-phase flow, Coal, Flow battery
Papers published on a yearly basis
Papers
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TL;DR: In this paper, a set of closure relations for the prediction of dryout and post-dryout heat transfer at high pressure (P / P cr >03) conditions is presented for a one-dimensional three-fluid model.
63 citations
TL;DR: In this article, the CFDS-FLOW3D computational fluid dynamics code is used to determine the force exerted on a standing wave by gas flowing over it, and it is found that the drag on the wave is mainly due to the pressure variation around it and that it is a strong function of the channel dimensions.
62 citations
TL;DR: In this paper, the authors classified the dryout data into three groups: stratification-, redeposition-dominated and entrainment-dominated dryout, and developed transition criteria for these zones in a dryout map.
61 citations
TL;DR: In this paper, the effect of oscillations on the heat transfer in a vertical tube has been studied experimentally and an expression has been proposed to calculate the mean Nusselt number as a function of the tube length.
Abstract: The effect of oscillations on the heat transfer in a vertical tube has been studied experimentally. A vertical tube was mounted on a plate and the whole plate was subjected to oscillations in the vertical plane using a mechanical oscillator to provide low frequency oscillations. A section of the tube in the middle is subjected to a constant heat flux. The effect of the oscillations on the heat transfer coefficient has been examined. It was found that the heat transfer coefficient increased with oscillations in the laminar regime. In turbulent flow regime (Re > 2,100) it is found that the effect of oscillations did not show any change. A correlation has been developed for enhancement of the local Nusselt number in terms of the effective acceleration and Reynolds number. Using this, an expression has been proposed to calculate the mean Nusselt number as a function of the tube length.
60 citations
TL;DR: In this paper, the growth of three-dimensional cavity geometries in underground coal gasification has been simulated using experiments carried out in three configurations: (i) sublimation experiments in camphor simulating primarily the heat transfer aspects, (ii) bore hole combustion in Acacia nilotica wood bringing in chemical reaction into play, and (iii) borehole combustion a coal block bringing into consideration the effect of ash on the cavity formation.
59 citations
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TL;DR: Oxy-coal combustion has generated significant interest since it was proposed as a carbon capture technology for newly built and retrofitted coal-fired power plants, and numerical models for sub-processes are also used to examine the differences between combustion in an oxidizing stream diluted by nitrogen and carbon dioxide as mentioned in this paper.
866 citations
TL;DR: The role of ammonia in future energy infrastructure is discussed in this article, where the authors focus on the catalytic decomposition of ammonia as a key step and highlight other aspects such as catalytic removal of ammonia from gasification product gas or direct ammonia fuel cells.
Abstract: The possible role of ammonia in a future energy infrastructure is discussed. The review is focused on the catalytic decomposition of ammonia as a key step. Other aspects, such as the catalytic removal of ammonia from gasification product gas or direct ammonia fuel cells, are highlighted as well. The more general question of the integration of ammonia in an infrastructure is also covered.
495 citations
TL;DR: In this paper, the challenges and the developments of direct ethanol fuel cells at present are addressed and the applications of DEFC are presented, as well as the challenges that need to be addressed.
461 citations
TL;DR: In this paper, a literature review on heat transfer and flow characteristics of single-phase and two-phase flow in curved tubes is presented, where three main categories of curved tubes; helically coiled tubes, spirally coiling tubes, and other coiled tube, are described.
Abstract: The performance of heat exchangers can be improved to perform a certain heat-transfer duty by heat transfer enhancement techniques. In general, these techniques can be divided into two groups: active and passive techniques. The active techniques require external forces, e.g. electric field, acoustic or surface vibration, etc. The passive techniques require fluid additives or special surface geometries. Curved tubes have been used as one of the passive heat transfer enhancement techniques and are the most widely used tubes in several heat transfer applications. This article provides a literature review on heat transfer and flow characteristics of single-phase and two-phase flow in curved tubes. Three main categories of curved tubes; helically coiled tubes, spirally coiled tubes, and other coiled tubes, are described. A review of published relevant correlations of single-phase heat transfer coefficients and single-phase, two-phase friction factors are presented.
441 citations
TL;DR: In this article, the authors provided information encompassing the recent discovery of the High Temperature Proton Exchange Membrane Fuel Cell (HT-PEMFC) focusing on systems requirement.
419 citations