Joongyeon Kim

Excess enthalpy and vapor–liquid equilibrium prediction using non-random lattice fluid equation of state

Abstract Although an equation of state can be applied to volumetric properties, phase equilibria and excess enthalpy calculations, few studies have been published for a unified approach. This study presents the consistent application of lattice fluid model of You et al. Using pure component parameters fitted to saturation densities and vapor pressures, binary interaction parameters were determined. The binary parameter was found to be more sensitive to enthalpy. A linear temperature dependence of this parameter was found adequate. The method yields good results except for polar–nonpolar mixtures. For these systems, errors in vapor–liquid equilibria appear to be magnified.

Heat Sink Measurement of Liquid Fuel for High Speed Aircraft Cooling

For hypersonic aircraft, increase of flight speeds causes heat loads that are from aerodynamic heat and engine heat. The heat loads could lead structural change of aircrafts component and malfunctioning. Endothermic fuels are liquid hydrocarbon fuels which are able to absorb the heat loads by undergoing endothermic reactions, such as thermal and catalytic cracking. In this study, methylcyclohexane was selected as a model endothermic fuel and experiments on endothermic properties were implemented. To improve heat of endothermic reaction, we applied zeolites and confirmed that HZSM-5 was the best catalyst for the catalytic performance. The objective is to investigate catalyti c effects for heat sink improvement. The catalyst could be applied to system that use kerosene fuel as endothermic fuel.

Improvement of Heat of Reaction of Jet Fuel Using Pore Structure Controlled Zeolite Catalyst

In hypersonic aircraft, increase of aerodynamic heat and engine heat leads heat loads in airframe. It could lead structural change of aircraft’s component and malfunctioning. Endothermic fuels are liquid hydrocarbon fuels which are able to absorb the heat load by undergoing endothermic reactions. In this study, exo-tetrahydrodicyclopentadiene was selected as a model endothermic fuel and experiments on endothermic properties were investigated with pore structure controlled zeolite catalyst using metal deposition. We secured the catalyst that had better endothermic performance than commercial catalyst. The object of this study is inspect catalyst properties which have effect on heat absorption improvement. Synthetic catalyst could be applied to system that use exo-THDCP as endothermic fuel instead of other commercial catalyst.