Tae-Ho Ko

In this paper we study the lift-off to equilibrium of a single circular particle in Newtonian and viscoelastic fluids by direct numerical simulation. A particle heavier than the fluid is driven forward on the bottom of a channel by a plane Poiseuille flow. After a certain critical Reynolds number, the particle rises from the wall to an equilibrium height at which the buoyant weight just balances the upward thrust from the hydrodynamic force. The aim of the calculation is the determination of the

Article on rate coefficients for the hydrogen atom + ammonia reaction over a wide temperature range.

Article on high-temperature photochemistry kinetics studies of the reactions of hydrogen atom(1²S) and deuterium atom (1²S) with nitrous oxide.

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh-temperature photochemistry kinetics study of the reaction hydrogen atom + nitrogen dioxide .fwdarw. hydroxyl + nitric oxide from 296 to 760 KTaeho Ko and Arthur FontijnCite this: J. Phys. Chem. 1991, 95, 10, 3984–3987Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Published inissue 1 May 1991https://pubs.acs.org/doi/10.1021/j100163a019https://doi.org/10.1021/j100163a019research-articleACS PublicationsRequest reuse

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the atomic oxygen(3P) + benzene reaction over a wide temperature rangeTaeho Ko, George Yaw Adusei, and Arthur FontijnCite this: J. Phys. Chem. 1991, 95, 22, 8745–8748Publication Date (Print):October 1, 1991Publication History Published online1 May 2002Published inissue 1 October 1991https://pubs.acs.org/doi/10.1021/j100175a060https://doi.org/10.1021/j100175a060research-articleACS PublicationsRequest reuse permissionsArticle Views127Altmetri

Choi & Joseph (2001) reported a two-dimensional numerical investigation of the lift-off of 300 circular particles in plane Poiseuille flows of Newtonian fluids. We perform similar simulations. Particles heavier than the fluid are initially placed in a closely packed ordered configuration at the bottom of a periodic channel. The fluid–particle mixture is driven by an external pressure gradient. The particles are suspended or fluidized by lift forces that balance the buoyant weight perpendicul

Alzheimer's disease (AD) is an ageing-related neurodegenerative disease characterized and diagnosed by deposition of insoluble amyloid-β (Aβ) plaques in the brain. The plaque accumulation in the brain directly affects reduced levels of Aβ in cerebrospinal fluid (CSF) and blood, as Aβ can freely transport the blood-brain barrier, and clinical investigations have suggested these two biofluids as promising samples for in vitro diagnosis. Given that the human eye structurally resembles the brain and

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFlow-tube kinetics study of the reaction between ground-state hydrogen atoms and nitromethaneTaeho Ko, William F. Flaherty, and Arthur FontijnCite this: J. Phys. Chem. 1991, 95, 18, 6967–6970Publication Date (Print):September 1, 1991Publication History Published online1 May 2002Published inissue 1 September 1991https://doi.org/10.1021/j100171a044RIGHTS & PERMISSIONSArticle Views34Altmetric-Citations7LEARN ABOUT THESE METRICSArticle Views are the COUNTE

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the reactions between atomic oxygen (3P) and 1-butene from 335 to 1110 KTaeho Ko, George Yaw Adusei, and Arthur FontijnCite this: J. Phys. Chem. 1991, 95, 23, 9366–9370Publication Date (Print):November 1, 1991Publication History Published online1 May 2002Published inissue 1 November 1991https://pubs.acs.org/doi/10.1021/j100176a060https://doi.org/10.1021/j100176a060research-articleACS PublicationsRequest reuse permissionsArticle Views56Altme

ABSTRACT A program aiming at predicting dynamic characteristics of a Liquid Rocket Engine(LRE) was developed and examined to trace entire LRE operation. In the st artup period, transient characteristics of the propellant flows were predicted and validated with hydraulic tests data. An arrangement of each component for the pipelines was based on an operating circuit of open cycle LRE. The flow rate ratio for the gas generator and the main chamber was determined to mimic that of real open cycle LR

Rate coefficients for the H + NO2 yields OH + NO reaction have been measured by using the high-temperature photochemistry (HTP) technique. H atoms are generated by flash photolysis of CH4, and their relative concentration is monitored by time-resolved resonance-fluorescence detection. The data are well-fitted by the empirical expression k(T) = 2.2 X 10-10 exp(-182 K/T) cm3/molecule for the 296-760 K temperature range. The precision of the data is 7%, and the accuracy is estimated to be 21%, wher