Papers by Keyword: Gas Bubbling

Abstract: The present study aims at evaluating the gas bubbling method, based on the use of dry air as a gaseous phase, for the production of Al based metal matrix nanocomposites through a proper gas-liquid reaction. In particular, Al₂O₃ reinforcement particles were in-situ synthesized in molten commercially pure Al through a gas bubbling oxidation technique. Dry air was injected in the melt in order to induce a controlled oxidation of the molten matrix. SEM-EDS analysis on the produced samples revealed the presence of alumina particles, ranging from the nanoto the micrometric size, demonstrating the feasibility of the process. A hardness increase on the produced samples confirmed the strengthening effect of the in-situ produced ceramic particles.

Abstract: Because of a great many of advantages with gas hydrate slurry, it can be widely used in air-conditioning system as a candidate of conventional secondary refrigerants. In this paper, three methods of producing gas hydrate slurry expressed as continuous stirring, water spraying and gas bubbling are introduced and the characteristics are discussed. The progresses of hydrate slurry at home and abroad is also presented briefly.