in this study, aluminum (al) matrix reinforced with micro-particles (30 µm) and nano-particles (50 nm) boron carbide (b4c) were used to prepare al-2.5%wt., b4c nano-composite and micro-composite, respectively, using mechanical alloying method. the mixed powders were mechanically milled at 5, 10, 15 and 20 hrs. the xrd results indicated that the crystallite sizes of both the micro-composite and ...

Modifications to a stochastic differential equation (SDE) approach for modeling single and two phase NAPL flow are proposed which are intended to allow SDE modeling of the motion of air bubbles in porous media. Bubble flow and channeling are discussed along with bubble sticking, bubble coalescing, bubble breakup and air sparging.

OBJECTIVE To test the hypothesis whether enriched air nitrox (EAN) breathing during simulated diving reduces decompression stress when compared to compressed air breathing as assessed by intravascular bubble formation after decompression. METHODS Human volunteers underwent a first simulated dive breathing compressed air to include subjects prone to post-decompression venous gas bubbling. Twel...

in this research, the effect of micro turbulence on the flotation rate of quartz particles was investigated. the maximum particle reynolds number (rep) was obtained at 60.25 with a particle size of -500+420 µm, impeller speed of 900 rpm, bubble surface area flux of 10.21 1/s and micro scale turbulence size of 162 µm. when the micro turbulence size was equal to the particle size, the maximum flo...

Attachment of particles and droplets to bubbles—the latter being various fine sizes created by different techniques (as described in detail)—forms the basis flotation, a process which indeed was originated from mineral processing. Nevertheless, chemistry often plays significant role this area, order for separation be effective, as stressed. This (brief) review particularly discusses wastewater ...

We present in this paper a simple method to produce strategic acoustic particle capture sites microfluidic channels controlled way. Air bubbles are intermittently injected into micro-capillary with rectangular cross section during flow motion of liquid suspensions containing micron-sized particles or create bubble-defined “micro-gaps” size close 200 µm and spheroidal geometry. The establishment...

Advances in the apptication of supercritical (SC), gaseous (G), and ]iquid (LQ) C02 hayc been made regarding the interaction with biological materials or organisms. There are sevcral reports dealing with the influences of SC, G, and LQ C02 on proteins,i'2) amino acids,i) enzymes,3'S) and microbial eells.b'7) Kamihara et aL have described that wet cells (water content of 70-90g,h) of baker's yea...