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, an experimental investigation of the sensitivity of the vanadium redox flow battery (VRFB) to the cell operating temperature was carried out on a VRFB cell with an active area of 426 cm2, at cell temperatures of 25, +10 and −10
17 citations
TL;DR: In this article, the origins of the discrepancy between the solution obtained using the extended Stokes series method of M. Van Dyke and that obtained using other theoretical, experimental and numerical techniques for the friction factor ratio in coiled tubes in laminar flow are investigated in the light of new numerical evidence.
Abstract: In this paper, the origins of the discrepancy between the solution obtained using the extended Stokes series method of M. Van Dyke and that obtained using other theoretical, experimental and numerical techniques for the friction factor ratio in coiled tubes in laminar flow are investigated in the light of new numerical evidence. It is suggested that the cause of the discrepancy lies in the use of only the first 12 terms in the Stokes series to determine its analytic structure for all Dean numbers.
16 citations
TL;DR: The study shows that a cross-flow Peclet number of the order of 2 is required for effective removal of water from the GDL, making these areas prone to flooding not usually produced in the U-bends of Serpentine flow fields.
Abstract: Adoption of hydrogen economy by means of using hydrogen fuel cells is one possible solution for energy crisis and climate change issues. Polymer electrolyte membrane (PEM) fuel cell, which is an important type of fuel cells, suffers from the problem of water management. Cross-flow is induced in some flow field designs to enhance the water removal. The presence of cross-flow in the serpentine and interdigitated flow fields makes them more effective in proper distribution of the reactants on the reaction layer and evacuation of water from the reaction layer than diffusion-based conventional parallel flow fields. However, too much of cross-flow leads to flow maldistribution in the channels, higher pressure drop, and membrane dehydration. In this study, an attempt has been made to quantify the amount of cross-flow required for effective distribution of reactants and removal of water in the gas diffusion layer. Unit cells containing two adjacent channels with gas diffusion layer (GDL) and catalyst layer at the bottom have been considered for the parallel, interdigitated, and serpentine flow patterns. Computational fluid dynamics-based simulations are carried out to study the reactant transport in under-the-rib area with cross-flow in the GDL. A new criterion based on the Peclet number is presented as a quantitative measure of cross-flow in the GDL. The study shows that a cross-flow Peclet number of the order of 2 is required for effective removal of water from the GDL. Estimates show that this much of cross-flow is not usually produced in the U-bends of Serpentine flow fields, making these areas prone to flooding.
16 citations
TL;DR: In this article, the authors present a modeling framework for the simulation of hydrodynamic features of a liquid solid circulating fluidized bed (LSCFB) using computational fluid dynamics (CFD) using an Eulerian-Eulerian approach to deal with the two-phase flow aspects and the kinetic theory of granular flow (KTGF) approach to handle the solid-fluid interaction.
16 citations
TL;DR: It is shown that a combination of steadily-operated compact ethanol reformer, a low-power battery continuously charged by excess reformer capacity and a high-power fuel cell powered by conservatively-used hydrogen from cylinder can increase the range of hybrid fuel cell drivetrains to about 750 km.
16 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