Oxy-fuel combustion of pulverized coal: Characterization, fundamentals, stabilization and CFD modeling

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.

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Ammonia as a possible element in an energy infrastructure: catalysts for ammonia decomposition

Review: Direct ethanol fuel cells

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.

A review of flow and heat transfer characteristics in curved tubes

A review of high-temperature proton exchange membrane fuel cell (HT-PEMFC) system

Flow apportionment algorithm for optimization of power plant ducting

Auto-ignition temperature and burning rate of potassium pool fire in a confined enclosure

The case of an oscillating manometer with variable density and dissipation: experimental and numerical study

Experimental studies of permeability measurement and hydrodynamics study of all-Vanadium redox flow battery

The classical problem of Taylor-Couette flow between rotating concentric cylinders under laminar flow conditions is studied using computational fluid dynamics (CFD) techniques. The flow between concentric cylinders with the inner cylinder rotating and the outer cylinder stationary for a Newtonian fluid has been calculated for a range of Reynolds numbers, radius ratios, length to diameter ratios using the CFD code CFX. The predicted tangential velocity profiles have been found to agree well with analytical profiles in the Couette flow regime and the transition from Couette flow to Taylor vortex flow has also been correctly predicted. Results for the power number show that it varies inversely with Reynolds number in the Couette flow regime and as Re -n where n ~ 0.7 in the Taylor vortex flow. These results agree well with the experimental data of Sinevic et al (1). A new correlation is proposed to calculate the power number for the Couette flow and the Taylor vortex flow regimes.

http://wseas.us/e-library/conferences/2005corfu/c2/papers/530-147.pdf

Sreenivas Jayanti

Papers

Flow apportionment algorithm for optimization of power plant ducting

Auto-ignition temperature and burning rate of potassium pool fire in a confined enclosure

The case of an oscillating manometer with variable density and dissipation: experimental and numerical study

Experimental studies of permeability measurement and hydrodynamics study of all-Vanadium redox flow battery

Power Number Calculations for a Taylor-Couette Flow