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Kuo Kuang Wu

Bio: Kuo Kuang Wu is an academic researcher from National Chiao Tung University. The author has contributed to research in topics: Combustion & Flame spread. The author has an hindex of 3, co-authored 3 publications receiving 125 citations. Previous affiliations of Kuo Kuang Wu include Industrial Technology Research Institute.

Papers
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Journal ArticleDOI
01 Sep 2010-Fuel
TL;DR: In this article, the influence of 21 − 30% oxygen concentration on the heating rate, emissions, temperature distributions, and fuel consumption in the heating and furnace-temperature fixing tests was investigated.

117 citations

Journal ArticleDOI
TL;DR: In this article, a numerical analysis using an unsteady combustion model is presented to study the ignition and subsequent downward flame spread over a thermally thin solid fuel in a gravitational field.
Abstract: A numerical analysis using an unsteady combustion model is presented to study the ignition and subsequent downward flame spread over a thermally thin solid fuel in a gravitational field. The solid-fuel temperature rises gradually in the heat-up stage and the pyrolysis becomes more intense. Ignition, including the induction period and thermal runaway, occurs as soon as a flammable mixture is formed and the gas-phase temperature, heated by the solid fuel, becomes high enough. During the induction period, the reactivity and temperature in the gas phase are mutually supportive. The thermal runaway consists of a burning premixed flame as the flow moves with the flame front. This is followed by a transition from a premixed flame into a diffusion flame. The flame front extends along and toward the upstream virgin fuel as the diffusion flame is formed. Finally, steady flame spread takes place as burnout appears. The ignition delay time is found to be controlled mainly by the time required to form the flammable mi...

17 citations

Journal ArticleDOI
TL;DR: In this article, the effects of radiation on a downward flame spread over a thermally thin solid fuel in a partial-gravity environment were explored, and the predicted quenching limit was shown to be close to the value obtained experimentally elsewhere.
Abstract: This study explores the effects of radiation on a downward flame spread over a thermally thin solid fuel in a partial-gravity environment. The radiation effect and gravitational field strength (g) are predicted not to influence the ignition delay time. The flame-spread rate reaches a maximum at g = 0.01. At g > 0.01, the flame stretch effect dominates the behaviors of the flame. Radiation heat transfer and oxygen transport control the flame behaviors for g < 0.01. The predicted quenching limit is g = 5 × 10−6, close to the value obtained experimentally elsewhere. Radiation has two simultaneous effects. One is to reduce the flame strength by carrying heat to the ambient. The other one is combined with upstream conduction to enhance the total forward heat transfer rate and thus preheat virgin fuel upstream. The solid fuel temperature is low and some fuel is left over in low gravity due to radiation loss. Energy analyses indicate that the conduction heat flux from the flame ( ) dominates its behaviors. Howev...

8 citations


Cited by
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Journal ArticleDOI
TL;DR: In this paper, the amplitude dependence of the flame response to inlet velocity forcing is investigated using turbulent combustion CFD and a modified laminar flamelet approach with an algebraic representation of flame surface density.

121 citations

Journal ArticleDOI
TL;DR: In this paper, the authors define the current technological factors that govern the field of application of polymeric membranes for the separation of air and discuss potential membrane materials, physical and chemical modifications of membranes for further research in this area.
Abstract: Separation of air to produce enriched nitrogen and oxygen has been of great significance to the chemical industry. Membrane-based gas permeation process has gained due importance over conventional methods such as cryogenic distillation, solid adsorption and solvent absorption, because it is economical, compact in size, modular in configuration and has the capacity to offer low specific power consumption. Typical applications of the membrane-produced nitrogen include blanketing, purging, inerting and underbalanced drilling, while the oxygen-enriched air is mainly used for combustion enhancement in furnaces, fuel cells, medical respiration and undersea breathing. Most membranes used in air separation are made of solid polymers. This review seeks to define the current technological factors that govern the field of application of polymeric membranes for the separation of air. Potential membrane materials, physical and chemical modifications of membranes for further research in this area are discussed.

109 citations

Journal ArticleDOI
15 Dec 2015-Energy
TL;DR: In this article, the combustion of NH 3 at oxygen enriched condition has been proposed as a novel method for improving NH 3 combustion, and the results show that O 2 -enriched combustion has positive effects on both laminar burning velocity and adiabatic flame temperature.

93 citations

Journal ArticleDOI
Weidong Fan1, Yu Li1, Qinghong Guo1, Chen Can, Wang Yong 
15 Apr 2017-Energy
TL;DR: In this paper, measurements of the major gas species and NOx profiles along the axial distance of a furnace were obtained in a 20kW down-fired pilot-scale combustion facility.

74 citations

Journal ArticleDOI
TL;DR: In this article, the authors compared polymer, inorganic, and polymer-inorganic composite materials and showed that most of the polymer membranes are suitable for production of low to moderate purity O2 and for high-purity N2.
Abstract: Abstract Compared with current conventional technologies, oxygen/nitrogen (O2/N2) separation using membrane offers numerous advantages, especially in terms of energy consumption, footprint, and capital cost. However, low product purity still becomes the major challenge for commercialization of membrane-based technologies. Therefore, numerous studies on membrane development have been conducted to improve both membrane properties and separation performance. Various materials have been developed to obtain membranes with high O2 permeability and high O2/N2 selectivity, including polymer, inorganic, and polymer-inorganic composite materials. The results showed that most of the polymer membranes are suitable for production of low to moderate purity O2 and for production of high-purity N2. Meanwhile, perovskite membrane can be used to produce a high-purity oxygen. Furthermore, the developments of O2/N2 separation using membrane broaden the applications of oxygen enrichment for oxy-combustion, gasification, desulfurization, and intensification of air oxidation reactions, while nitrogen enrichment is also important for manufacturing pressure-sensitive adhesive and storing and handling free-radical polymerization monomers.

58 citations