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Numerical Heat Transfer And Fluid Flow

MHD enhanced nanofluid mediated heat transfer in porous metal for CPU cooling

An improved chemical kinetic model for the toluene oxidation based on experimental data obtained in a premixed laminar low-pressure flame with vacuum ultraviolet (VUV) photoionization and molecular beam mass spectrometry (MBMS) techniques has been proposed. The present mechanism consists of 273 species up to chrysene and 1740 reactions. The rate constants of reactions of toluene, decomposition, reaction with oxygen, ipso-additions and metatheses with abstraction of phenylic H-atom are updated; new pathways of C{sub 4} + C{sub 2} species giving benzene and fulvene are added. Based on the experimental observations, combustion intermediates such as fulvenallene, naphtol, methylnaphthalene, acenaphthylene, 2-ethynylnaphthalene, phenanthrene, anthracene, 1-methylphenanthrene, pyrene and chrysene are involved in the present mechanism. The final toluene model leads to an overall satisfactory agreement between the experimentally observed and predicted mole fraction profiles for the major products and most combustion intermediates. The toluene depletion is governed by metathese giving benzyl radicals, ipso-addition forming benzene and metatheses leading to C{sub 6}H{sub 4}CH{sub 3} radicals. A sensitivity analysis indicates that the unimolecular decomposition via the cleavage of a C-H bond has a strong inhibiting effect, while decomposition via C-C bond breaking, ipso-addition of H-atom to toluene, decomposition of benzyl radicals and reactions related to C{sub 6}H{sub 4}CH{sub 3} radicals have promoting effect for the consumption of toluene. Moreover, flow rate analysis is performed to illustrate the formation pathways of mono- and polycyclic aromatics.

/pdf/a-detailed-kinetic-modeling-study-of-toluene-oxidation-in-a-4rlmq6rf90.pdf

A detailed kinetic modeling study of toluene oxidation in a premixed laminar flame

Eccentricity effects of heat source inside a porous annulus on the natural convection heat transfer and entropy generation of Cu-water nanofluid

Thermal optimization of shell and tube heat exchanger using porous baffles

Potentials of porous materials for energy management in heat exchangers – A comprehensive review

There has been considerable progress in the area of fuel surrogate development to emulate gasoline fuels’ oxidation properties. The current paper aims to review the relevant hydrocarbon group components used for the formulation of gasoline surrogates, review specific gasoline surrogates reported in the literature, outlining their utility and deficiencies, and identify the future research needs in the area of gasoline surrogates and kinetics model.

/pdf/review-of-oxidation-of-gasoline-surrogates-and-its-57n710nyti.pdf

Review of Oxidation of Gasoline Surrogates and Its Components

A new detailed kinetic model of ethanol with 107 species and 1795 reactions was developed using a reaction mechanism generator and extensively validated against measured ignition delay times, lamin...

Ethanol Kinetic Model Development and Validation at Wide Ranges of Mixture Temperatures, Pressures, and Equivalence Ratios

Thermal performance and entropy generation are studied for water in a square heat exchanger duct equipped with several transverse twisted baffles to obtain optimal working condition. The influences...

Effect of Transverse Twisted Baffles on Performance and Irreversibilities in a Duct

The autoignition process of different propane mixtures was studied to determine how the diluent choice (helium and argon/nitrogen) affects the ignition delay, the production of excited radicals, and the overall combustion process. An optically accessible rapid compression machine, high-speed camera, flame spectrometer, and numerical model were used to investigate the combustion process. The ignition delay times were measured at a wide range of compressed gas temperatures from 860 to 950 K, a compressed gas pressure of approximately 34 bar, and two equivalence ratios of 1.0 and 1.5. Chemiluminescence at wavelengths of 309, 555, 590, and 623 nm from the decay of excited radicals was detected during the autoignition process, and their respective intensities were measured and compared at various test conditions. A new kinetic model was built by combining reaction rates of excited radicals and species from the literature. The new model was validated against the measured ignition delay data of this work. The ig...

O. Samimi-Abianeh

Papers

Potentials of porous materials for energy management in heat exchangers – A comprehensive review

Review of Oxidation of Gasoline Surrogates and Its Components

Ethanol Kinetic Model Development and Validation at Wide Ranges of Mixture Temperatures, Pressures, and Equivalence Ratios

Effect of Transverse Twisted Baffles on Performance and Irreversibilities in a Duct

Effect of Diluents on the Autoignition of Propane Mixtures Using a Rapid Compression Machine